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[Maria-discuss] Twitter handles of technical MariaDB guys
by Lukas Lehner 15 May '15

15 May '15

Hi You can recommend me Twitter handles of technical MariaDB guys? I wish to learn, I have immediate DB skills. Lukas

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Re: [Maria-discuss] Innodb Page Compression
by Rhys Campbell 14 May '15

14 May '15

Hi Jan, Just a follow up on my previous email. I understood that simply changing the setting for innodb_compression_algorithm would not change any existing tables. Between each test I was running the employees.sql script from the example database. This contains the following sql at the start of the script…. DROP TABLE IF EXISTS dept_emp, dept_manager, titles, salaries, employees, departments; So I definitely think there’s something up here. I’ve performed a similar set of tests below… SET GLOBAL innodb_compression_algorithm=none; source employees.sql du –sh /var/lib/mysql/employees – 385M <- Note all tables are created here with the PAGE_COMPRESSED=1 option. INNODB_SYS_TABLESPACES shows all are Barrcacuda/Dynamic Next I run the ALTER TABLE … ROW_FORMAT=COMPRESSED PAGE_COMPRESSED=DEFAULT; for each table in the employees database du –sh /var/lib/mysql/employees – 135MB; <- Expected 119MB here, probably due to a log file. SET GLOBAL innodb_compression_algorithm=zlib <- After each compression algorithm change I run alter for each tables as above du –sh /var/lib/mysql/employees – 119MB SET GLOBAL innodb_compression_algorithm=lzo <- Alter run du –sh /var/lib/mysql/employees – 119MB SET GLOBAL innodb_compression_algorithm=lz4 <- Alter run… du –sh /var/lib/mysql/employees – 119MB SET GLOBAL innodb_compression_algorithm=lzma <- alter run du –sh /var/lib/mysql/employees – 119MB SET GLOBAL innodb_compression_algorithm=bzip2 < alter run du –sh /var/lib/mysql/employees – 119MB SET GLOBAL innodb_compression_algorithm=snappy <- alter run du –sh /var/lib/mysql/employees – 119MB SET GLOBAL innodb_use_trim=1; # Now set trim and run above tests again SET GLOBAL innodb_compression_algorithm=zlib # Again the alter table statements are executed as above du –sh /var/lib/mysql/employees – 119MB SET GLOBAL innodb_compression_algorithm=lzo du –sh /var/lib/mysql/employees – 119MB SET GLOBAL innodb_compression_algorithm=lz4 du –sh /var/lib/mysql/employees – 119MB SET GLOBAL innodb_compression_algorithm=lzma du –sh /var/lib/mysql/employees – 119MB SET GLOBAL innodb_compression_algorithm=bzip2 du –sh /var/lib/mysql/employees – 119MB SET GLOBAL innodb_compression_algorithm=snappy du –sh /var/lib/mysql/employees – 119MB Recreating the database without the PAGE_COMPRESSED=1 options, then run ALTER TABLE … ROW_FORMAT=COMPRESSED results in a database size of 119MB. When I attempt the compression without ROW_FORMAT=COMPRESSED I get the same results as I previously poste, i.e. no difference in db size apart from when using lzma. Cheers, Rhys From: Jan Lindström [mailto:jan.lindstrom@mariadb.com] Sent: 14 May 2015 06:14 To: Rhys Campbell Cc: maria-discuss(a)lists.launchpad.net Subject: Re: [Maria-discuss] Innodb Page Compression On Wed, May 13, 2015 at 6:00 PM, Rhys Campbell <Rhys.Campbell(a)tradingscreen.com<mailto:Rhys.Campbell@tradingscreen.com>> wrote: 1. Why when trim is not used is the db size unchanged apart from lzma? SET GLOBAL innodb_compression_algorithm effects only new tables, it does not change existing tables. If you want to change compression algorithm for existing table you need to do: SET GLOBAL innodb_compression_algorithm = lzo; CREATE TABLE t1 (a int not null primary key, b char(200)) engine=innodb page_compressed =1; -- uses lzo SET GLOBAL innodb_compression_algorithm = lz4; -- no change to existing tables ALTER TABLE t1 ENGINE=InnoDB; -- noe table t1 uses compression algorithm lz4; 2. Why is the compressed size the same for all algorithms? Is the correct algorithm being used? No 3. Can I confirm which algorithm has been used for a page. I can’t see anything in information_schema Not really at the moment, I need to think about adding support for this. 4. Status variables / info schema not working? Status variables work only if pages are really compressed or decompressed see 1) 5. ALTER TABLE … PAGE_COMPRESSED = 1 doesn’t work. Must I always do a full dump & load to enable page compression? You have incorrect syntax. ALTER TABLE departments ROW_FORMAT=COMPRESSED means legacy row-compression and if departments table is page compressed you need to specify ALTER TABLE departments ROW_FORMAT=COMPRESSED PAGE_COMPRESSED=DEFAULT; 6. Lzma/9 compression is not that impressive. Is it meant to rival tokudb? (converting to tokudb results in a db size of ~ 54MB and this includes logs!) See 1) tokudb might use different version of lzma as they use bundled one. R: Jan

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Re: [Maria-discuss] Innodb Page Compression
by Rhys Campbell 14 May '15

14 May '15

Hi Jan, That’s for those answers. For #1 I was dropping and recreating all tables after each change to innodb_compression_algorithm. Cheers, Rhys From: Jan Lindström [mailto:jan.lindstrom@mariadb.com] Sent: 14 May 2015 06:14 To: Rhys Campbell Cc: maria-discuss(a)lists.launchpad.net Subject: Re: [Maria-discuss] Innodb Page Compression On Wed, May 13, 2015 at 6:00 PM, Rhys Campbell <Rhys.Campbell(a)tradingscreen.com<mailto:Rhys.Campbell@tradingscreen.com>> wrote: 1. Why when trim is not used is the db size unchanged apart from lzma? SET GLOBAL innodb_compression_algorithm effects only new tables, it does not change existing tables. If you want to change compression algorithm for existing table you need to do: SET GLOBAL innodb_compression_algorithm = lzo; CREATE TABLE t1 (a int not null primary key, b char(200)) engine=innodb page_compressed =1; -- uses lzo SET GLOBAL innodb_compression_algorithm = lz4; -- no change to existing tables ALTER TABLE t1 ENGINE=InnoDB; -- noe table t1 uses compression algorithm lz4; 2. Why is the compressed size the same for all algorithms? Is the correct algorithm being used? No 3. Can I confirm which algorithm has been used for a page. I can’t see anything in information_schema Not really at the moment, I need to think about adding support for this. 4. Status variables / info schema not working? Status variables work only if pages are really compressed or decompressed see 1) 5. ALTER TABLE … PAGE_COMPRESSED = 1 doesn’t work. Must I always do a full dump & load to enable page compression? You have incorrect syntax. ALTER TABLE departments ROW_FORMAT=COMPRESSED means legacy row-compression and if departments table is page compressed you need to specify ALTER TABLE departments ROW_FORMAT=COMPRESSED PAGE_COMPRESSED=DEFAULT; 6. Lzma/9 compression is not that impressive. Is it meant to rival tokudb? (converting to tokudb results in a db size of ~ 54MB and this includes logs!) See 1) tokudb might use different version of lzma as they use bundled one. R: Jan

