- discuss - lists.mariadb.org

[Maria-discuss] Character set & BLOBS on MySQL
by Andrew Wood 08 Nov '18

08 Nov '18

I am in the process of moving some tables from MySQL 5.1 (Linux) MariaDB 10.1 also on Linux. One of the tables stores binary data (either a PDF or JPEG) as a LONGBLOB. The code that reads & writes to the table is PHP and hasnt changed other than having the url of the database server altered. No errors are thrown on reading or writing but JPEGs are coming out corrupted, where as PDFs show fine. I had a hunch it was due to the charset/collation settings even though both tables are identical (the new one was created with the output from mysqldump on the old server). Having run SHOW SESSION VARIABLES LIKE 'character\_set\_%'; on both the old and new server there is a difference but I want to understand why this might be causing the problem before I alter anything. New server: MariaDB [(none)]> SHOW SESSION VARIABLES LIKE 'character\_set\_%'; +------------------------------------+-------------+ | Variable_name | Value | +------------------------------------+-------------+ | character_set_client | utf8mb4 | | character_set_connection | utf8mb4 | | character_set_database | utf8mb4 | | character_set_filesystem | binary | | character_set_results | utf8mb4 | | character_set_server | utf8mb4 | | character_set_system | utf8 | +------------------------------------+-------------+ 7 rows in set (0.00 sec) Old server: mysql> SHOW SESSION VARIABLES LIKE 'character\_set\_%'; +------------------------------------+----------+ | Variable_name | Value | +------------------------------------+----------+ | character_set_client | latin1 | | character_set_connection | latin1| | character_set_database | utf8 | | character_set_filesystem | binary| | character_set_results | latin1 | | character_set_server | latin1 | | character_set_system | utf8 | +------------------------------------+---------+ 7 rows in set (0.00 sec) Also is there a way for the client to specify the correct settings for reading/writing BLOBS on a per connection basis as it might not always be possible to alter the server? Thanks

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[Maria-discuss] account locking?
by Felipe Gasper 05 Nov '18

05 Nov '18

Hello, Does the MariaDB development team intend to add account locking? I don’t see it in the 10.4 roadmap. MySQL added this in 5.7.6. Previously we’d accomplished this by reversing the password hash; for our servers that run MariaDB it would be great to be able to use the same facility. Thank you! -Felipe Gasper

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[Maria-discuss] wsrep_node_incoming_address not honoured?
by George Diamantopoulos 02 Nov '18

02 Nov '18

Hello all, I've setup a galera cluster with 3 nodes, and I believe that wsrep_node_incoming_address is not honoured when set in the configuration. More specifically, the setting persists in mariadb: +-----------------------------+---------------+ | Variable_name | Value | +-----------------------------+---------------+ | bind_address | 172.30.20.1 | | wsrep_node_address | 172.30.20.129 | | wsrep_node_incoming_address | 172.30.20.129 | | wsrep_sst_receive_address | 172.30.20.129 | +-----------------------------+---------------+ But the process listens on all interfaces instead: root@gal0-cn1:~# netstat -plunt | grep mysql tcp 0 0 172.30.20.1:3306 0.0.0.0:* LISTEN 17229/mysqld tcp 0 0 0.0.0.0:4567 0.0.0.0:* LISTEN 17229/mysqld Is this expected behaviour? Shouldn't mysqld only listen on 172.30.20.129:4567, as configured? Thanks! BR, George

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[Maria-discuss] Modify Global Variable "open_files_limit" not working
by c.monty＠web.de 02 Nov '18

02 Nov '18

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[Maria-discuss] adding syslog crashes container
by Paul Chubb 30 Oct '18

30 Oct '18

hi I am trying to get Mariadb to log to syslog - this is for log consolidation etc. I am using Maria in a docker container from docker hub. Other things from the container are successfully logging to syslog on my logging server but Maria isn't. If I add the word 'syslog' to a [mysqld_safe] section the configuration is not read (as reported by mysqld --print-defaults). The container init script calls mysqld rather than mysqld_safe If I change the init script to call mysqld_safe instead of mysqld, syslog is set as reported by --print-defaults however the container continually crashes after restart. If I add the word 'syslog' to [mysqld] the configuration is read however after restart, mariadb continually crashes - at least the container does. I have checked for log-error statements, when checking global vars log_error is empty and it is not reported on the print-defaults output. If I setup to log to a file, this works fine. The container is running Ubuntu 18.04 Mariadb version is 10.3.10 rsyslog version is kinetic 8.32.0 Not sure what you want to see to help me, advise and I will do my best to give it to you. Cheers paul

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[Maria-discuss] Secure replication with mariadb
by Danishka Navin 26 Oct '18

26 Oct '18

Hi Team, I am working on deploying moodle (using mariadb) in over 1000 centers and connect each remote center with central server. Each remote center has no identical data as users are totally different. (But same type of data across these 1000 remote center nodes). We can not gurrenty the connectivity between remote server and centralized server in all 1000 nodes (some of the remote servers may have connectivity issues but we need to recover all data once the connectivity establish). Is it possible to replicate each remote server in to single central server over TLS? or do we have better solution? Regards, Danishka

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[Maria-discuss] My Solution to MariaDB Database Server Crashed in Experimental Online Store
by Turritopsis Dohrnii Teo En Ming 23 Oct '18

23 Oct '18

Good evening from Singapore, Here is my solution: # systemctl start mariadb.service # mysql Welcome to the MariaDB monitor. Commands end with ; or \g. Your MariaDB connection id is 2 Server version: 5.5.60-MariaDB MariaDB Server Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. MariaDB [(none)]> quit Bye # systemctl enable mariadb.service ===BEGIN SIGNATURE=== Turritopsis Dohrnii Teo En Ming's Academic Qualifications as at 30 Oct 2017 [1] https://tdtemcerts.wordpress.com/ [2] http://tdtemcerts.blogspot.sg/ [3] https://www.scribd.com/user/270125049/Teo-En-Ming ===END SIGNATURE===

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[Maria-discuss] aws key management plugin
by Paul Chubb 19 Oct '18

19 Oct '18

Hi, on the repo there only seems to be copies of this for Ubuntu yacketty (16.10) and Ubuntu zesty (17.04). Both of these are end of life. Is there supposed to be support for Bionic (18.04)? Secondly, they are tagged with the mariadb version number. Are they supposed to work across versions because not every version of Mariadb is represented? Thirdly is there any reason I can't pull the code from Gidhub and compile it myself? Many thanks in advance Paul

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[Maria-discuss] help
by Paul Chubb 18 Oct '18

18 Oct '18

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[Maria-discuss] gtid_slave_pos row count
by Reinis Rozitis 15 Oct '18

15 Oct '18

Hi, before considering this as a bug wanted to ask in mailing list: I know that gtid_slave_pos table can have multiple entries, but (at least on 10.3.9 but maybe also earlier (just noticed now)) while running: slave_parallel_threads = 20 slave_parallel_mode = optimistic the table starts to grow continuously: MariaDB [mysql]> select count(*) from gtid_slave_pos; +----------+ | count(*) | +----------+ | 5577268 | +----------+ 1 row in set (1.553 sec) If I switch back to conservative mode it never goes above 2-3 rows even with the same 20 threads. Same happens also with gtid_pos_auto_engines - when in conservative each engine table has several records, once I switch to optimistic the gtid tables just grow. Is there something wrong with the purger? (something similar like in https://jira.mariadb.org/browse/MDEV-12147 ? ) rr

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[Maria-discuss] MariaDB 10.3 and largepages on Linux
by Kenneth Penza 12 Oct '18

12 Oct '18

Good morning, I am currently running RHEL 7.5 and MariaDB 10.3.9. After setting "large_pages=on" I noticed that MariaDB is reporting an error on startup and shutdown as per below output. To use large pages I modified /etc/sysctl.conf, /etc/security/limits.conf and the systemd unit file. By monitoring /proc/meminfo I verified that largepage are being used. Configuration: mysqld would have been started with the following arguments: --port=3306 --socket=/var/lib/mysql/mysql.sock --thread_stack=256K --large_pages=on --key_buffer_size=16K --max_allowed_packet=512M --table_open_cache=32 --sort_buffer_size=512K --net_buffer_length=8K --read_buffer_size=256K --read_rnd_buffer_size=256K --slow_query_log=1 --slow_query_log_file=mysql-slow.log --long_query_time=0.1 --log-queries-not-using-indexes=on --thread_handling=pool-of-threads --thread_pool_idle_timeout=60 --thread_pool_max_threads=1000 --thread_pool_size=8 --innodb_buffer_pool_size=256M --innodb_strict_mode=1 --innodb_file_per_table=1 --innodb_flush_method=O_DIRECT --innodb_log_files_in_group=4 --innodb_log_file_size=50331648 --innodb_undo_logs=128 --innodb_undo_tablespaces=8 --slow_query_log=1 --slow_query_log_file=mysql-slow.log --long_query_time=30 --log-queries-not-using-indexes=off --log_bin=mariadblog --binlog_format=ROW --binlog_row_image=MINIMAL --max_binlog_size=10240000 --expire_logs_days=1 --server-id=1 --innodb_flush_log_at_trx_commit=1 --sync_binlog=1 --relay-log=mariadb-relay-bin --performance_schema=off --histogram_size=255 --histogram_type=SINGLE_PREC_HB --use_stat_tables=preferably --optimizer_use_condition_selectivity=4 Startup messages: Sep 25 10:40:53 srv1 mysqld: 2018-09-25 10:40:52 0 [Note] InnoDB: Opened 8 undo tablespaces Sep 25 10:40:53 srv1 mysqld: 2018-09-25 10:40:53 0 [Warning] InnoDB: Failed to set memory to DODUMP: Invalid argument ptr 0x2aaac5400000 size 2097152 Sep 25 10:40:53 srv1 mysqld: 2018-09-25 10:40:53 0 [Note] InnoDB: 128 out of 128 rollback segments in 8 undo tablespaces are active. Shutdown messages: Sep 25 10:41:18 srv1 mysqld: 2018-09-25 10:41:18 0 [Note] InnoDB: Buffer pool(s) dump completed at 180925 10:41:18 Sep 25 10:41:19 srv1 mysqld: 2018-09-25 10:41:19 0 [Warning] InnoDB: Failed to set memory to DODUMP: Invalid argument ptr 0x2aaac3400000 size 33554432 Sep 25 10:41:19 srv1 mysqld: 2018-09-25 10:41:19 0 [Note] InnoDB: Shutdown completed; log sequence number 1522725; transaction id 22 Do you have ideas on what is causing "InnoDB: Failed to set memory to DODUMP: Invalid argument ptr .. " warning? Kenneth

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[Maria-discuss] CONC-312; caching_sha2_plugin
by Michal Schorm 02 Oct '18

02 Oct '18

Hello, Can I get some explanation, why was https://jira.mariadb.org/browse/CONC-312 closed as WON'T FIX ? -- MySQL 8.0 implemented "caching_sha2_password" as its default authentification plugin / method. MariaDB doesn't have support for it so mariadb-connector-c cannot be used for MySQL 8. That makes problems for nearly every Linux OS, beacuse they chose MariaDB over MySQL as the default implemetation. I'd like to know the MariaDB stance to it. Do you see it as an issue as well? Are there any plans to deal with it? How? Michal Schorm -- Michal Schorm Associate Software Engineer Core Services - Databases Team Red Hat

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[Maria-discuss] Step-by-Step Tutorial: How to Setup Your Own e-Commerce Online Store using WooCommerce 3.4.5, Wordpress 4.9.8, and CentOS 1805 (LAMP) in Amazon AWS Cloud
by Turritopsis Dohrnii Teo En Ming 29 Sep '18