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[Maria-discuss] doubt about best engine
by Roberto Spadim 13 May '15

13 May '15

hi guys, i'm with doubt about the "best" engine (best = no INSERT lag ~0.100s or less, good SELECT speed ~ 1 to 10 seconds is ok) i have two tables, they only "receive" INSERT and SELECT queries (no DELETE/UPDATE/ALTER) they increase 200MB/day and 3.000.000 rows/day my doubt is, how to have small database size and good read rate? it have ~ 104 inserts / second, but each insert is multi values like ... INSERT INTO table VALUES (),(),(),(),(),() .... in other words... today i'm using aria (it's crash safe) and i don't have problems with concurrent insert / table locks etc, my doubt is about table size and read speed with bigger database i'm considering using spider engine or any other shard system with >100GB , or maybe a big raid-6 system, server is a xeon 8core with 16GB and 2hd 500GB RAID1 SAS (>180MB/s) the client side is a C++ program that i don't have access to change and recompile it, in other words i can only change server side and load balance data table is something like: (datetime decimal(22,6),value decimal(22,6)) the SELECT code use most part of recent data ~5 DAYS, in outlier queries something near to ~1 MONTH ago ideas are wellcome -- Roberto Spadim

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[Maria-discuss] Innodb Page Compression
by Rhys Campbell 13 May '15

13 May '15

Hello All, I have compiled mariadb 10.1.4 from source to have a play with innodb page compression. Not sure if these are bug or misunderstanding on my part, probably a combination of both... I am running in a CentOS 7 x64 VirtualBox VM 10.1.4-MariaDB-wsrep. The compile support for page compression seems to have worked ok... SHOW STATUS LIKE 'innodb_have%'; [cid:image001.png@01D08D88.E9019C90] My experiments have been with the following example database... https://launchpad.net/test-db/employees-db-1/1.0.6/+download/employees_db-f… When this is loaded onto a default install of mariadb (InnoDB Antelope / no compression) The db size is... du -sh /var/lib/mysql/employees - 385MB The when I run ALTER TABLE .. ROW_FORMAT=COMPRESSED the db size is... du -sh /var/lib/mysql/employees - 119MB Next I performed a series of reloads of this database after changing the compression algorithm. Note the total db size doesn't change apart from when compression is lzma. SET GLOBAL innodb_compression_algorithm='zlib'; du -sh /var/lib/mysql/employees - 385MB SET GLOBAL innodb_compression_algorithm='lz4'; du -sh /var/lib/mysql/employees - 385MB SET GLOBAL innodb_compression_algorithm='lzo'; du -sh /var/lib/mysql/employees - 385MB SET GLOBAL innodb_compression_algorithm='lzma'; du -sh /var/lib/mysql/employees - 308MB SET GLOBAL innodb_compression_algorithm='bzip2'; du -sh /var/lib/mysql/employees - 385MB SET GLOBAL innodb_compression_algorithm='snappy'; du -sh /var/lib/mysql/employees - 385MB SET GLOBAL innodb_compression_algorithm='lzma'; SET GLOBAL innodb_compression_level=9; du -sh /var/lib/mysql/employees - 232M SET GLOBAL innodb_compression_algorithm='zlib'; SET GLOBAL innodb_compression_level=9; du -sh /var/lib/mysql/employees - 385MB Note if you then try to execute.. ALTER TABLE departments ROW_FORMAT=COMPRESSED; Table storage engine 'InnoDB' does not support the create option 'PAGE_COMPRESSED' On further reading the documentation<https://mariadb.com/kb/en/mariadb/innodbxtradb-page-compression/> I noted the "Persistent Trim" section. So I tried... SET GLOBAL innodb_compression_algorithm='zlib'; SET GLOBAL innodb_compression_level=9; SET GLOBAL innodb_use_trim=ON; du -sh /var/lib/mysql/employees - 320MB Note the db size is smaller by 65MB FYI innodb_page_compression_saved = 0 at this point. Next I tried the following settings.. vi /etc/my.cnf.d/innodb_compression.cnf innodb_file_format=Barracuda innodb_file_format_max=Barracuda innodb_compression_algorithm=zlib innodb_compression_level=9 innodb_use_trim=1 innodb_use_fallocate=1 du -sh /var/lib/mysql/employees - 232M SET GLOBAL innodb_compression_algorithm='lz4'; du -sh /var/lib/mysql/employees - 232M innodb_page_compression_saved = 0 # All other counters for SHOW STATUS LIKE '%compres%' are zero SET GLOBAL innodb_compression_algorithm='lzma'; du -sh /var/lib/mysql/employees - 232M SET GLOBAL innodb_compression_algorithm='bzip2'; du -sh /var/lib/mysql/employees - 232M SET GLOBAL innodb_compression_algorithm='snappy'; du -sh /var/lib/mysql/employees - 232M innodb_page_compression_saved = 0 # All other counters for SHOW STATUS LIKE '%compres%' are zero information_schema tables INNODB_CMP, INNODB_CMP_RESET, INNODB_CMPMEM & INNODB_CMP_RESET all zero. So I guess the questions here would be... 1. Why when trim is not used is the db size unchanged apart from lzma? 2. Why is the compressed size the same for all algorithms? Is the correct algorithm being used? 3. Can I confirm which algorithm has been used for a page. I can't see anything in information_schema 4. Status variables / info schema not working? 5. ALTER TABLE ... PAGE_COMPRESSED = 1 doesn't work. Must I always do a full dump & load to enable page compression? 6. Lzma/9 compression is not that impressive. Is it meant to rival tokudb? (converting to tokudb results in a db size of ~ 54MB and this includes logs!) Cheers, Rhys Campbell Database Administrator TradingScreen, Inc. 23 York House, 5th Floor London WC2B 6UJ Email: rhys.campbell(a)tradingscreen.com<mailto:rhys.campbell@tradingscreen.com> Follow TradingScreen on Twitter<http://twitter.com/#!/TradingScreen> , Facebook<http://www.facebook.com/pages/TradingScreen/214046251945650> and our blog Trading Smarter<tradingsmarter.tradingscreen.com> This message is intended only for the recipient(s) named above and may contain confidential information. If you are not an intended recipient, you should not review, distribute or copy this message. Please notify the sender immediately by e-mail if you have received this message in error and delete it from your system.