29 Sep '18

Good morning from Singapore, You can read my step-by-step tutorial on How to Setup Your Own e-Commerce Online Store using WooCommerce 3.4.5, Wordpress 4.9.8, and CentOS 1805 (LAMP) in Amazon AWS Cloud at any one of my two redundant blogs. My blogs were configured in RAID 1 mirroring array. https://tdtemcerts.wordpress.com/2018/09/29/step-by-step-tutorial-how-to-se… https://tdtemcerts.blogspot.com/2018/09/step-by-step-tutorial-how-to-setup-… Thanks for reading! If there are any mistakes, please do let me know! ===BEGIN SIGNATURE=== Turritopsis Dohrnii Teo En Ming's Academic Qualifications as at 30 Oct 2017 [1] https://tdtemcerts.wordpress.com/ <https://tdtemcerts.wordpress.com/>[2] http://tdtemcerts.blogspot.sg/ <http://tdtemcerts.blogspot.sg/>[3] https://www.scribd.com/user/270125049/Teo-En-Ming <https://www.scribd.com/user/270125049/Teo-En-Ming>===END SIGNATURE===

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Re: [Maria-discuss] MariaDB 10.3 and largepages on Linux
by Kenneth Penza 26 Sep '18

26 Sep '18

Good morning, Thanks for the clarification. Yes sure, below please find the requested output. If you prefer I can open a JIRA ticket to facilitate tracking. $ cat /proc/sys/vm/nr_hugepages 512 $ uname -a Linux srv1 3.10.0-862.11.6.el7.x86_64 #1 SMP Fri Aug 10 16:55:11 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux $ grep ^Huge /proc/meminfo HugePages_Total: 512 HugePages_Free: 467 HugePages_Rsvd: 167 HugePages_Surp: 0 Hugepagesize: 2048 kB $ grep mysql /etc/security/limits.conf mysql soft memlock 2621440 mysql hard memlock 2621440 $ grep AnonHugePages /proc/meminfo AnonHugePages: 6144 kB $ cat /etc/sysctl.d/99-mysql.conf vm.hugetlb_shm_group = 27 vm.nr_hugepages = 512 vm.swappiness = 10 fs.aio-max-nr = 500000 $ I have also added, "LimitMEMLOCK=2147483648" in systemd file. Kenneth On Wed, Sep 26, 2018 at 1:01 AM Daniel Black <daniel(a)linux.ibm.com> wrote: > On Tue, 25 Sep 2018 10:48:01 +0200 > Kenneth Penza <kpenza(a)gmail.com> wrote: > > > Good morning, > > > Good morning, > > Thanks for the detailed bug report. As the contributor of this feature > I'm happy to try to work this out. First I'll reassure you that the > WARNING is simply that, there's no negative impacts form this apart > from any unexpected core dump will include the large pages as it failed > to to mark them as don't dump. > > A couple of small clarifying questions to start: > > Do you have THP enabled? > $ cat /proc/sys/vm/nr_hugepages > > What kernel version / architecture? > $ uname -a > > What huge page size / current allocation is available? > > $ grep ^Huge /proc/meminfo > > > > I am currently running RHEL 7.5 and MariaDB 10.3.9. After setting > > "large_pages=on" I noticed that MariaDB is reporting an error on > > startup and shutdown as per below output. > > > > To use large pages I > > modified /etc/sysctl.conf, /etc/security/limits.conf and the systemd > > unit file. By monitoring /proc/meminfo I verified that largepage are > > being used. > > > > Configuration: > > > > mysqld would have been started with the following arguments: > > --port=3306 --socket=/var/lib/mysql/mysql.sock --thread_stack=256K > > --large_pages=on --key_buffer_size=16K --max_allowed_packet=512M > > --table_open_cache=32 --sort_buffer_size=512K --net_buffer_length=8K > > --read_buffer_size=256K --read_rnd_buffer_size=256K --slow_query_log=1 > > --slow_query_log_file=mysql-slow.log --long_query_time=0.1 > > --log-queries-not-using-indexes=on --thread_handling=pool-of-threads > > --thread_pool_idle_timeout=60 --thread_pool_max_threads=1000 > > --thread_pool_size=8 --innodb_buffer_pool_size=256M > > --innodb_strict_mode=1 --innodb_file_per_table=1 > > --innodb_flush_method=O_DIRECT --innodb_log_files_in_group=4 > > --innodb_log_file_size=50331648 --innodb_undo_logs=128 > > --innodb_undo_tablespaces=8 --slow_query_log=1 > > --slow_query_log_file=mysql-slow.log --long_query_time=30 > > --log-queries-not-using-indexes=off --log_bin=mariadblog > > --binlog_format=ROW --binlog_row_image=MINIMAL > > --max_binlog_size=10240000 --expire_logs_days=1 --server-id=1 > > --innodb_flush_log_at_trx_commit=1 --sync_binlog=1 > > --relay-log=mariadb-relay-bin --performance_schema=off > > --histogram_size=255 --histogram_type=SINGLE_PREC_HB > > --use_stat_tables=preferably --optimizer_use_condition_selectivity=4 > > > > Startup messages: > > > > Sep 25 10:40:53 srv1 mysqld: 2018-09-25 10:40:52 0 [Note] InnoDB: > > Opened 8 undo tablespaces > > Sep 25 10:40:53 srv1 mysqld: 2018-09-25 10:40:53 0 [Warning] InnoDB: > > Failed to set memory to DODUMP: Invalid argument ptr 0x2aaac5400000 > > size 2097152 Sep 25 10:40:53 srv1 mysqld: 2018-09-25 10:40:53 0 > > [Note] InnoDB: 128 out of 128 rollback segments in 8 undo tablespaces > > are active. > > > > Shutdown messages: > > > > Sep 25 10:41:18 srv1 mysqld: 2018-09-25 10:41:18 0 [Note] InnoDB: > > Buffer pool(s) dump completed at 180925 10:41:18 > > Sep 25 10:41:19 srv1 mysqld: 2018-09-25 10:41:19 0 [Warning] InnoDB: > > Failed to set memory to DODUMP: Invalid argument ptr 0x2aaac3400000 > > size 33554432 Sep 25 10:41:19 srv1 mysqld: 2018-09-25 10:41:19 0 > > [Note] InnoDB: Shutdown completed; log sequence number 1522725; > > transaction id 22 > > > > Do you have ideas on what is causing "InnoDB: Failed to set memory to > > DODUMP: Invalid argument ptr .. " warning? > > > > > > > Kenneth > >

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[Maria-discuss] pam / ldap auth
by mourik jan c heupink 25 Sep '18

25 Sep '18

Hi, I installed mariadb using the stock debian packages, configured pam authentication, and configured a mysql pam module like this: > /etc/pam.d/mysql > auth required pam_winbind.so > account required pam_winbind.so As I also added the server to my AD domain, this basically gives my samba winbind users access to mysql using their windows credentials: > root@mysqlserver:~# mysql -udomain_username -p > Enter password: <windows_domain_password> > Welcome to the MariaDB monitor. Commands end with ; or \g. > Your MariaDB connection id is 6 > Server version: 10.1.26-MariaDB-0+deb9u1 Debian 9.1 > > Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others. > > Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. > > MariaDB [(none)]> So I was happy. Initially. :-) Until I found out this works only from the localhost mariadb is running on. Trying this from a remote mysql client gives: > user@e7470 ~ $ mysql -udomain_user -p -h mysqlserver.full.address > Enter password: ERROR 2059 (HY000): Authentication plugin 'dialog' cannot be loaded: /usr/lib/mysql/plugin/dialog.so: cannot open shared object file: No such file or directory and searching on that remote server for /usr/lib/mysql/plugin/dialog.so gives no results: > user@e7470 ~ $ dpkg --search /usr/lib/mysql/plugin/dialog.so > dpkg-query: no path found matching pattern /usr/lib/mysql/plugin/dialog.so Anyone here with a good suggestion how to make this work from a 'regular' remote mysql client? But more fundamentally: is it possible to have mariadb ldap auth on a server, *without* requiring anything special on the client side? MJ

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[Maria-discuss] MariaDB + RocksDB: MemTables Compactation
by Juan Telleria Ruiz de Aguirre 24 Sep '18

24 Sep '18

Dear MariaDB Developers, I have an issue with RocksDB, as it takes a lot of Memory after performing a Bulk Load, taking almost 30GB of RAM Memory after data ingestion. My question is: ¿How can I flush RocksDB Compactation MemTables after the Data Bulk Load? ¿Is there any FLUSH TABLES ROCKSDB command sort of? Thank you, Juan Here is my.ini Configuration: ######################################################################## ######################################################################## ########### MARIADB: TORNADO24 CONFIGURATION FILE - ROCKSDB ############ ######################################################################## ######################################################################## ######################################################################### ############################# client #################################### ######################################################################### # The following options will be passed to all MariaDB clients [client] port = 3305 #socket = /tmp/mysql.sock socket = C:/Program Files/MariaDB 10.3/data/mysql.sock #pid-file = C:/Program Files/MariaDB 10.3/data/mysql.pid default-character-set = latin1 # Here follows entries for some specific programs ######################################################################### ############################ mariadb #################################### ######################################################################### [mariadb] #local_infile = 1 # ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| # # |||||||||||||||||||||||||||||| GENERAL |||||||||||||||||||||||||||||| # # ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| # # The MariaDB server [mysqld] port = 3305 #socket = /tmp/mysql.sock socket = C:/Program Files/MariaDB 10.3/data/mysql.sock #pid-file = C:/Program Files/MariaDB 10.3/data/mysql.pid tmpdir = F:/MariaDB 10.3/temp/ # Table type which is used by default when creating new tables, if not # specified differently during the CREATE TABLE statement. # The default storage engine that will be used when new tables are created. default-storage-engine = rocksdb # Default storage engine that will be used for tables created with # CREATE TEMPORARY TABLE (Whichever this Engine, Aria Engine will always # be used for internal temporary tables, as materialized tables in subqueries, # or other internal tables). RocksDB does not perform well for Temporary Tables, # which require fast INSERT INTO...VALUES in Loops (For example: Cursors). default_tmp_storage_engine = aria # The default character set that will be used when a new schema or table is # created and no character set is defined character-set-server = latin1_bin collation-server = latin1_spanish_ci # Set the SQL mode to strict # Default: sql-mode="STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION" sql_mode = "" # *************************** OTHER *********************************** # group_concat_max_len = 1048576 event_scheduler = ON net_write_timeout = 3600 net_read_timeout = 3600 #local_infile = 1 # ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| # # ||||||||||||||||||||||||||| DATA STORAGE |||||||||||||||||||||||||||| # # ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| # # Path to the database root datadir = F:/MariaDB 10.3/data # ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| # # |||||||||||||||||||||||||||||| SAFETY ||||||||||||||||||||||||||||||| # # ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| # # The maximum size of a query packet the server can handle as well as # maximum query size server can process (Important when working with # large BLOBs). enlarged dynamically, for each connection. max_allowed_packet = 512M # Maximum amount of errors allowed per host. If this limit is reached, # the host will be blocked from connecting to the MariaDB server until # "FLUSH HOSTS" has been run or the server was restarted. Invalid # passwords and other errors during the connect phase result in # increasing this value. See the "Aborted_connects" status variable for # global counter. max_connect_errors = 1000 # Secure File Priv. # Disabled: secure-file-priv="C:/ProgramData/MySQL/MySQL Server 5.7/Uploads/" # ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| # # |||||||||||||||||||||||| CACHES AND LIMITS |||||||||||||||||||||||||| # # ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| # # Maximum size for internal (in-memory) temporary tables. If a table # grows larger than this value, it is automatically converted to disk # based table This limitation is for a single table. There can be many # of them. tmp_table_size = 512M # Maximum allowed size for a single HEAP (in memory) table. This option # is a protection against the accidential creation of a very large HEAP # table which could otherwise use up all memory resources. max_heap_table_size = 1024M # Query cache is used to cache SELECT results and later return them # without actual executing the same query once again. Having the query # cache enabled may result in significant speed improvements, if your # have a lot of identical queries and rarely changing tables. See the # "Qcache_lowmem_prunes" status variable to check if the current value # is high enough for your load. # Note: In case your tables change very often or if your queries are # textually different every time, the query cache may result in a # slowdown instead of a performance improvement. query_cache_size = 1M # How many threads we should keep in a cache for reuse. When a client # disconnects, the client's threads are put in the cache if there aren't # more than thread_cache_size threads from before. This greatly reduces # the amount of thread creations needed if you have a lot of new # connections. (Normally this doesn't give a notable performance # improvement if you have a good thread implementation.) thread_cache_size = 256 # The maximum amount of concurrent sessions the MariaDB server will # allow. One of these connections will be reserved for a user with # SUPER privileges to allow the administrator to login even if the # connection limit has been reached. # Low value choosen is order to reduce RAM Memory Allocation. max_connections = 50 # The number of open tables for all threads. Increasing this value # increases the number of file descriptors that mysqld requires. # Therefore you have to make sure to set the amount of open files # allowed to at least 4096 in the variable "open-files-limit" in # section [mysqld_safe] table_open_cache = 4096 # ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| # # ||||||||||||||||||||||||||||| LOGGING ||||||||||||||||||||||||||||||| # # ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| # # General and Slow logging. log-output='FILE,TABLE' general-log=0 general_log_file="NGALARRETA-P700.log" # Error Logging. log-error = C:/Program Files/MariaDB 10.3/data/NGALARRETA-P700-error.log log_queries_not_using_indexes = 0 slow-query-log = 0 slow-query-log-file = C:/Program Files/MariaDB 10.3/data/NGALARRETA-P700-slow.log long_query_time = 1800 # Binary Logging. # log-bin # ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| # # ||||||||||||||||||||||||||| ALL ENGINES ||||||||||||||||||||||||||||| # # ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| # # Sort buffer is used to perform sorts for some ORDER BY and GROUP BY # queries. If sorted data does not fit into the sort buffer, a disk # based merge sort is used instead - See the "Sort_merge_passes" # status variable. Allocated per thread if sort is needed. # If you see many sort_merge_passes per second in SHOW GLOBAL STATUS # output, you can consider increasing the sort_buffer_size value to # speed up ORDER BY or GROUP BY operations that cannot be improved with # query optimization or improved indexing. # Commented for choosing default values. sort_buffer_size = 256K # This buffer is used for the optimization of full JOINs (JOINs without # indexes). Such JOINs are very bad for performance in most cases # anyway, but setting this variable to a large value reduces the # performance impact. See the "Select_full_join" status variable for a # count of full JOINs. Allocated per thread if full join is found # The minimum size of the buffer that is used for plain index scans, range # index scans, and joins that do not use indexes and thus perform full # table scans. # Commented for Default Value. join_buffer_size = 256K # ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| # # |||||||||||||||||||||||||||||| OTHERS ||||||||||||||||||||||||||||||| # # ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| # # back_log is the number of connections the operating system can keep in # the listen queue, before the MariaDB connection manager thread has # processed them. If you have a very high connection rate and experience # "connection refused" errors, you might need to increase this value. # Check your OS documentation for the maximum value of this parameter. # Attempting to set back_log higher than your operating system limit # will have no effect. # You need to increase this only if you expect a large number of # connections in a short period of time. back_log = 150 # Only cache result sets that are smaller than this limit. This is to # protect the query cache of a very large result set overwriting all # other query results. query_cache_limit = 2M # Minimum word length to be indexed by the full text search index. # You might wish to decrease it if you need to search for shorter words. # Note that you need to rebuild your FULLTEXT index, after you have # modified this value. ft_min_word_len = 3 # Thread stack size to use. This amount of memory is always reserved at # connection time. MariaDB itself usually needs no more than 64K of # memory, while if you use your own stack hungry UDF functions or your # OS requires more stack for some operations, you might need to set this # to a higher value. thread_stack = 297K # Set the default transaction isolation level. Levels available are: # READ-UNCOMMITTED, READ-COMMITTED, REPEATABLE-READ, SERIALIZABLE # This variable's name might change to tx_isolation in future versions # of MariaDB transaction-isolation = REPEATABLE-READ # Set the query cache type. 0 for OFF, 1 for ON and 2 for DEMAND. query_cache_type=0 # The number of table definitions (from .frm files) that can be stored # in the definition cache. If you use a large number of tables, you can # create a large table definition cache to speed up opening of tables. # The table definition cache takes less space and does not use file # descriptors, unlike the normal table cache. # The minimum and default values are both 400. table_definition_cache=1400 # If the value of this variable is greater than 0, a replication slave # synchronizes its master.info file to disk. # (using fdatasync()) after every sync_master_info events. sync_master_info=10000 # If the value of this variable is greater than 0, the MySQL server # synchronizes its relay log to disk. # (using fdatasync()) after every sync_relay_log writes to the relay log. sync_relay_log=10000 # If the value of this variable is greater than 0, a replication # slave synchronizes its relay-log.info file to disk. # (using fdatasync()) after every sync_relay_log_info transactions. sync_relay_log_info=10000 ######################################################################### ########################## REPLICATION ################################## ######################################################################### # Server Id. # Used to identify master and slave servers in replication. The server_id # must be unique for each server in the replicating group. If left at 0, # the default, a slave will not connect to a master, and a master will # refuse all slave connections. # server_id=0 # Replication Slave (comment out master section to use this) # # To configure this host as a replication slave, you can choose between # two methods : # # 1) Use the CHANGE MASTER TO command (fully described in our manual) - # the syntax is: # # CHANGE MASTER TO MASTER_HOST=<host>, MASTER_PORT=<port>, # MASTER_USER=<user>, MASTER_PASSWORD=<password> ; # # where you replace <host>, <user>, <password> by quoted strings and # <port> by the master's port number (3306 by default). # # Example: # # CHANGE MASTER TO MASTER_HOST='125.564.12.1', MASTER_PORT=3306, # MASTER_USER='joe', MASTER_PASSWORD='secret'; # # OR # # 2) Set the variables below. However, in case you choose this method, then # start replication for the first time (even unsuccessfully, for example # if you mistyped the password in master-password and the slave fails to # connect), the slave will create a master.info file, and any later # change in this file to the variables' values below will be ignored and # overridden by the content of the master.info file, unless you shutdown # the slave server, delete master.info and restart the slaver server. # For that reason, you may want to leave the lines below untouched # (commented) and instead use CHANGE MASTER TO (see above) # # required unique id between 2 and 2^32 - 1 # (and different from the master) # defaults to 2 if master-host is set # but will not function as a slave if omitted #server-id = 2 # # The replication master for this slave - required #master-host = <hostname> # # The username the slave will use for authentication when connecting # to the master - required #master-user = <username> # # The password the slave will authenticate with when connecting to # the master - required #master-password = <password> # # The port the master is listening on. # optional - defaults to 3306 #master-port = <port> # # binary logging - not required for slaves, but recommended #log-bin=mysql-bin # # binary logging format - mixed recommended #binlog_format=mixed # *** Replication related settings # Unique server identification number between 1 and 2^32-1. This value # is required for both master and slave hosts. It defaults to 1 if # "master-host" is not set, but will MariaDB will not function as a master # if it is omitted. # server-id = 1 # # Replication Slave (comment out master section to use this) # # To configure this host as a replication slave, you can choose between # two methods : # # 1) Use the CHANGE MASTER TO command (fully described in our manual) - # the syntax is: # # CHANGE MASTER TO MASTER_HOST=<host>, MASTER_PORT=<port>, # MASTER_USER=<user>, MASTER_PASSWORD=<password> ; # # where you replace <host>, <user>, <password> by quoted strings and # <port> by the master's port number (3306 by default). # # Example: # # CHANGE MASTER TO MASTER_HOST='125.564.12.1', MASTER_PORT=3306, # MASTER_USER='joe', MASTER_PASSWORD='secret'; # # OR # # 2) Set the variables below. However, in case you choose this method, then # start replication for the first time (even unsuccessfully, for example # if you mistyped the password in master-password and the slave fails to # connect), the slave will create a master.info file, and any later # changes in this file to the variable values below will be ignored and # overridden by the content of the master.info file, unless you shutdown # the slave server, delete master.info and restart the slaver server. # For that reason, you may want to leave the lines below untouched # (commented) and instead use CHANGE MASTER TO (see above) # # required unique id between 2 and 2^32 - 1 # (and different from the master) # defaults to 2 if master-host is set # but will not function as a slave if omitted #server-id = 2 # # The replication master for this slave - required #master-host = <hostname> # # The username the slave will use for authentication when connecting # to the master - required #master-user = <username> # # The password the slave will authenticate with when connecting to # the master - required #master-password = <password> # # The port the master is listening on. # optional - defaults to 3306 #master-port = <port> # # Make the slave read-only. Only users with the SUPER privilege and the # replication slave thread will be able to modify data on it. You can # use this to ensure that no applications will accidently modify data on # the slave instead of the master #read_only ######################################################################### ######################### innodb (Skipped) ############################## ######################################################################### skip-innodb ############################################################################################################################ ############################################################################################################################ ############################################################################################################################ # MariaDB ROCKSDB Engine Server Variables Performance-Tuning (Optimized 50/50 Snappy) ############################################################################################################################ ############################################################################################################################ ############################################################################################################################ ############################################################################################################################# # rocksdb_block_size ############################################################################################################################# # NOTES: # a) I/O Unit (Not fully Aligned). # b) Default is 4KB. 16 KB gives better space savings, but needs extra CPU for decompression. # c) Measure trade-offs between 4K, 8K, 16K and 32 K. # d) Check the size of data of the block cache in DB_BLOCK_CACHE_USAGE Column of the INFORMATION_SCHEMA.ROCKSDB_DBSTATS table. rocksdb_block_size = 8192 # Default Value: 4096 (4K) ############################################################################################################################# # rocksdb_block_cache_size ############################################################################################################################# # DESCRIPTION: Block_cache size for RocksDB. # NOTES: RocksDB’s Internal Cache. Similar to innodb_buffer_pool_size, but less important since RocksDB relies on OS cache too. # Set Variable depending on objective "Commit(kB)" to be set in RAM Memory by the "mysqld" process. rocksdb_block_cache_size = 2G # Default: 512 MB # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ # Index & Filter Blocks # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ # IMPORTANT: Both Options MUST always be set to ON (1) in order to limit resources to rocksdb_block_cache_size Memory to the # objective "Commit" Load. # rocksdb_cache_index_and_filter_blocks: If you set cache_index_and_filter_blocks to true, index and filter blocks # will be stored in block cache, together with all other data blocks. # # This allows to effectively limit allocated resources. # # rocksdb_pin_l0_filter_and_index_blocks_in_cache: Minimizes performance impact of rocksdb_cache_index_and_filter_blocks = ON, # in order to effectively limit resources without a decrease in performance. rocksdb_cache_index_and_filter_blocks = 1 rocksdb_pin_l0_filter_and_index_blocks_in_cache = 1 ############################################################################################################################# # ROCKSDB WAL Configuration Settings ############################################################################################################################# # NOTES: # Control Maximum WAL Size. # Setting as large as total InnoDB Log Size would be fine. rocksdb_max_total_wal_size = 4G # Default: 0 rocksdb_wal_dir = F:/MariaDB 10.3/data # rocksdb_wal_dir: Recommended to set the WAL path on a different SSD (Whenever its possible). ############################################################################################################################# # rocksdb_max_background_jobs ############################################################################################################################# # DEFINITION: Maximum number of concurrent background jobs, including flushes and compactions. RocksDB will automatically # decide how to allocate the available job slots to flushes and compactions. # VALUE RANGE: -1 to 64. # DEFAULT: 2. # WARNING: This option must be used with MariaDB 10.3.8 as “rocksdb_max_background_compactions” # and “rocksdb_max_background_flushes” variables have been DEPRECATED. rocksdb_max_background_jobs = 36 ############################################################################################################################# # rocksdb_lock_wait_timeout ############################################################################################################################# # DESCRIPTION: Number of seconds to wait for lock. rocksdb_lock_wait_timeout = 2 # Default: 1 ############################################################################################################################# # rocksdb_max_open_files ############################################################################################################################# # NOTE: # a) Increase file descriptor limit for mysqld process (Increase nofile in /etc/security/limits.conf) # b) If setting greater than 0, RocksDB still uses table_cache, which will lock a mutex every time you access the file. # I think you'll see much greater benefit with -1 because then you will not need to go through LRUCache to get the table you # need. # # IMPORTANT: Keep all files Open! (-1) # rocksdb_max_open_files = -1 # Default Value: -1 ############################################################################################################################# # rocksdb_db_write_buffer_size ############################################################################################################################# # DESCRIPTION: This is the maximum size of all Write Buffers across all Collumn Families in the database. # It represents the amount of data to build up in memory (backed by an unsorted log on disk) across all # column families before writing to a sorted on-disk file. # # "Total size of memtables across column families". This can be used to manage the total memory used by memtables. # # This is distinct from write_buffer_size, which enforces a limit for a single memtable. # # By default this feature is disabled (by being set to 0). You should not need to change it. rocksdb_db_write_buffer_size = 4G # Default Value: 0 (Disabled). ############################################################################################################################# # Other Configurations (CF Options) ############################################################################################################################# rocksdb_table_cache_numshardbits = 6 # Default: 6. Optimal 50/50 Snappy: 6. # ----------------------------------------------------------------------------------- # Options to Enable or Disable # ----------------------------------------------------------------------------------- # NOTE: "allow_mmap_reads" cannot be used with "use_direct_reads" or "use_direct_io_for_flush_and_compaction". Otherwise Server # CRASHES. rocksdb_allow_mmap_reads = 1 # Default: 0 # Useful for SSD Disks. Do not set with Spinning Disks. rocksdb_allow_mmap_writes = 0 # Default: 0 rocksdb_use_fsync = 0 # Default: 0 rocksdb_use_adaptive_mutex = 0 # Default: 0 # ----------------------------------------------------------------------------------- # Rate Limiter # ----------------------------------------------------------------------------------- rocksdb_bytes_per_sync = 512000 # Default: 0. Optimal: 512 KB. rocksdb_wal_bytes_per_sync = 4194304 # Default: 0. Set to 4MB. rocksdb_rate_limiter_bytes_per_sec = 419430400 # Default: 0. Set to 400 MB/s. Increase if you're running on higher. # ----------------------------------------------------------------------------------- # Triggering Compaction if there are many Sequential Deletes # ----------------------------------------------------------------------------------- # NOTE: DESCRIPTION: "RocksDB will trigger compaction for the file if it has more than the specified number # of sequential deletes per window". rocksdb_compaction_sequential_deletes_count_sd=1 # Default: 0 rocksdb_compaction_sequential_deletes=199999 # Default: 0 rocksdb_compaction_sequential_deletes_window=200000 # Default: 0 # ----------------------------------------------------------------------------------- # Max Subcompactations # ----------------------------------------------------------------------------------- # DESCRIPTION: This value represents the maximum number of threads that will concurrently perform a compaction job by breaking it into multiple, # smaller ones that are run simultaneously. # DEFAULT: 1 (i.e. no subcompactions) # # NOTES: L0 to L1 compaction cannot be parallelized. In some cases, it may become a bottleneck that limit the total # compaction speed. In this case, users can set max_subcompactions to more than 1. In this case, we'll try to partition the # range and use multiple threads to execute it. # # Set up compression more aggressively and allocate more threads for flush and compaction. rocksdb_max_subcompactions = 2 # Default: 1 ############################################################################################################################# # Override cf options for RocksDB. ############################################################################################################################# rocksdb_default_cf_options="write_buffer_size=512m;max_bytes_for_level_base=2048m;target_file_size_base=256m;max_bytes_for_level_multiplier=10;max_write_buffer_number=12;min_write_buffer_number_to_merge=4;target_file_size_multiplier=1;level0_file_num_compaction_trigger=1;level0_slowdown_writes_trigger=36;level0_stop_writes_trigger=42;source_compaction_factor=2;max_grandparent_overlap_factor=10" #------------------------------------------------------------- # MOST IMPORTANT SETTINGS: Optimal 50/50 Snappy #------------------------------------------------------------- # write_buffer_size: Sets the size of a single memtable. Once memtable exceeds this size, it is marked immutable and # a new one is created.It represents the amount of data to build up in memory (backed by an unsorted # log on disk) before converting to a sorted on-disk file. The default is 64 MB. # You need to budget for 2 x your worst case memory use. If you don't have enough memory for this, # you should reduce this value. # # "You can think of memtables as in-memory write buffers. Each new key-value pair is first written # to the memtable. Memtable size is controlled by the option write_buffer_size. It's usually not a # big memory consumer. However, memtable size is inversely proportional to write amplification # -- the more memory you give to the memtable, the less the write amplification is. # # If you increase your memtable size, be sure to also increase your L1 size! L1 size is controlled by # the option *"max_bytes_for_level_base"*. # # Baseline: 256 MB. Optimized 50/50 Snappy: 512MB # # max_bytes_for_level_base: Write amplification. *"max_bytes_for_level_base"* is total size of level 1. As mentioned, we recommend # that this be around the size of level 0. Each subsequent level is *"max_bytes_for_level_multiplier"* # larger than previous one. The default is 10 and we do not recommend changing that. # It could be Set Same Value than "Cache Size". # # target_file_size_base: "Default Value is 64MB". Increasing "*target_file_size_base*" will reduce total number of database files, # which is generally a good thing. We recommend setting target_file_size_base to be # *"max_bytes_for_level_base*" / 10, so that there are 10 files in level 1". # # max_bytes_for_level_multiplier: Default: 10 (Optimal Value). # # target_file_size_multiplier: Optimal Value: 1 # # compression: Default: Snappy (Optimal). # #------------------------------------------------------------- # OTHER SETTINGS: #------------------------------------------------------------- # min_write_buffer_number_to_merge: "Minimum number of memtables to be merged before flushing to storage. # # For example: # * If this option is set to 2, immutable memtables are only flushed when there are 2 of them # - a single immutable memtable will never be flushed. # * If multiple memtables are merged together, less data may be written to storage since two updates # are merged to a single key. # # Recommended Value: 4 (Optimal 50/50 Snappy). # level0_file_num_compaction_trigger: "Number of files to trigger level-0 compaction. A value <0 means that level-0 compaction will # not be triggered by number of files at all". Default: 4. # # For example, if level0_file_num_compaction_trigger = 8 and every flushed file is 100MB. # Then as soon as there is 8 files, they are compacted to one 800MB file. And after we have 8 # new 100MB files, they are compacted in the second 800MB, and so on. Eventually we'll have a list # of 800MB files and no more than 8 100MB files. # # Optimal Value: 1. # max_write_buffer_number: "When the number of memtables waiting to flush is greater or equal to max_write_buffer_number, writes are # fully stopped to wait for flush finishes. # # The number of in-memory memtables. Each memtable is of size write_buffer_size. # # Default: 2. Recommended Value: Same as "Total Physical CPU" # level0_slowdown_writes_trigger: If level0_slowdown_writes_trigger, a limited write rate to DB is activated. # # Recommended Value: Same as "Total Physical CPU" x3 # # level0_stop_writes_trigger: If level0_stop_writes_trigger, writes to DB are stopped. # # Recommended Value: Same as "Total Physical CPU" x3.5 # # source_compaction_factor: Maximum number of bytes in all source files to be compacted in a single compaction run. # # Default: 1. Optimal 50/50 Snappy: 2 # # max_grandparent_overlap_factor: Only for level-based compactions. Default: 10. Optimal 50/50 Snappy: 10 ############################################################################################################################# # Options to Use with Spinning Disks ############################################################################################################################# # WARNING: Do not use the Options in this Section ("rocksdb_compaction_readahead_size", "rocksdb_use_direct_reads", # "rocksdb_use_direct_io_for_flush_and_compaction"), as they do not work with "rocksdb_allow_mmap_reads", resulting # in Server's Data Corruption. # Throughput gap between random read vs. sequential read is much higher in spinning disks. Suggestions: #--------------------------------------------------------- # Compaction Readahead Size #--------------------------------------------------------- #If non-zero, we perform bigger reads when doing compaction. If you're running RocksDB on spinning disks, you should set this to # at least 2MB (e.g: 16MB). We enforce it to be 2MB if you don't set it with direct I/O. rocksdb_compaction_readahead_size=0 # Default: 0 #--------------------------------------------------------- # Direct Reads #--------------------------------------------------------- # NOTE: * "allow_mmap_reads" cannot be used with "use_direct_reads" or "use_direct_io_for_flush_and_compaction" # * "allow_mmap_writes" cannot be used with "use_direct_io_for_flush_and_compaction", i.e., they cannot be set to true at # the same time. rocksdb_use_direct_reads=0 # Default: 0 rocksdb_use_direct_io_for_flush_and_compaction=0 # Default: 0 ############################################################################################################################# # Data Loading: Bulk Load ############################################################################################################################# # DESCRIPTION: Commit rows implicitly every rocksdb_bulk_load_size, on bulk load/insert, update and delete. # NOTE: Session Variables. rocksdb_commit_in_the_middle = 1 # Default: 0 # Maximum number of locks a transaction can have: rocksdb_max_row_locks = 1048576 ############################################################################################################################# # MyRocks Crash Recovery ############################################################################################################################# # MyRocks supports crash recovery. Crash recovery is done by replaying transaction logs from WAL (Write Ahead Log) files. # MyRocks has a system variable rocksdb_wal_recovery_mode to control how to apply logs, if any of the WAL entries is corrupted. # This variable can be any of the following options: # # 0: If a corrupted WAL entry is detected as the last entry in the WAL, truncate the entry and start up normally; otherwise, # refuse to start. # # 1 (default): If a corrupted WAL entry is detected, fail to start. This is the most conservative recovery mode. # # 2: If a corrupted WAL entry is detected in the middle of the WAL, truncate all of WAL entries after that (even though there # may be uncorrupted entries) and then start up normally. For Replication Slaves, this option is fine, since the slave # instance can recover any lost data from the master without breaking consistency. For Replication Masters, this option # may end up losing data if you do not run failover. For example, if the master crashed and was restarted (by mysqld_safe, # or auto restart after OS reboot) with this mode and it silently truncated several WAL entries, the master would lose some # data which may be present on one or more slaves. # # 3: If a corrupted WAL entry is detected in the middle of the WAL, skip the WAL entry and continue to apply as many healthy WAL # entries as possible. This is the most dangerous recovery option and it is not generally recommended. rocksdb_wal_recovery_mode = 1 # Default: 1 ######################################################################### ###### myisam (Performance_Schema Variables: Joins not necessary) ####### ######################################################################### # If set, external locking for MyISAM tables is disabled. # skip_external_locking = 1 # Size of the Key Buffer, used to cache index blocks for MyISAM tables. # Do not set it larger than 30% of your available memory, as some memory # is also required by the OS to cache rows. Even if you're not using # MyISAM tables, you should still set it to 8-64M as it will also be # used for internal temporary disk tables. # If you don't use MyISAM tables explicitly you can set key_buffer_size # to a very low value, 64K for example. # 32 [GB] (Tornado24 Half RAM)· 0,25 = 8[GB] key_buffer_size = 64K # This buffer is allocated when MariaDB needs to rebuild the index in # REPAIR, OPTIMIZE, ALTER table statements as well as in LOAD DATA INFILE # into an empty table. It is allocated per thread so be careful with # large settings. # myisam_sort_buffer_size = 128M # The maximum size of the temporary file MariaDB is allowed to use while # recreating the index (during REPAIR, ALTER TABLE or LOAD DATA INFILE. # If the file-size would be bigger than this, the index will be created # through the key cache (which is slower). # myisam_max_sort_file_size = 50G # If a table has more than one index, MyISAM can use more than one # thread to repair them by sorting in parallel. This makes sense if you # have multiple CPUs and plenty of memory. # myisam_repair_threads = 6 # Automatically check and repair not properly closed MyISAM tables. # myisam_recover_options = FORCE,BACKUP # When reading rows in sorted order after a sort, the rows are read # through this buffer to avoid disk seeks. You can improve ORDER BY # performance a lot, if set this to a high value. # Allocated per thread, when needed. # read_rnd_buffer_size = 265K ######################################################################### ################# MyISAM & Aria System Variables ######################## ######################################################################### # Values in [MB] range turn out into a performance decrease # Size of the buffer used for doing full table scans. # Allocated per thread, if a full scan is needed. read_buffer_size = 256K # MyISAM uses special tree-like cache to make bulk inserts (that is, # INSERT ... SELECT, INSERT ... VALUES (...), (...), ..., and LOAD DATA # INFILE) faster. This variable limits the size of the cache tree in # bytes per thread. Setting it to 0 will disable this optimisation. Do # not set it larger than "key_buffer_size" for optimal performance. # This buffer is allocated when a bulk insert is detected. # Values of 1/4 key_buffer_size make sense (Percona). It is per connection, # so a 1/16 ratio is choosen in order not to use excesive resources: # 8[GB] (key_buffer_size) / 16 = 512[MB] (bulk_insert_buffer_size) # Same value has been choosen as tmp_table_size (For those cases in which # Temporary Tables exceed 512M and use MyISAM instead of Memory Engine). # MyISAM uses a special tree-like cache to make bulk # inserts faster for INSERT ... SELECT, INSERT ... # VALUES (...), (...), ..., and LOAD DATA INFILE when # adding data to NON-EMPTY TABLES. # limits the size of the cache tree in bytes per thread. bulk_insert_buffer_size=256M ######################################################################### ############# Aria System Variables (Disk Temporary Tables) ############# ######################################################################### # The maximum size of the temporary file MariaDB is allowed to use while # recreating the index (during REPAIR, ALTER TABLE or LOAD DATA INFILE. # If the file-size would be bigger than this, the index will be created # through the key cache (which is slower). aria_max_sort_file_size = 100G # Size of the Key Buffer, used to cache index blocks for Aria tables. # Do not set it larger than 30% of your available memory, as some memory # is also required by the OS to cache rows. Even if you're not using # Aria tables, you should still set it to 8-64M as it will also be # used for internal temporary disk tables. aria_pagecache_buffer_size = 4G # If a table has more than one index, MyISAM can use more than one # thread to repair them by sorting in parallel. This makes sense if you # have multiple CPUs and plenty of memory. aria_repair_threads = 49 # This buffer is allocated when MariaDB needs to rebuild the index in # REPAIR, OPTIMIZE, ALTER table statements as well as in LOAD DATA INFILE # into an empty table. It is allocated per thread so be careful with # large settings. aria_sort_buffer_size = 128M # Automatically check and repair not properly closed MyISAM tables. # In MariaDB 10.3.0 aria_recover is renamed to aria_recover_options. aria_recover_options = FORCE,BACKUP # Path to the directory where to store transactional log: aria_log_dir_path=C:/Program Files/MariaDB 10.3/data ######################################################################### ########################### mysqldump ################################### ######################################################################### [mysqldump] # Do not buffer the whole result set in memory before writing it to # file. Required for dumping very large tables quick quick # The maximum size of one packet or any generated or intermediate string, # or any parameter sent by the mysql_stmt_send_long_data() C API function. max_allowed_packet = 16M ######################################################################### ############################# mysql ##################################### ######################################################################### [mysql] no-auto-rehash # Remove the next comment character if you are not familiar with SQL # sql_safe_updates = 0 #local_infile = 1 ######################################################################### ############################## mysqld_safe ############################## ######################################################################### # ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| # # |||||||||||||||||||||||| CACHES AND LIMITS |||||||||||||||||||||||||| # # ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| # [mysqld_safe] # Increase the amount of open files allowed per process. Warning: Make # sure you have set the global system limit high enough! The high value # is required for a large number of opened tables # Changes the number of file descriptors available to mysqld. # You should try increasing the value of this option if mysqld gives you # the error "Too many open files". # Default Value: Autosized # open_files_limit = 65535 # Number of table definitions that can be cached. table_definition_cache = 4096 ######################################################################### ############################## myisamchk ################################ ######################################################################### [myisamchk] key_buffer_size = 256M sort_buffer_size = 256M read_buffer = 2M write_buffer = 2M ######################################################################### ############################## mysqlhotcopy ############################# ######################################################################### [mysqlhotcopy] interactive-timeout ######################################################################### ############################ mysqld ##################################### ######################################################################### [mysqld] character-set-server = latin1 collation-server = latin1_spanish_ci #local_infile = 1 [client-server] #local_infile = 1