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[Maria-discuss] New Question: license question about libmysqlclient
by AskMonty KB 12 May '15

12 May '15

Hello, A new question has been asked in "MariaDB Connector/C" by seanhan. Please answer it at http://mariadb.com/kb/en/license-question-about-libmysqlclient/ as the person asking the question may not be subscribed to the mailing list. -------------------------------- Hi: I just downloaded and installed the mariadb-10.0.17-linux-x86_64. From the lib directory, I found the libmysqlclient.a and other related files. My question is, are they built from the native mariadb connector? Are they GPL or LGPL. Thank you!! Sean -------------------------------- To view or answer this question please visit: http://mariadb.com/kb/en/license-question-about-libmysqlclient/

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Re: [Maria-discuss] fsync necessary for synchronous page flush?
by Xiaofei Du 11 May '15

11 May '15

Hi Jan, Thanks for clarification. I should have used synchronous write, instead of synchronous flush. My point is that I noticed for sync writes, fsync is called to force pages to be on persistent storage. while for AIO pages, fsync is not called to force pages to be on persistent storage. My question here is why fsync is required for sync IOs. Does InnoDB maintain a dirty page table? Is fsync called to guarantee the page to be on persistent storage so that the dirty page table can be updated? If this is the case, when is the dirty page table updated for asynchronous IOs? P.S. I couldn't find code for dirty page table. So I am not sure if InnoDB maintains a dirty page table for recovery. Could you please give me a pointer to related code and related resources? Thanks. Xiaofei On Wed, May 6, 2015 at 10:12 AM, Jan Lindström <jan.lindstrom(a)mariadb.com> wrote: > Hi, > > Terminology is little bit confusing here. Page flushing means that we have > done synchronous write to disk but that does not mean that write is > physically on device yet, therefore there is flush to force it to > persistent storage. > > R: Jan > > On Wed, May 6, 2015 at 12:57 AM, Xiaofei Du <xiaofei.du008(a)gmail.com> > wrote: > >> Hello, >> >> When a dirty page is flushed synchronously in buf_flush_write_block_low, >> fsync is called in the following snippet. I am wondering why >> we need this fsync for synchronous flush? The record should be in >> the log already, so recovery should be able to successfully redo it >> and apply to the disk during recovery. Maybe I am missing something here, >> please let me know if I am wrong. Thanks much! >> >> Xiaofei >> >> >> /* When doing single page flushing the IO is done synchronously and we >> flush the changes to disk only for the tablespace we are working on. */ if >> (sync) { ut_ad(flush_type == BUF_FLUSH_SINGLE_PAGE); fil_flush(buf_page_get_space(bpage)); >> /* true means we want to evict this page from the LRU list as well. */ >> buf_page_io_complete(bpage, true); } >> >> _______________________________________________ >> Mailing list: https://launchpad.net/~maria-discuss >> Post to : maria-discuss(a)lists.launchpad.net >> Unsubscribe : https://launchpad.net/~maria-discuss >> More help : https://help.launchpad.net/ListHelp >> >> >

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[Maria-discuss] New Question: MariaDb Crashing after some wordpress posts
by AskMonty KB 10 May '15

10 May '15

Hello, A new question has been asked in "MariaDB Community" by nunocarapito. Please answer it at http://mariadb.com/kb/en/mariadb-crashing-after-some-wordpress-posts/ as the person asking the question may not be subscribed to the mailing list. -------------------------------- Hi there. I have 2 wordpress blogs in a host, both using mariaDB. Sometimes when I add a new post, DB crashes, and can't find the reason of that. I got a screenshot of the log (mariadb.log). http://i.imgur.com/fiwA7VE.png?1 I cant find out the reason of it. Can you guys give me any help? -------------------------------- To view or answer this question please visit: http://mariadb.com/kb/en/mariadb-crashing-after-some-wordpress-posts/

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[Maria-discuss] How to unsibscribe
by Vadim Pestovnikov 10 May '15

10 May '15

Hi all, Could you please advice me how to unsibscribe from this mailing list? Unfortunately folowing by this link Unsubscribe : https://launchpad.net/~maria-discuss I couldn't find how to do it. Thank you in advance.

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[Maria-discuss] MariaDB 10.0.19 now available
by Daniel Bartholomew 09 May '15

09 May '15

The MariaDB project is pleased to announce the immediate availability of MariaDB 10.0.19. This is a Stable (GA) release. See the Release Notes and Changelog for details. - - Links - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - MariaDB 10.0.19 - Release Notes: https://mariadb.com/kb/en/mariadb-10019-release-notes - Changelog: https://mariadb.com/kb/en/mariadb-10019-changelog - Downloads: https://downloads.mariadb.org/mariadb/10.0.19 About MariaDB 10.0: - https://mariadb.com/kb/en/what-is-mariadb-100/ APT and YUM Repository Configuration Generator: - https://downloads.mariadb.org/mariadb/repositories/ - - MariaDB Webinars - - - - - - - - - - - - - - - - - - - - - - - - - There are several upcoming MariaDB-focused webinars and many previously held ones available to watch on an on-demand basis at: - https://mariadb.com/news-events/webinars - - 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://mariadb.org/jira - - 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/en/donate/ We hope you enjoy MariaDB! -- MariaDB Website - http://mariadb.org Twitter - http://twitter.com/mariadb Google+ - http://google.com/+mariadb Facebook - http://fb.com/MariaDB.dbms Knowledge Base - http://mariadb.com/kb

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[Maria-discuss] MariaDB 10.0.18 now available
by Daniel Bartholomew 08 May '15

08 May '15

The MariaDB project is pleased to announce the immediate availability of MariaDB 10.0.18. This is a Stable (GA) release. See the Release Notes and Changelog for details. - - Links - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - MariaDB 10.0.18 - Release Notes: https://mariadb.com/kb/en/mariadb-10018-release-notes - Changelog: https://mariadb.com/kb/en/mariadb-10018-changelog - Downloads: https://downloads.mariadb.org/mariadb/10.0.18 About MariaDB 10.0: - https://mariadb.com/kb/en/what-is-mariadb-100/ APT and YUM Repository Configuration Generator: - https://downloads.mariadb.org/mariadb/repositories/ - - MariaDB Webinars - - - - - - - - - - - - - - - - - - - - - - - - - There are several upcoming MariaDB-focused webinars and many previously held ones available to watch on an on-demand basis at: - https://mariadb.com/news-events/webinars - - 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://mariadb.org/jira - - 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/en/donate/ We hope you enjoy MariaDB! -- MariaDB Website - http://mariadb.org Twitter - http://twitter.com/mariadb Google+ - http://google.com/+mariadb Facebook - http://fb.com/MariaDB.dbms Knowledge Base - http://mariadb.com/kb

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[Maria-discuss] innodb_file_per_table default setting in the online documentation
by Pantelis Theodosiou 08 May '15

08 May '15

I was looking for the default setting of this variable and the MariaDB documentation <https://mariadb.com/kb/en/mariadb/xtradbinnodb-server-system-variables/#inn…> has: > *Default Value:* OFF (>= MariaDB/MySQL 5.5.7), ON (MariaDB/MySQL 5.5.0 to 5.5.6) while MySQL documentation <http://dev.mysql.com/doc/refman/5.6/en/innodb-parameters.html#sysvar_innodb…> has (I think correctly): *Permitted Values* (<= 5.6.5) *Type* boolean* Default *OFF *Permitted Values* (>= 5.6.6) *Type *boolean* Default *ON So, I see two issues: - first, the changing version is 5.6.6 (not 5.5.7), at least in MySQL, and - second, the values OFF / ON in the Maria documentation are reversed. Apologies if this is not the correct list to raise the issue. Pantelis Theodosiou

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[Maria-discuss] New Question: Multi Master Replication and Skip Error
by AskMonty KB 07 May '15

07 May '15

Hello, A new question has been asked in "MariaDB Community" by markwass. Please answer it at http://mariadb.com/kb/en/multi-master-replication-and-skip-error/ as the person asking the question may not be subscribed to the mailing list. -------------------------------- Hi Guys I have 3 MariaDB 10 servers all running on Ubuntu 14.04 in a multi master replication setup. I had an issue the other day with replication where one of my slaves was asking me to run "SET GLOBAL sql_slave_skip_counter=1; start slave;" After running the command it did not fix the issue. So I tried "stop all slaves; SET GLOBAL sql_slave_skip_counter=1; start all slaves;" and still the issue was there. I'm wondering if it's because I'm using GlobaI Transaction ID's? Using_Gtid: Slave_Pos If this is the case then can some one explain to me how I would over come this replication error while using Global Transaction ID's? Thanks -------------------------------- To view or answer this question please visit: http://mariadb.com/kb/en/multi-master-replication-and-skip-error/

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Re: [Maria-discuss] fsync necessary for synchronous page flush?
by Xiaofei Du 07 May '15

07 May '15

Hi Jan, The only place fsync is called after AIO that I could find is in function buf_LRU_remove_pages (buf0lru.cc) But after other AIO operations, I didn't see fsync is called. Do you know how this difference will affect the recovery process? Thanks. Xiaofei On Wed, May 6, 2015 at 8:24 PM, Jan Lindström <jan.lindstrom(a)mariadb.com> wrote: > Hi, > > There is sync for AIO pages also. There is no dirty page table but > naturally dirty pages are marked and they are on LRU list see > buf/buf0lru.cc. > > R: Jan > > On Thu, May 7, 2015 at 12:23 AM, Xiaofei Du <xiaofei.du008(a)gmail.com> > wrote: > >> Hi Jan, >> >> Thanks for clarification. I should have used synchronous write, instead >> of synchronous flush. My point is that I noticed for sync writes, fsync is >> called to force pages to be on persistent storage. while for AIO pages, >> fsync is not called to force pages to be on persistent storage. My question >> here is why fsync is required for sync IOs. Does InnoDB maintain a dirty >> page table? Is fsync called to guarantee the page to be on persistent >> storage so that the dirty page table can be updated? If this is the case, >> when is the dirty page table updated for asynchronous IOs? >> >> P.S. I couldn't find code for dirty page table. So I am not sure if >> InnoDB maintains a dirty page table for recovery. Could you please give me >> a pointer to related code and related resources? Thanks. >> >> Xiaofei >> >> On Wed, May 6, 2015 at 10:12 AM, Jan Lindström <jan.lindstrom(a)mariadb.com >> > wrote: >> >>> Hi, >>> >>> Terminology is little bit confusing here. Page flushing means that we >>> have done synchronous write to disk but that does not mean that write is >>> physically on device yet, therefore there is flush to force it to >>> persistent storage. >>> >>> R: Jan >>> >>> On Wed, May 6, 2015 at 12:57 AM, Xiaofei Du <xiaofei.du008(a)gmail.com> >>> wrote: >>> >>>> Hello, >>>> >>>> When a dirty page is flushed synchronously in buf_flush_write_block_low >>>> , >>>> fsync is called in the following snippet. I am wondering why >>>> we need this fsync for synchronous flush? The record should be in >>>> the log already, so recovery should be able to successfully redo it >>>> and apply to the disk during recovery. Maybe I am missing something >>>> here, >>>> please let me know if I am wrong. Thanks much! >>>> >>>> Xiaofei >>>> >>>> >>>> /* When doing single page flushing the IO is done synchronously and we >>>> flush the changes to disk only for the tablespace we are working on. */ if >>>> (sync) { ut_ad(flush_type == BUF_FLUSH_SINGLE_PAGE); fil_flush(buf_page_get_space(bpage)); >>>> /* true means we want to evict this page from the LRU list as well. */ >>>> buf_page_io_complete(bpage, true); } >>>> >>>> _______________________________________________ >>>> Mailing list: https://launchpad.net/~maria-discuss >>>> Post to : maria-discuss(a)lists.launchpad.net >>>> Unsubscribe : https://launchpad.net/~maria-discuss >>>> More help : https://help.launchpad.net/ListHelp >>>> >>>> >>> >> >