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[Maria-discuss] Fulltext in Galera - Index is corrupt?
by Antonio García Domínguez 17 Sep '18

17 Sep '18

Hello everyone, We are evaluating various approaches for horizontal scalabilty of fulltext searching, and we thought about trying out Galera. We set up a 3-node cluster in Google Cloud Compute, and we tried loading a collection of 90k synthetic documents into a table like this one: CREATE TABLE `documents` ( `id` int(11) NOT NULL AUTO_INCREMENT, `filename` varchar(255) DEFAULT NULL, `text` longtext DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=282232 DEFAULT CHARSET=latin1 We followed the recommendation in the MariaDB docs of inserting everything, then creating the FULLTEXT index by running: ALTER TABLE documents ADD FULLTEXT (text); While this works fine with a regular single node configuration (without Galera), it is crashing in our Galera setup with a message like this: Exception in thread "main" java.sql.SQLException: (conn=41) Index for table 'documents' is corrupt; try to repair it at org.mariadb.jdbc.internal.util.exceptions.ExceptionMapper.get(ExceptionMapper.java:198) at org.mariadb.jdbc.internal.util.exceptions.ExceptionMapper.getException(ExceptionMapper.java:110) at org.mariadb.jdbc.MariaDbStatement.executeExceptionEpilogue(MariaDbStatement.java:228) at org.mariadb.jdbc.MariaDbStatement.executeInternal(MariaDbStatement.java:334) at org.mariadb.jdbc.MariaDbStatement.executeUpdate(MariaDbStatement.java:520) at uk.ac.aston.erdf.mariadb.MariaDBIndexer.indexFiles(MariaDBIndexer.java:211) at uk.ac.aston.erdf.mariadb.MariaDBIndexer.runIteration(MariaDBIndexer.java:142) at uk.ac.aston.erdf.mariadb.MariaDBIndexer.run(MariaDBIndexer.java:117) at uk.ac.aston.erdf.mariadb.MariaDBIndexer.main(MariaDBIndexer.java:106) Caused by: java.sql.SQLException: Index for table 'documents' is corrupt; try to repair it Query is: ALTER TABLE documents ADD FULLTEXT (text); at org.mariadb.jdbc.internal.util.LogQueryTool.exceptionWithQuery(LogQueryTool.java:119) at org.mariadb.jdbc.internal.protocol.AbstractQueryProtocol.executeQuery(AbstractQueryProtocol.java:200) at org.mariadb.jdbc.MariaDbStatement.executeInternal(MariaDbStatement.java:328) ... 5 more We have tried dropping and recreating the database, and SHOW STATUS lists the 3 nodes just fine: MariaDB [(none)]> show status like 'wsrep_cluster%'; +--------------------------+--------------------------------------+ | Variable_name | Value | +--------------------------+--------------------------------------+ | wsrep_cluster_conf_id | 12 | | wsrep_cluster_size | 3 | | wsrep_cluster_state_uuid | 258a45dd-b9e0-11e8-bdd1-e260a7908d0f | | wsrep_cluster_status | Primary | +--------------------------+--------------------------------------+ 4 rows in set (0.001 sec) Our Galera section is pretty bog standard: we followed most of the defaults in the Ubuntu MariaDB 10.3 packages, except for disabling bin logs (they take up too much space for our 40GB cloud VMs). Here is our [galera] section: [galera] # Mandatory settings wsrep_on=ON wsrep_provider=/usr/lib/libgalera_smm.so wsrep_cluster_address=gcomm://mariadb-g1,mariadb-g2,mariadb-g3 binlog_format=row default_storage_engine=InnoDB innodb_autoinc_lock_mode=2 # # Allow server to accept connections on all interfaces. # bind-address=0.0.0.0 # # Optional setting #wsrep_slave_threads=1 innodb_flush_log_at_trx_commit=0 Are we missing something obvious, or is InnoDB FULLTEXT not yet fully supported on Galera? Should we try Mroonga instead? Thank you for your help, Antonio

1 1

[Maria-discuss] How does InnoDB delete rows?
by Arlindo Neto 13 Sep '18

13 Sep '18

Hi everyone. I have some questions regarding InnoDB deletion process. As far as I know, when we issue a DELETE command to a row stored in a InnoDB table, the row contents are stored in the UNDO Log, and the contents of the row are only deleted when the last transaction after the DELETE transaction has finished. But what actually happens to the row that was deleted? Is any disk space ever released to the OS, or are the contents simply erased? Defragmenting a table is only done through OPTIMIZE TABLE, or are there any automatic threads responsible for rearranging the rows? And if the are no such threads, how do we maintain tables which suffer from many deletions? I hope I made myself clear. Thanks in advance, Arlindo Neto.