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[Maria-discuss] fsync necessary for synchronous page flush?
by Xiaofei Du 05 May '15

05 May '15

Hello, When a dirty page is flushed synchronously in buf_flush_write_block_low, fsync is called in the following snippet. I am wondering why we need this fsync for synchronous flush? The record should be in the log already, so recovery should be able to successfully redo it and apply to the disk during recovery. Maybe I am missing something here, please let me know if I am wrong. Thanks much! Xiaofei /* When doing single page flushing the IO is done synchronously and we flush the changes to disk only for the tablespace we are working on. */ if (sync) { ut_ad(flush_type == BUF_FLUSH_SINGLE_PAGE); fil_flush(buf_page_get_space(bpage)); /* true means we want to evict this page from the LRU list as well. */ buf_page_io_complete(bpage, true); }

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[Maria-discuss] MariaDB 10 multi-source replciation with SSL enabled
by Vadim Pestovnikov 05 May '15

05 May '15

Hi all, I am having a replication issue with MariaDB 10 using multi-source replication with SSL enabled. I have MariaDB 10 db in China, MariaDB 10 db in US and MariaDB 10 db in Europe. Each of them are getting data from other database sources such as Percona Server, AWS RDS using Tungsten replication because MariaDB 10 is not compatible with AWS RDS and Percona with GTID enabled. US and China MariaDB 10 servers are masters for Europe MariaDB. When I restore US and China MariaDB 10 data in Europe MariaDB 10 slave and start the replication, slave and masers are in sync. Then new data is coming to a masters from Tungsten, but slave doesn't get it. I don't see any errors neither from mysql-error.log or slave status. When I create fake tables and insert records everything replicates perfectly. What can be possible wrong with my setup? -- Vadim

1 0

[Maria-discuss] New Question: Connecting .Net with MariaDB
by AskMonty KB 05 May '15

05 May '15

Hello, A new question has been asked in "MariaDB Connector/ODBC Release Notes" by swarejg. Please answer it at http://mariadb.com/kb/en/connecting-net-with-mariadb/ as the person asking the question may not be subscribed to the mailing list. -------------------------------- Hi, I've reading about MariaDB and the way we can connect to it via .Net Can we use MySQL .Net Connector to connect MariaDB? If not, I found that you provide Connector/ODBC for use in .Net. Which are the performance results? Regards Jorge Guevara -------------------------------- To view or answer this question please visit: http://mariadb.com/kb/en/connecting-net-with-mariadb/

1 0

[Maria-discuss] New Question: Are there plans to support Spatial Indexes in InnoDB for the 10.1 Release?
by AskMonty KB 04 May '15

04 May '15

Hello, A new question has been asked in "Geographic Features" by johndailyjr. Please answer it at http://mariadb.com/kb/en/are-there-plans-to-support-spatial-indexes-in-inno… as the person asking the question may not be subscribed to the mailing list. -------------------------------- Are there plans to support Spatial Indexes in InnoDB/XtraDB for the 10.1 Release? I can't seem to find anything relevant in the changelogs. Thanks! John -------------------------------- To view or answer this question please visit: http://mariadb.com/kb/en/are-there-plans-to-support-spatial-indexes-in-inno…

1 0

[Maria-discuss] Password Complexity Plugin
by Adam Scott 01 May '15

01 May '15

Hi, I noticed MySQL 5.6 has a validate_password plugin. Since it's open-source, can we add it to MariaDB 5.5. Or is that bad form, a hot potato, etc.? We need the features of this plugin in our environment, and the PAM integration is looking not a good "fit" (though it's working great). (I'm trying to get it to compile in right now, but it's having issues with the includes so far...working on it). Thanks, Adam C. Scott

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[Maria-discuss] New Question: Cannot increase open-files-limit
by AskMonty KB 01 May '15

01 May '15

Hello, A new question has been asked in "Managing MariaDB" by raquel.j. Please answer it at http://mariadb.com/kb/en/cannot-increase-open-files-limit/ as the person asking the question may not be subscribed to the mailing list. -------------------------------- I have a LEMP stack on Ubuntu 14.04 with 10.0.17-MariaDB-1~trusty. Mysql is a huge bottleneck for my server. I have tried everything of which I am aware to raise the open files limit for mysql. I have added "open-files-limit = 2097152" to my.cnf. I have added the following to limits.conf: * soft nofile 2097152 * hard nofile 2097152 * soft nproc 2097152 * hard nproc 2097152 mysql soft nofile 2097152 mysql hard nofile 2097152 mysql soft nproc 2097152 mysql hard nproc 2097152 I have added "session required pam_limits.so" to /etc/pam.d/common-session* and /etc/pam.d/sudo and a couple of others. I have tried restarting mysql after reboot - no change. I also checked /etc/apparmor.d/usr.sbin.mysqld to see if it was involved but the file is empty. After all that I still get the following: # ulimit -Sa core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 256538 max locked memory (kbytes, -l) unlimited max memory size (kbytes, -m) unlimited open files (-n) 1024 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 8192 cpu time (seconds, -t) unlimited max user processes (-u) 2097152 virtual memory (kbytes, -v) unlimited file locks (-x) unlimited When I run # mysqld --verbose I get this: 150501 0:19:35 [Warning] Could not increase number of max_open_files to more than 1024 Does anyone have any idea as to what is blocking this change??? -------------------------------- To view or answer this question please visit: http://mariadb.com/kb/en/cannot-increase-open-files-limit/

1 0

[Maria-discuss] MariaDB 5.5.43 now available
by Daniel Bartholomew 01 May '15

01 May '15

The MariaDB project is pleased to announce the immediate availability of MariaDB 5.5.43. This is a Stable (GA) release. See the Release Notes and Changelog for details. - - Links - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - MariaDB 5.5.43 - Release Notes: https://mariadb.com/kb/en/mariadb-5543-release-notes - Changelog: https://mariadb.com/kb/en/mariadb-5543-changelog - Downloads: https://downloads.mariadb.org/mariadb/5.5.43 About MariaDB 5.5: - https://mariadb.com/kb/en/what-is-mariadb-55/ APT and YUM Repository Configuration Generator: - https://downloads.mariadb.org/mariadb/repositories/ - - MariaDB Webinars - - - - - - - - - - - - - - - - - - - - - - - - - There are several upcoming MariaDB-focused webinars and many previously held ones available to watch on an on-demand basis at: - https://mariadb.com/news-events/webinars - - 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://mariadb.org/jira - - 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/en/donate/ We hope you enjoy MariaDB! -- MariaDB Website - http://mariadb.org Twitter - http://twitter.com/mariadb Google+ - http://google.com/+mariadb Facebook - http://fb.com/MariaDB.dbms Knowledge Base - http://mariadb.com/kb

1 0

[Maria-discuss] R: Re: issue with 2 node cluster
by absolutely_free＠libero.it 30 Apr '15

30 Apr '15

Hi Alexey, thank you for your reply. Yes I am using wsrep_sst_method="xtrabackup-v2" Should I simply delete ALL from /var/lib/mysql/* and restart mysql again? Thank you again. >----Messaggio originale---- >Da: alexey.yurchenko(a)galeracluster.com >Data: 30/04/2015 15.09 >A: <absolutely_free(a)libero.it> >Cc: <maria-discuss(a)lists.launchpad.net>, "Maria-discuss"<maria-discuss- bounces+alexey.yurchenko=codership.com(a)lists.launchpad.net> >Ogg: Re: [Maria-discuss] issue with 2 node cluster > >On 2015-04-30 15:13, absolutely_free(a)libero.it wrote: >> Hi, >> I have 2 mariadb nodes on Debian 7.8. >> After a crash on first node, I can't restart the second one. > >> how can I solve this issue? >> First node is ok, all databases are available. >> Thank you > >It depends. If you are using rsync or xtrabackup SST method, you can >just delete everything from the data directory. >

1 0

[Maria-discuss] issue with 2 node cluster
by absolutely_free＠libero.it 30 Apr '15

30 Apr '15

Hi, I have 2 mariadb nodes on Debian 7.8. After a crash on first node, I can't restart the second one. The message I see in /var/log/mysql/error.log is: 150430 12:55:48 InnoDB: Database was not shut down normally! InnoDB: Starting crash recovery. InnoDB: Reading tablespace information from the .ibd files... InnoDB: Restoring possible half-written data pages from the doublewrite InnoDB: buffer... 150430 12:55:48 InnoDB: Error: page 7 log sequence number 565808461991 InnoDB: is in the future! Current system log sequence number 565772838412. InnoDB: Your database may be corrupt or you may have copied the InnoDB InnoDB: tablespace but not the InnoDB log files. See InnoDB: http://dev.mysql.com/doc/refman/5.5/en/forcing-innodb-recovery.html InnoDB: for more information. 150430 12:55:48 InnoDB: Error: page 2 log sequence number 565929024045 InnoDB: is in the future! Current system log sequence number 565772838412. InnoDB: Your database may be corrupt or you may have copied the InnoDB InnoDB: tablespace but not the InnoDB log files. See InnoDB: http://dev.mysql.com/doc/refman/5.5/en/forcing-innodb-recovery.html InnoDB: for more information. .. .. InnoDB: We intentionally generate a memory trap. InnoDB: Submit a detailed bug report to http://bugs.mysql.com. InnoDB: If you get repeated assertion failures or crashes, even InnoDB: immediately after the mysqld startup, there may be InnoDB: corruption in the InnoDB tablespace. Please refer to InnoDB: http://dev.mysql.com/doc/refman/5.5/en/forcing-innodb-recovery.html InnoDB: about forcing recovery. 150430 12:55:48 [ERROR] mysqld got signal 6 ; This could be because you hit a bug. It is also possible that this binary or one of the libraries it was linked against is corrupt, improperly built, or misconfigured. This error can also be caused by malfunctioning hardware. To report this bug, see http://kb.askmonty.org/en/reporting-bugs We will try our best to scrape up some info that will hopefully help diagnose the problem, but since we have already crashed, something is definitely wrong and this may fail. Server version: 5.5.42-MariaDB-1~wheezy-wsrep-log key_buffer_size=134217728 read_buffer_size=2097152 max_used_connections=0 max_threads=4098 thread_count=0 It is possible that mysqld could use up to key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 25383890 K bytes of memory Hope that's ok; if not, decrease some variables in the equation. Thread pointer: 0x0x0 Attempting backtrace. You can use the following information to find out where mysqld died. If you see no messages after this, something went terribly wrong... stack_bottom = 0x0 thread_stack 0x30000 /usr/sbin/mysqld(my_print_stacktrace+0x2b)[0x7f3cc9d0c53b] /usr/sbin/mysqld(handle_fatal_signal+0x422)[0x7f3cc993a4f2] /lib/x86_64-linux-gnu/libpthread.so.0(+0xf0a0)[0x7f3cc900f0a0] /lib/x86_64-linux-gnu/libc.so.6(gsignal+0x35)[0x7f3cc786c165] /lib/x86_64-linux-gnu/libc.so.6(abort+0x180)[0x7f3cc786f3e0] /usr/sbin/mysqld(+0x73b5dc)[0x7f3cc9b795dc] /usr/sbin/mysqld(+0x709617)[0x7f3cc9b47617] /usr/sbin/mysqld(+0x70a41a)[0x7f3cc9b4841a] /usr/sbin/mysqld(+0x6f25d8)[0x7f3cc9b305d8] /usr/sbin/mysqld(+0x6c4733)[0x7f3cc9b02733] /usr/sbin/mysqld(+0x6b72d2)[0x7f3cc9af52d2] /usr/sbin/mysqld(+0x6b812c)[0x7f3cc9af612c] /usr/sbin/mysqld(+0x6bad41)[0x7f3cc9af8d41] /usr/sbin/mysqld(+0x6a3db5)[0x7f3cc9ae1db5] /usr/sbin/mysqld(+0x659d1f)[0x7f3cc9a97d1f] /usr/sbin/mysqld(_Z24ha_initialize_handlertonP13st_plugin_int+0x48)[0x7f3cc993ce78] /usr/sbin/mysqld(+0x3bb550)[0x7f3cc97f9550] /usr/sbin/mysqld(_Z11plugin_initPiPPci+0x652)[0x7f3cc97fa592] /usr/sbin/mysqld(+0x32b118)[0x7f3cc9769118] /usr/sbin/mysqld(_Z11mysqld_mainiPPc+0x2036)[0x7f3cc976b9b6] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xfd)[0x7f3cc7858ead] /usr/sbin/mysqld(+0x321a4d)[0x7f3cc975fa4d] The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains information that should help you find out what is causing the crash.' how can I solve this issue? First node is ok, all databases are available. Thank you