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[Maria-discuss] dump optimization on update
by Roberto Spadim 12 Sep '18

12 Sep '18

Hi guys, i'm checking a dump optimization, probably a problem: EXPLAIN SELECT * FROM table WHERE pk1=1001 AND pk2='v' AND pk3=19808671980883 pk3 = bigint, pk1=integer, pkg2=enum('v','i','c') this return "Impossible WHERE noticed after reading const tables", my max(pk3) = 1923425, pk1 and pk2 exists but: EXPLAIN UPDATE table SET field1=1234 WHERE pk1=1001 AND pk2='v' AND pk3=19808671980883 shows: index=PRIMARY - rows = 1.055.901 - Using where maybe update didn't check max value? it's a INNODB engine this execute a full table read, and slowquery # Query_time: 15.440127 Lock_time: 0.000079 Rows_sent: 0 Rows_examined: 1.914.183 (more than table rows) -- thanks

1 0

[Maria-discuss] Aria Crash
by Roberto Spadim 31 Aug '18

31 Aug '18

Hi guys I was using mariadb and database crashed recovering give me this error and crash any idea what could be done? mariadb 10.1.5 recovered pages: 0% 3631826282% 0%180830 12:01:21 [ERROR] mysqld got signal 11 ; -- Roberto Spadim

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[Maria-discuss] Publish / Subscribe
by Roberto Spadim 31 Aug '18

31 Aug '18

Hi guys, we have nosql connections with memcache/handlersocket Could be possible integrate a publish subscribe system? I'm thinking about something like redis infrastructure, there's some jira related MDEV https://jira.mariadb.org/browse/MDEV-5263?jql=text%20~%20%22publish%22 any interest or ideas in this area? -- Roberto Spadim

1 0

[Maria-discuss] mariadb CONNECT XML table type question
by Björn Hayer 29 Aug '18

29 Aug '18

Hi, I am using CONNECT for some XML files, but lately came to a problem I was unable to solve so far. The XML has the following structure: <PhysicalLocation> <Name>Address</Name> <Area type="countrycode"> <Value>DE</Value> </Area> <Area type="postalcode"> <Value>70173</Value> </Area> <Area type="municipality"> <Value>Stuttgart</Value> </Area> </PhysicalLocation> Is there a way to get a column for the value in e.g. area type=„countrycode"? Any help is very much appreciated! Thanks! Björn

1 0

[Maria-discuss] Looking for mariadb-plugin-aws-key-management package on Ubuntu 18.04
by James Colannino 27 Aug '18

27 Aug '18

Hi everyone, I'm new to the list. Please forgive me if this is a dumb question, but I've been following this document: https://mariadb.com/kb/en/library/aws-key-management-encryption-plugin-setu… I'm using Ubuntu 18.04, and after adding the MariaDB repos and installing MariaDB, I get to the point where I need to install the mariadb-plugin-aws-key-management package and am told that this package isn't found. I see that other plugin packages exist, but not this one. I've done a ton of Googling, and the only clue I've been able to find is that an old cached package list of a mirror used to have this package, while the current package list for the same mirror doesn't. Was this package removed at some point? If so, I can't find any documentation online that says this occurred. I'm really confused and frustrated and hoping to get this plugin installed. Thanks in advance! :)

1 1

[Maria-discuss] Is disabling doublewrite safe on ZFS?
by Gionatan Danti 25 Aug '18

25 Aug '18

Hi all, as by subject: is disabling doublewrite safe on ZFS (and/or other CoW filesystems as BTRFS)? Background information: ZFS is a CoW/transactional filesystem, meaning that writes are atomic: they fully commit or are rolled backup to latest "stable" version. This lend many peoples to claim not only that disabling doublewrite is safe when InnoDB runs on top of a ZFS storage, but even that it is the *right* thing to do for increase InnoDB write performance. The reason is that when ZFS recordsize is set the same as InnoDB page/record size, no partial page write can happen. Some evidence: http://assets.en.oreilly.com/1/event/21/Optimizing%20MySQL%20Performance%20… However, I am not fully committed (pun intended!) to this idea. While I surely appreciate ZFS write atomicity, and how it *does* protect from system-wide crash (ie: powerloss), I fear that an InnoDB/MariaDB crash *can* lead to partial page writes. If, for example, the mysqld process crashes (or it is killed) when copying an internal buffer during a write() call, I can imagine the filesystem will receive wrong/partial data, which it will happily write to the main storage pool (as it know nothing of internal data consistency from InnoDB point of view). I understand that this failure scenario should be *really* rare, as the critical operation (buffer copy from mysqld to system pagecache/ARC via write()) is extremely fast compared to the real data flush to stable storage (meaning that the "vulnerable time window" is very small). However, it remain different from 100% safety. Moreover, it really backfired in the past: https://www.percona.com/blog/2015/06/17/update-on-the-innodb-double-write-b… From my understanding, disabling doublebuffer is really 100% safe only when enabling atomic writes on *a supported hardware* (https://mariadb.com/kb/en/library/atomic-write-support/) Am I missing something? Am I over-thinking it, maybe? Thanks. -- Danti Gionatan Supporto Tecnico Assyoma S.r.l. - www.assyoma.it email: g.danti(a)assyoma.it - info(a)assyoma.it GPG public key ID: FF5F32A8

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[Maria-discuss] Fwd: CVE list for connectors
by Michal Schorm 21 Aug '18

21 Aug '18

Hello, On this page: https://mariadb.com/kb/en/library/security/ I can find CVEs that affect MariaDB server and releases they were fixed in. Other useful page is this one: https://mariadb.com/kb/en/library/security-vulnerabilities-in-oracle- mysql-that-did-not-exist-in-mariadb/ -- I'd like to ask you to also list CVEs applicable for connectors and versions of connectors (CONC, CONJ, ODBC) they were fixed in, since there is not direct relationship between: 1) server nad CONC 2) ODBC and CONC Server is (or atleast should be) built on top of released version of the CONC, not the latest Git content. Atleast downstreams starts to use this scheme (separate server and client library - the CONC), so they depend only on the released versions of the CONC. -- For example CVE-2018-3081 should be fixed in CONC 3.0.5, however since nor git commit, nor CONC release notes says it explicitly, I can only guess. -- Michal Schorm Associate Software Engineer Core Services - Databases Team Red Hat

1 0

[Maria-discuss] Drop user not replicating in 10.2.16/17 galera cluster with NO_AUTO_CREATE_USER in mysql_mode
by Vincent Hoffman-Kazlauskas 15 Aug '18

15 Aug '18

Hi all, not sure if this is expected or not. I am running a test cluster in preparation for upgrading from 10.0 to 10.2 and noticed that DROP user commands were not being propagated to other members of the galera cluster. The only user management changes of note I know of was the addition of NO_AUTO_CREATE_USER to sql_mode and indeed removing that from sql_mode appears to have resolved it. My question is, is that expected behavior and if so whats the modern way of removing mysql users from a mariadb galera cluster. If not is it worthy of a bug report? Thanks, Vince

1 0

Re: [Maria-discuss] [EXTERNAL] Re: Copying database files
by Reindl Harald 14 Aug '18

14 Aug '18

Am 13.08.2018 um 11:57 schrieb Ling, Andy: >>> I'm using MariaDB 10.2.13 on Windows 7. All tables are using the Aria >>> engine. >>> >>> I am trying to initialise a slave database by copying the files between >>> PCs, but when I try and use the copied files I get the error >>> >>> Table is from another system and must be zerofilled or repaired to be >>> usable on this system >>> >>> Repairing the tables fixes this, but I'd rather not have to so that. >>> >>> I have tried various things suggested to stop this, but nothing seems to >>> help. On the source server I have run aria_chk -zerofill on all the >>> tables. Before copying the tables I run FLUSH TABLES <table list> FOR >>> EXPORT, but I still get the error. >> jesus don't copy tbale files around while the server is running >> no idea why you repsond off-list > Does that mean this is not valid then... did you read and understand it > https://mariadb.com/kb/en/library/copying-tables-between-different-mariadb-… how make you sure "The server is not accessing the tables during the copy process" "The advantage of FLUSH TABLES table_name FOR EXPORT is that the table is read locked until UNLOCK TABLES is executed" is not really true because that's only valid for the running connection "Warning: If you do the above live copy, you are doing this on your own risk" should be clear in short: nobody right in his mind copies database tables hot

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[Maria-discuss] New testsuite option
by Michal Schorm 13 Aug '18

13 Aug '18

Hello, I take care of MariaDB in Fedora & RHEL. We run the testsuite there. Every time, in every build, with --big-test. Time to time it happens that some of the tests fail. For example during a rebuild. For such cases, I'd use a way to tell MTR what is a unstable test treshold, which means "how many tests can fail to still count the testsuite run as a success". Most likely, I'd use it with value from 1-5. Any larger group of failing tests needs to get my attention. Anyway I still could spare myself of the unstable tests. -- (Asking before filling any JIRA feature request) 1) Is there already some way to do that? 2) Do you find such feature usefull? 3) Any ideas how to call such option? --max-test-fail is already used -- Michal Schorm Associate Software Engineer Core Services - Databases Team Red Hat

2 3

[Maria-discuss] Copying database files
by Ling, Andy 13 Aug '18

13 Aug '18

I'm using MariaDB 10.2.13 on Windows 7. All tables are using the Aria engine. I am trying to initialise a slave database by copying the files between PCs, but when I try and use the copied files I get the error Table is from another system and must be zerofilled or repaired to be usable on this system Repairing the tables fixes this, but I'd rather not have to so that. I have tried various things suggested to stop this, but nothing seems to help. On the source server I have run aria_chk -zerofill on all the tables. Before copying the tables I run FLUSH TABLES <table list> FOR EXPORT, but I still get the error. What do I need to do to make this work? Thanks for any help. Andy Ling ********************************************************************** DISCLAIMER: Privileged and/or Confidential information may be contained in this message. If you are not the addressee of this message, you may not copy, use or deliver this message to anyone. In such event, you should destroy the message and kindly notify the sender by reply e-mail. It is understood that opinions or conclusions that do not relate to the official business of the company are neither given nor endorsed by the company. Thank You.

2 1

[Maria-discuss] Best way to fetch user’s password hash?
by Felipe Gasper 10 Aug '18

10 Aug '18

Hi all, What is the best way to fetch a user’s password hash? I’d ideally like something that works in both MySQL and MariaDB, as many versions as possible. Thank you! -Felipe Gasper Mississauga, Ontario

2 2

[Maria-discuss] Disable Stric Mode MariaDB 10.4
by Wilmer Arambula 04 Aug '18

04 Aug '18

Hi, i need disable strict mode Maria DB 10.4, Thks, Wilmer.

2 1

[Maria-discuss] MariaDB Zulip
by Ian Gilfillan 04 Aug '18

04 Aug '18

A reminder that MariaDB is trialling Zulip, which provides both Slack-like and IRC-like functionality. Zulip is an open-source tool that can also provide native integrations with various other tools, including GitHub. At the moment the MariaDB Foundation has been using it internally for most communications, and there's not been much public activity, but we'd like to invite developers and others interested in MariaDB to come try it out as well. So far the responses from those using it have been positive. Visit it at https://mariadb.zulipchat.com.

1 0

[Maria-discuss] How to get rid of foreign keys to non existant temporary tables?
by Bernhard Weller 30 Jul '18

30 Jul '18

Hello, I have a server running MariaDB 10.1.29-MariaDB-6+b1 (on Debian). I recently tried upgrading a concrete5 installation from 8.3.2 to 8.4.1 which failed running a SQL statement: ALTER TABLE AreaLayoutsUsingPresets ADD CONSTRAINT FK_7A9049A1385521EA FOREIGN KEY (arLayoutID) REFERENCES AreaLayouts (arLayoutID) ON UPDATE CASCADE ON DELETE CASCADE With an error: SQLSTATE[HY000]: General error: 1005 Can't create table `concrete5`.`#sql-215_264a4` (errno: 121 "Duplicate key on write or update") Now after investigating that command should probably be done with foreign key checks disabled - but I'm not sure on that one. The problem which I'm having now is, that I have two foreign key entries in INNODB_SYS_FOREIGN which are for temporary tables which don't exist, so I have no idea how to remove them: ID FOR_NAME REF_NAME N_COLS TYPE concrete5/FK_3322FA75FD71026C concrete5/#sql-2a01_48f4 concrete5/Users 1 1 concrete5/FK_7A9049A1385521EA concrete5/#sql-215_26264 concrete5/AreaLayouts 1 5 I've tried creating a table with the corresponding name (#mysql50##sql-2a01_48f4) and referenced colums (uID, int(10)) for the first one. But executing ALTER TABLE `#mysql50##sql-2a01_48f4` DROP FOREIGN KEY FK_3322FA75FD71026C Results in error #1091. I'm a bit lost now - the update will certainly not work while these foreign keys are in the system blocking the unique name. Any ideas? Bernhard Weller