1 0

[Maria-discuss] New Question: Licensing of Mariadb connector/C
by AskMonty KB 30 Apr '15

30 Apr '15

Hello, A new question has been asked in "MariaDB Connector/C" by kmrsankar. Please answer it at http://mariadb.com/kb/en/licensing-of-mariadb-connectorc/ as the person asking the question may not be subscribed to the mailing list. -------------------------------- hi, I have downloaded the source and binary of Maria DB Connector/C library. I see that one of the files mysql_async.h has a GPL license in it. But as such the whole library was declared as LGPL. Is this single GPL license header contaminates this library ? Thanks, Muthu -------------------------------- To view or answer this question please visit: http://mariadb.com/kb/en/licensing-of-mariadb-connectorc/

1 0

[Maria-discuss] Calculating memory consumption for MariaDB in Munin plugin
by Anna Jonna Armannsdottir 30 Apr '15

30 Apr '15

Hello, I am new to this list and the issue I am presenting here might surely be answered on the development list, but I do not want to impose this issue on the developers, I just hope some of them listen here. There seems to be general aggreement on the calculation of memory consumption for MariaDB and MySQL. There is however an insignificant dispute but very important dispute over the role of tmp_table_size . https://mariadb.com/kb/en/mariadb/server-system-variables/#tmp_table_size The dispute is whether tmp_table_size is a session variable or a kind of global variable. Thus MariaDB memory consumption is calculated as: max_connections * (sum of session variables) + (global variables) Thus if tmp_table_size is considered to be a session variable, it will be multiplied by max_connections . In my config the settings are: max-connections = 1000 tmp-table-size = 32M max-heap-table-size = 32M In my case this means that MariaDB could consume 1000 + 32M + 1000 + (sum of sess.var.) + (global variables) . This point of view was put forward in a discussion on mysql.com: QUOTE: > I disagree with how the previous comment handles the tmp_table_size > value. They treat it as a single allocation on the global scope when > for memory consumption purposes it is more in line with a per thread > buffer. > > A single connection/query can use a single or multiple temporary > tables in the duration of its processing. The connections do not use a > single temporary table "area" reserved just for that purpose. > > If you are going to use a formula for memory consumption, the > tmp_table-size should be located with the other per thread buffers - > not in the single allocation listing. https://dev.mysql.com/doc/refman/5.0/en/memory-use.html I honestly do not believe, this the case. On this discussion list we have examples that have tmp_table_size = 256 MB and max-connections = 1000 . 256 Gigabytes!!! https://lists.launchpad.net/maria-discuss/msg02376.html On the other hand we have sites like: http://www.mysqlcalculator.com/ This site calculates memory consumption in a way I find more agreeable, by not multiplying tmp_table_size by max_connections. This is an issue in a Munin monitoring plugin that reports mysql connection memory. The calculation code is from lines 1941 to 1949. https://github.com/munin-monitoring/munin/blob/devel/plugins/node.d/mysql_ $data->{'mysql_connection_memory'} = $data->{'read_buffer_size'} + $data->{'read_rnd_buffer_size'} + $data->{'sort_buffer_size'} + $data->{'join_buffer_size'} + $data->{'binlog_cache_size'} + $data->{'thread_stack'} + ( $tmp_table_size >= $max_heap_table_size ? $tmp_table_size : $max_heap_table_size ) + ( $data->{'tokudb_read_buf_size'} || 0 ); # wsrep_thread_count was separated from max_connections for mariadb-5.5.38 https://mariadb.atlassian.net/browse/MDEV-6206 $data->{'mysql_connection_memory'} *= $data->{'max_connections'} + ( $data->{'wsrep_thread_count'} || 0 ); I ask for your opinion and support for correcting this issue, so that we may get correct reports in Munin. -- Anna Jonna Armannsdottir <annaj(a)hi.is> University of Iceland Computing Services -- Anna Jonna Armannsdottir <annajonna(a)gmail.com>

2 1

[Maria-discuss] Simple Password Check plugin Backported to 5.5
by Adam Scott 30 Apr '15

30 Apr '15

It's taken some time, but I have backported the simple_password_check plugin and the password api to MariaDB 5.5 The mysql-test is succeeding on all but the test of the strict_password_validation variable. My question is, should a pure backport include support for strict_password_validation variable ( https://mariadb.com/kb/en/mariadb/server-system-variables/#strict_password_…) ? I suspect yes, but wanted to ask to start a further discussion: namely if I submit this patch will it be included in future MariaDB 5.5 releases? It will help customer enforce password complexity beneficial for security auditing. Let me know and I'll submit patch or submit via recommended method. Thank you, Adam Scott p.s. I sent this message on Apr 27 as a reply to the mailing lists for a thread started back in January, but I haven't seen my reply show up in the public archive. Colin suggested I let you know when I have backported the plugin.

1 0

[Maria-discuss] user map auth plugin
by Felipe Gasper 29 Apr '15

29 Apr '15

So, I recently wrote an auth plugin with the intent of implementing a simple user map, authenticated against the hashed password that would be retrieved via the normal password entry scheme. I got far too far along before realizing that this scheme basically requires that either the client use a plugin to communicate with the server auth plugin, or I use the old MySQL auth plugin. ...or is there some way to re-initialize secure MySQL auth from the server auth plugin?? It would really shoot my intents in the gut if every client that wants to log in with user mapping needs to be 5.5+ and to have a plugin...:-( -FG Sent from my android device.

2 1

[Maria-discuss] Moderator: please REMOVE ME
by grantksupport＠operamail.com 29 Apr '15

29 Apr '15

I deleted my launchpad account. Still getting emails from this ML. Can't re-subscribe to launchpad to unsubscribe from the ML. Catch22 ... Could a kindly Moderator please REMOVE ME? Thx.