1 0

[Maria-discuss] Galera partitioning question
by Ryan Delgrosso 29 Jul '18

29 Jul '18

Greetings all, I am running MariaDB 10.2.16 on CentOS in AWS and am seeing a sporadic cluster partitioning and rejoining issue with seemingly no explicable cause. * I have elements in 3 different AWS availability zones in a single galera cluster * Monitoring logs I see this message: /Jul 29 05:33:53 server01 mysqld: 2018-07-29 5:33:53 139633883080448 [Note] WSREP: (eabb848a, 'tcp://0.0.0.0:4567') connection to peer 392b9516 with addr tcp://172.31.17.60:4567 timed out, no messages seen in PT3S/ * I have tried forcing a 1500byte MTU as some others sources mentioned jumbo framing could negatively impact galera replication. * Running prolonged packet captures between nodes i cannot seem to find anything else wrong, network connectivity isn't interrupted and no service restarts occur. * These partition events happen multiple times per day. Has anyone seem this sporadic cluster disconnect and re-join issue in a similar env? I did not previously note this behavior on 10.1. Any help is much appreciated. -Ryan

1 0

[Maria-discuss] Mysql replication into galera cluster Errors
by Ton Wittenberg 28 Jul '18

28 Jul '18

Hello All, currently i have one master ( Mariadb 10.0.15) most of oure databases and tables are still myisam. i made a galera cluster with 3 nodes on mariadb 10.3.8 i made a dump the master, imported it into galera cluster, and mysql replication is running but im encoutering Alot of errors: Jul 28 00:30:32 db100 mysqld[7615]: 2018-07-28 0:30:32 3807 [Warning] WSREP: SQL statement was ineffective thd: 3807 buf: 401 Jul 28 00:30:32 db100 mysqld[7615]: schema: mytable Jul 28 00:30:32 db100 mysqld[7615]: QUERY: COMMIT Jul 28 00:30:32 db100 mysqld[7615]: => Skipping replication the idea is to discontinue the 10.0.15 machine and replace it with a 3 node galera cluster. and to setup mysql replication into galera. then start inserting in galera. and then shutdown the old master to provide a smooth migration. what could this be or how can i further debug this and find out why i receive this errors? Kind regards Ton Wittenberg

1 0

[Maria-discuss] community contribution measurement page
by Daniel Black 23 Jul '18

23 Jul '18

Folks, I've prepared a community contribution measurement page: http://measure-mariadb.ozlabs.org/repo/mariadb/server-outside-org.html This is largely the code base of https://github.com/MeasureOSS/Measure known errors: * I've yet to create the organisation aspects of this site. * some top page may be distorted by non-mariadb respositories Insights and suggested improvements welcome (especially with code) :-)

3 4

[Maria-discuss] MariaDB 10.3.8 does not install on Debian 8 and 9?
by Vimal Kumar V. 19 Jul '18

19 Jul '18

Dear Friends, I am trying to install MariaDB 10.3.8 on Debian 8&9. When I try to add following repo key, apt-key adv --recv-keys --keyserver SKS key server <http://keyserver.ubuntu.com/> 0xF1656F24C74CD1D8 I got following error message, Executing: /tmp/apt-key-gpghome.YltUOLRxyc/gpg.1.sh --recv-keys --keyserver SKS key server <http://keyserver.ubuntu.com/> 0xF1656F24C74CD1D8 gpg: keyserver receive failed: Server indicated a failure Please guide me to how to bypass the problem. -- Vimal Kumar V. Technical Assistant Mahatma Gandhi University Kottayam, Kerala, India-686 560 My Home Page: http://www.vimalkumar.info My Blogs: http://linuxhalwa.blogspot.com http://kohageek.blogspot.in http://dspacegeek.blogspot.in http://moovandan.blogspot.in --------------------------------------------------------------------------- "I forget what I was taught. I only remember what I have learnt" -Patrick White

2 1

Re: [Maria-discuss] Replication Problem
by Kristian Nielsen 05 Jul '18

05 Jul '18

Thomas Plant <thomas(a)plant.systems> writes: > Your tip with 'MASTER_USE_GTID=slave_pos' fixed it.Will have to look > better in the documentation next time, never found the 'slave_pos' > mentioned or 'SET sql_log_bin=0'. > > Thank you very much for your help. Welcome, glad that you solved your problem. The slave_pos/current_pos is confusing a lot of users. It would probably have been better if current_pos had never been introduced. > so you mean that disabling the binary log on the slave would be > indicated? Can I do it while it is online? SET sql_log_bin=0 disables binlogging only for the following queries done in that connection (not in general). So yes, it can be done online. You would do it for queries that you will not want replicated to other servers. For example, if you later make this slave the master, and put the old master to replicate from the old slave (now new master), you probably do not want to replicate your earlier slave-fixup-query. Hence the suggestion to SET sql_log_bin=0 to avoid having this query in the slave binlog. But if using MASTER_USE_GTID=slave_pos, in most cases it won't matter one way or the other. - Kristian.

1 0

[Maria-discuss] Replication Problem
by Thomas Plant 04 Jul '18

04 Jul '18

Hello, I'd have a question about MariaDB 10.1 replication, which has been interrupted by a power outage in our datacenter. We started the master server and had a duplicate id in a table on the slave, so replication stopped. We did not have time to adjust this at the moment, there were a lot of other systems to start and check if all was alright. Today I had time to look at the error, removed the duplicate ID from the table and started the slave thread again using 'start slave;'. But now I get another error: Last_IO_Error: Got fatal error 1236 from master when reading data from binary log: 'Error: connecting slave requested to start from GTID 0-2-2948175468, which is not in the master's binlog. Since the master's binlog contains GTIDs with higher sequence numbers, it probably means that the slave has diverged due to executing extra erroneous transactions' Can this be resolved? Or will I have to start replication from scratch? Greetings, Thomas

5 4

[Maria-discuss] MariaDB embedded, prepared statements
by Julien Muchembled 02 Jul '18

02 Jul '18

Hello, In our application (NEO - https://neo.nexedi.com/ ), we have 2 backends: SQLite and MySQL/MariaDB We also have a benchmarking tool working with a quite small dataset and showing that SQLite is ~30% than MariaDB. For years, we supposed that SQLite performed better in some cases for 2 reasons: - everything processed in same thread (i.e. no socket or context switches) - precompiled queries And by combining both, skip any kind of string serialization (i.e. do not format a query on one side, and parse on the other side). Now, we are trying to optimize our MariaDB backend by trying to do like SQLite. = MariaDB embedded I could make it work, but only with InnoDB for the moment. I kept using the same binding, MySQLdb, which I rebuilt against libmariadbd-dev_10.1.29-6+b1_amd64.deb Currently, we only use TokuDB in production and I have the same issue as: https://forums.mysql.com/read.php?94,629158,629158 ("embedded server cannot accept a plugin engine") This user solved it by embedding his engine inside libmysqld. I wonder if it will work with TokuDB. Anyway, I haven't seen any speed improvement. = Prepared statements I couldn't find anything else that's closer to SQLite precompiled queries. Which means that there's still some formatting/parsing. | Com_stmt_execute | 96528 | | Com_stmt_prepare | 40 | But again, not faster. Well, I do my best to have stable results, like having the DB in tmpfs or disabling C-states, but it's hard to measure small changes of performance. With 10.1.29, prepared statements look slightly slower. I also tried the new EXECUTE syntax with 10.2.16 to avoid SET queries, and it may be 1% faster (< error margin). I only turned the most often used queries into prepared statements. Here is one of the most complex queries we have: SELECT tid, compression, data.hash, value, value_tid FROM obj FORCE INDEX(PRIMARY) LEFT JOIN data ON (obj.data_id = data.id) WHERE `partition`=? AND oid=? AND tid < ? ORDER BY tid DESC LIMIT 1 https://mariadb.com/kb/en/library/prepared-statements/ should explain the purpose of prepared statements. The "In addition to using prepared statements from the libmysqld" clause seems to tell there's a specific kind of prepared statements within MariaDB embedded but I haven't found anything about that. We're disappointed by all these results. Did I miss something ? If not, I'll have to do some profiling of MariaDB. Julien

1 0

Re: [Maria-discuss] [MariaDB Announce] MariaDB 10.2.16 now available
by Reindl Harald 27 Jun '18

27 Jun '18

is there any QA on your side? mysql-test-run: *** ERROR: Could not find any of /usr/sql/mysql_tzinfo_to_sql /usr/bin/mysql_tzinfo_to_sql /usr/sql/mysql_tzinfo_to_sql where the hell is "mysql_tzinfo_to_sql" gone? that it's here in "mariadb-manpages" is a packaging detail but in 10.2.16 it seems to be missing completly [root@testserver:~]$ rpm -q --file /usr/bin/mysql_tzinfo_to_sql mariadb-manpages-10.2.15-1.0.fc27.20180613.rh.sandybridge.x86_64 Am 26.06.2018 um 17:45 schrieb MariaDB Announce List: > The MariaDB project is pleased to announce the availability > of MariaDB 10.2.16, the latest stable release in the > MariaDB 10.2 series. > > See the Release Notes and Changelogs for details. > > > - - Links - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - > > MariaDB 10.2.16 > - Release Notes: https://mariadb.com/kb/en/mdb-10216-rn/ > - Changelog: https://mariadb.com/kb/en/mdb-10216-cl/ > - Downloads: https://downloads.mariadb.org/mariadb/10.2.16 > > About MariaDB 10.2: > - https://mariadb.com/kb/en/what-is-mariadb-102/ > > APT and YUM Repository Configuration Generator: > - https://downloads.mariadb.org/mariadb/repositories/ > > > - - MariaDB Books - - - - - - - - - - - - - - - - - - - - - - - - - - > > There is an ever-growing library of MariaDB books available to help > you get the most out of MariaDB. See the MariaDB Books page for > details and links: > > - https://mariadb.com/kb/en/mariadb/books/ > > > - - User Feedback plugin - - - - - - - - - - - - - - - - - - - - - - - > > MariaDB includes a User Feedback plugin. This plugin is disabled by > default. If enabled, it submits basic, completely anonymous MariaDB > usage information. This information is used by the developers to > track trends in MariaDB usage to better guide development efforts. > > If you would like to help make MariaDB better, please add > "feedback=ON" to your my.cnf or my.ini file! > > See http://mariadb.com/kb/en/user-feedback-plugin for more > information. > > > - - Quality - - - - - - - - - - - - - - - - - - - - - - - - - - - - - > > The project always strives for quality, but in reality, nothing is > perfect. Please take time to report any issues you encounter at: > > - http://jira.mariadb.org > > > - - Support MariaDB - - - - - - - - - - - - - - - - - - - - - - - - - > > If you would like to contribute to the MariaDB Foundation, please see > the "contributing" and "donations" pages. We also have merchandise > available in a cafepress store. All proceeds go to support the > MariaDB Foundation. > > - https://mariadb.com/kb/en/contributing > > - https://mariadb.org/donate/ > > > We hope you enjoy MariaDB!

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[Maria-discuss] MariaDB crashes because of "long semaphore wait" after migrating from 10.1 to 10.3
by TD 22 Jun '18

22 Jun '18

Hi, I have a Windows server that has been running MariaDB 10.1 successfully for over a year. The server remains mostly idle for long times with some read access, but occasionally there are transactions that add data (about 500k rows per commit). There can be up to 10 such transactions (one per database) at the same time and during those times the server is under quite some load (the code processing the data resides on the same server as the database). We're using an 8 core AMD Ryzen, 32 GB RAM and a Samsung SSD. Like I said, this worked fine with MariaDB 10.1 all the time. We're currently in the process of setting up a new server (specs similar to the ones above) and because MariaDB 10.3 has been released recently, I was curious and installed it. The database now constantly shuts down because of "[FATAL] InnoDB: Semaphore wait has lasted > 600 seconds. We intentionally crash the server because it appears to be hung." whenever there is one of the load situations described above. If I install MariaDB 10.1 on the new server, it runs as fine as the old one. The crashes also happen when I start with a clean database (no data migrated from 10.1 databases). I'm not a huge MariaDB config pro, as it's only a tool to store the data, it just needs to run with reasonable performance and has always worked until now. As far as I know and can judge from comments in the file, the my.ini in use is (mostly?) based on my-innodb-heavy-4G.cnf, but coworkers might have made modifications. I've attached the contents below. I don't know how I can debug this issue further. Windows event viewer contains several log warnings with the text "InnoDB: A long semaphore wait:" but no further information why this wait happens. I couldn't find any other error logs. I guess it is some configuration error (I read about MariaDB switching from XtraDB to InnoDB, so I guess that the issue might be related). Migrating to 10.3 is not an absolute must, but it would be nice to be able to fix the problem. Any help would be greatly appreciated and if you need more information, I'll gladly try to provide it. Thanks, Tom. my.ini: [mysqld] max_connections = 100 max_allowed_packet = 16M binlog_cache_size = 1M max_heap_table_size = 64M read_buffer_size = 2M read_rnd_buffer_size = 16M sort_buffer_size = 8M join_buffer_size = 8M thread_cache_size = 10 query_cache_size = 64M query_cache_limit = 2M thread_stack = 240K tmp_table_size = 64M slow_query_log expire_logs_days = 14 log-bin = mysql-bin character-set-server=utf8 collation-server=utf8_general_ci #*** MyISAM Specific options key_buffer_size = 32M bulk_insert_buffer_size = 64M myisam_sort_buffer_size = 128M myisam_max_sort_file_size = 10G myisam_repair_threads = 1 myisam_recover # *** INNODB Specific options *** #innodb_fatal_semaphore_wait_threshold = 6000 #tried that, didn't help #innodb_adaptive_hash_index = 0 #tried that (suggested in some stack overflow post, didn't help) innodb_buffer_pool_size = 2G innodb_data_file_path = ibdata1:10M:autoextend innodb_write_io_threads = 8 innodb_read_io_threads = 8 innodb_thread_concurrency = 16 innodb_log_buffer_size = 8M innodb_log_file_size = 256M innodb_log_files_in_group = 3 innodb_max_dirty_pages_pct = 10 innodb_io_capacity = 2000 innodb_lock_wait_timeout = 120 [mysql] no-auto-rehash [myisamchk] key_buffer_size = 512M sort_buffer_size = 512M read_buffer = 8M write_buffer = 8M [mysqld_safe] open-files-limit = 8192

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[Maria-discuss] MariaDB Developers Unconference next week
by Otto Kekäläinen 22 Jun '18

22 Jun '18

Hello everybody! If you plan to attend the MariaDB Developers Unconference and related activities next week,* make sure you have signed up <https://www.meetup.com/MariaDB-Developers/events/249024232/> to the meetup* . We will soon be posting important information to attendees and only people who have signed up will receive it. Info: - www.meetup.com/MariaDB-Developers/events/249024232/ <https://www.meetup.com/MariaDB-Developers/events/249024232/> - mariadb.org/2018-2-developers-unconference-in-finland/ - mariadb.org/travel-tips-to-tampere-finland/

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[Maria-discuss] MariaDB files wiped out after reboot
by Allan Mendoza 20 Jun '18

20 Jun '18

Hi, Good Day! I have a weird experience on one of our mysql servers. After a reboot all the database files have been wiped out. May I know if someone had expereienced the same, My OS is Centos 6.9 and MariaDB version is 5.5.35 Attaching is the error log that we have salvaged after the reboot. Thank you lanz_s99zx :)

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Re: [Maria-discuss] Chewing Through Swap - Swappiness = 0
by Michael Caplan 15 Jun '18

15 Jun '18

Just found this interesting article on the "The MySQL 'swap insanity' problem": https://blog.jcole.us/2010/09/28/mysql-swap-insanity-and-the-numa-architect… Has anyone else tried the mentioned solutions? - Forcing interleaved allocation with numactl --interleave=all. - Flushing Linux’s buffer caches just before mysqld startup with sysctl -q -w vm.drop_caches=3. - Forcing the OS to allocate InnoDB’s buffer pool immediately upon startup, using MAP_POPULATE where supported (Linux 2.6.23+), and falling back to memset otherwise. One of the solutions seems dependent on the Twitter fork that was absorbed by the now removed XtraDB. Thanks, Mike On 2018-06-15 08:24 AM, Michael Caplan wrote: > Hi, > > I'm trying to figure out why my recently put into production MariaDB > is so swap hungry. > > I'm running 10.2.14, with roughly 300GB data (1000K +/- tables). 95% > tables are innodb. I have 64GB RAM, with INNODB buffer pool size set > to 50GB (full my.cnf below). The OS is Ubuntu 16.04.4. This is a > dedicated MariaDB server. > > I have swappiness set to 0. > > I started with available swap set to just shy of 1GB. When swap got > to 85% used, I bumped swap to 3GB. A day later, swap again was 85% > used, and I bumped it to 5GB. A day later, swap again was 85% used, > so I bumped it to 15GB. 2 days later 50% of the available swap was > used. I restarted the DB moments ago, freeing up all 15GB but 128MB > of swap: > > total used free shared buff/cache > available > Mem: 62G 20G 4.7G 266M 37G 41G > Swap: 14G 128M 14G > > My understanding is that the OS should never allocate swap when > swappiness is 0, so that has me confused. > > > I've had similar issues with MySQL 5.6 (what I upgraded from) dipping > into swap, but that instance had swappiness set to 1, and never > consumed more than 5GB of swap. > > > Questions: > > 1) How much of this is an OS issue vs MariaDB issue? > > 2) What MariaDB config vars should I be looking at to fix this issue? > > 3) What linux config vars should I be looking at to fix this issue? > > > Thanks, > > Mike > > > > [mysqld] > > # GENERAL # > user = mysql > default-storage-engine = InnoDB > character-set-server = utf8 > collation_server = utf8_general_ci > performance_schema = 0 > max_allowed_packet = 16777216 > sql_mode = > "NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION" > > # MyISAM # > key-buffer-size = 32M > myisam-recover = FORCE,BACKUP > > # SAFETY # > max-allowed-packet = 16777216 > max-connect-errors = 1000000 > skip-name-resolve > sysdate-is-now = 1 > innodb = FORCE > local_infile = 0 > secure_auth = 1 > safe_user_create = 1 > skip_symbolic_links = 1 > wait_timeout = 28800 > > # DATA STORAGE # > datadir = /var/lib/mysql/ > > # BINARY LOGGING # > log-bin = /var/lib/mysql/mysql-bin > binlog_format = MIXED > server-id = 3 > expire-logs-days = 7 > sync-binlog = 1 > > # REPLICATION # > read-only = 1 > skip-slave-start = 1 > log-slave-updates = 1 > relay-log = /var/lib/mysql/relay-bin > slave-net-timeout = 60 > sync-master-info = 1 > sync-relay-log = 1 > sync-relay-log-info = 1 > > # CACHES AND LIMITS # > tmp-table-size = 32M > max-heap-table-size = 32M > query-cache-type = 0 > query-cache-size = 0 > max-connections = 500 > thread-cache-size = 50 > open-files-limit = 65535 > table-definition-cache = 4096 > table-open-cache = 10240 > > # INNODB # > innodb-flush-method = O_DIRECT > innodb-log-files-in-group = 2 > innodb-log-file-size = 512M > innodb-flush-log-at-trx-commit = 2 > innodb-file-per-table = 1 > innodb-buffer-pool-size = 50G > >

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[Maria-discuss] Timezones Table
by Kurniadi Asrigo 12 Jun '18

12 Jun '18

Hi, I am following the instruction to update the timezone table from MySQL: https://mariadb.com/kb/en/library/time-zones/ And the file is downloaded from MySQL page. I got MariaDB from XAMPP, running on Window10. I downloaded the "timezone_2018e_posix_sql.zip<https://downloads.mysql.com/general/timezone_2018e_posix_sql.zip> - POSIX standard" https://dev.mysql.com/doc/refman/5.5/en/time-zone-support.html Once downloaded, I extracted the package into a directory. From the instruction, I executed the command: .\mysql_tzinfo_to_sql.exe C:\dev\xampp_download\timezone\timezone_posix.sql | .\mysql.exe -D mysql -u root -p Now, the timezone Table is all empty. I am wondering if I am missing a step or an option. Thanks, Ti.

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[Maria-discuss] MariaDB Developers Unconference in a few weeks!
by Otto Kekäläinen 09 Jun '18

09 Jun '18

Hello everybody! The next developers unconference will be in a few weeks: https://mariadb.org/2018-2-developers-unconference-in-finland/ There are still open slots so we encourage you to sign up now. https://www.meetup.com/MariaDB-Developers/events/249024232/ We have plenty of break-out rooms this time and there is space, so we also encourage you to suggest sessions/discussions you would like to have to ian(a)mariadb.org. Around mid-summer is a great time to visit Finland. The nights that don't get dark are worth experiencing! Getting to the venue in Tampere., Finlnd is also very easy. https://mariadb.org/travel-tips-to-tampere-finland/#why-visit Hope to see you there! - Otto

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[Maria-discuss] Upgrade paths through more major versions
by Michal Schorm 06 Jun '18

06 Jun '18

Hello, MariaDB changed its release cycle to 1 major version / year. However the upgrades remained supported only from one major version to the very next. I see a raise of users (of RH products - RHEL and RHSCL mainly) that would like to jump several versions. They had an application build on, let's say, 5.5 (RHEL7 default) and would like to get the features from 10.2 (available in RH software collections - we provide plenty of versions this way). So far, they have to upgrade one by one 5.5->10.0->10.1->10.2; and solve the conflicts at each stage. Lately, we discontinued support fo 10.0 in RHSCL, which means, the upgrade path metioned above won't be as easy anymore. Also mysqldump can't be used for upgrade to 10.3, which is IMHO frequently used. For other RH products, there is an ongoing discussions, whether support all major releases or if to skip some. Which implies the questions about the upgrades through versions we wouldn't pack. However skipping several versions is IMHO quite normal for products with slow release cycle, like RHEL, so I'd expect other companies providing similar systems / products with slow release cycle to face the same problems. Are there any plans to extend the upgrade paths through more versions? Have you encountered simmilar needs of the users? -- Michal Schorm Associate Software Engineer Core Services - Databases Team Red Hat

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[Maria-discuss] Why MyISAM as default engine for system tables ?
by Julien Muchembled 06 Jun '18

06 Jun '18

Hello, A few weeks ago, we got the following fatal error when starting mariadb: [Note] Starting crash recovery... [Note] Crash recovery finished. [ERROR] mysqld: Table './mysql/db' is marked as crashed and should be repaired [Warning] Checking table: './mysql/db' [ERROR] mysql.db: 1 client is using or hasn't closed the table properly tch value count at row 1 [ERROR] Aborting Unfortunately, what led to this is unclear. We only rebooted the machine. Maybe a hw raid issue. We did a copy at that time. I tried recently if it could be repaired but I don't have the a fatal error anymore. We also don't know why system tables were touched during the reboot. Anyway, given the description of Aria ("Crash-safe tables with MyISAM heritage"), I understand that MyISAM is not crash-safe. Then, why keep using MyISAM as default engine for system tables, when MariaDB has Aria or InnoDB ? Not sure a crash-safe engine would have helped in the above case (there's no miracle for data corruption). But we'd like at least that all our mariadb setups are crash-safe (e.g. power cuts) and we use InnoDB partly for that. And I don't know if a InnoDB DB could be always recoverable if the 'mysql' DB is lost but we don't want to do manually (and learn how to) what the machine can do automatically. Julien

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[Maria-discuss] Python 3 Handler Socket
by Roberto Spadim 28 May '18

28 May '18

Hi guys! Any link to a working handler socket python module? pyhs is old and working only with python2, we need to update the C lib or use plain python with python3 (i did some changes, don't know if there's a running job on this) -- Roberto Spadim

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