2 1

[Maria-discuss] UNSUBSCRIBE
by grantksupport＠operamail.com 29 Apr '15

29 Apr '15

2 1

[Maria-discuss] New Question: How to specify the options when using cmake?
by AskMonty KB 29 Apr '15

29 Apr '15

Hello, A new question has been asked in "General FAQ" by fjjiaboming. Please answer it at http://mariadb.com/kb/en/how-to-specify-the-options-when-using-cmake/ as the person asking the question may not be subscribed to the mailing list. -------------------------------- http://www.linuxfromscratch.org/blfs/view/7.7/server/mariadb.html I build MariaDB 10.0.17 with cmake-3 , libevent-2 , python-2 ... Dependencies all are in dir /opt/.. But , how can I specify the modules dir for MariaDB ? `` cmake-3... -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/opt/mariadb-10.0.17 -DINSTALL_DOCDIR=share/doc/mariadb-10.0.17 -DINSTALL_DOCREADMEDIR=share/doc/mariadb-10.0.17 -DINSTALL_MANDIR=share/man -DINSTALL_MYSQLSHAREDIR=share/mysql -DINSTALL_MYSQLTESTDIR=share/mysql/test -DINSTALL_PLUGINDIR=lib/mysql/plugin -DINSTALL_SBINDIR=sbin -DINSTALL_SCRIPTDIR=bin -DINSTALL_SQLBENCHDIR=share/mysql/bench -DINSTALL_SUPPORTFILESDIR=share/mysql -DMYSQL_DATADIR=/srv/mysql -DMYSQL_UNIX_ADDR=/srv/mysql/mysqld.sock -DWITH_EXTRA_CHARSETS=complex -DWITH_EMBEDDED_SERVER=ON -DTOKUDB_OK=0 .. `` I try to add -DWITH_LIBEVENT=/opt/libevent-2.0.22-stable -DWITH_BOOST=/opt/boost_1_58_0 ... I got some messages to tip me the options are invalid . -------------------------------- To view or answer this question please visit: http://mariadb.com/kb/en/how-to-specify-the-options-when-using-cmake/

1 0

[Maria-discuss] MariaDB finally in Debian officially (Fwd: Debian 8 "Jessie" released)
by Otto Kekäläinen 27 Apr '15

27 Apr '15

Hello! Debian 8 "Jessie" has been released to today. It is the first official Debian release that ships with MariaDB (it has MariaDB 10.0.16 and MySQL 5.5.42). MariaDB client for C (the LGPL version) is also included. Release notes[1] state that in Debian 9 only one MySQL variant will be shipped. Hopefully the decision will tip towards MariaDB. The MariaDB "request for packaging" issue[2] was opened in bugs.debian.org in 2010. I started doing MariaDB packaging for Debian in 2013. The path here has been long and I am glad that this milestone is finally reached. [1] https://www.debian.org/releases/jessie/amd64/release-notes/ch-whats-new.en.… [2] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=565308 ---------- Forwarded message ---------- From: Paul Wise <pabs(a)debian.org> Date: 2015-04-26 5:28 GMT+03:00 Subject: Debian 8 "Jessie" released To: debian-announce(a)lists.debian.org ------------------------------------------------------------------------ The Debian Project https://www.debian.org/ Debian 8 "Jessie" released press(a)debian.org April 25th, 2015 https://www.debian.org/News/2015/20150426 ------------------------------------------------------------------------ After almost 24 months of constant development the Debian project is proud to present its new stable version 8 (code name "Jessie"), which will be supported for the next 5 years thanks to the combined work of the Debian Security team [1] and of the Debian Long Term Support [2] team. 1: http://security-team.debian.org/ 2: https://wiki.debian.org/LTS "Jessie" ships with a new default init system, systemd. The systemd suite provides many exciting features such as faster boot times, cgroups for services, and the possibility of isolating part of the services. The sysvinit init system is still available in "Jessie". The UEFI ("Unified Extensible Firmware Interface") support introduced in "Wheezy" has also been greatly improved in Jessie. This includes workarounds for many known firmware bugs, support for UEFI on 32-bit systems, and support for 64-bit kernels with 32-bit UEFI firmware (with the latter being included only on our amd64/i386 "multi-arch" installation media). Since the previous release, members of the Debian project have also made important improvements to our supporting services. One of these is a browsable view of all source code shipped in Debian [3] currently available at sources.debian.net [4]. Of course, with over 20,000 source packages, it can be quite daunting to locate the right file. Therefore, we are also very pleased to present Debian Code Search [5], available at codesearch.debian.net [6]. Both services are complemented by a completely rewritten and more reponsive package tracking system [7]. 3: https://www.debian.org/News/weekly/2013/14/#sources 4: https://sources.debian.net 5: https://www.debian.org/News/weekly/2014/17/#DCS 6: https://codesearch.debian.net/ 7: https://tracker.debian.org/ This release includes numerous updated software packages, such as: * Apache 2.4.10 * Asterisk 11.13.1 * GIMP 2.8.14 * an updated version of the GNOME desktop environment 3.14 * GNU Compiler Collection 4.9.2 * Icedove 31.6.0 (an unbranded version of Mozilla Thunderbird) * Iceweasel 31.6.0esr (an unbranded version of Mozilla Firefox) * KDE Plasma Workspaces and KDE Applications 4.11.13 * LibreOffice 4.3.3 * Linux 3.16.7-ctk9 * MariaDB 10.0.16 and MySQL 5.5.42 * Nagios 3.5.1 * OpenJDK 7u75 * Perl 5.20.2 * PHP 5.6.7 * PostgreSQL 9.4.1 * Python 2.7.9 and 3.4.2 * Samba 4.1.17 * Tomcat 7.0.56 and 8.0.14 * Xen Hypervisor 4.4.1 * the Xfce 4.10 desktop environment * more than 43,000 other ready-to-use software packages, built from nearly 20,100 source packages. With this broad selection of packages and its traditional wide architecture support, Debian once again stays true to its goal of being the universal operating system. It is suitable for many different use cases: from desktop systems to netbooks; from development servers to cluster systems; and for database, web, or storage servers. At the same time, additional quality assurance efforts like automatic installation and upgrade tests for all packages in Debian's archive ensure that "Jessie" fulfills the high expectations that users have of a stable Debian release. A total of ten architectures are supported: 32-bit PC / Intel IA-32 (i386), 64-bit PC / Intel EM64T / x86-64 (amd64), Motorola/IBM PowerPC (powerpc for older hardware and ppc64el for the new 64-bit (little- endian)), MIPS (mips (big-endian) and mipsel (little-endian)), IBM S/390 (64-bit s390x) and for ARM, armel and armhf for old and new 32-bit hardware, plus arm64 for the new 64-bit "AArch64" architecture. Want to give it a try? ---------------------- If you simply want to try Debian 8 "Jessie" without having to install it, you can use a special image, known as a live image, available for CDs, USB sticks, and netboot setups. Initially, these images are provided for the amd64 and i386 architectures only. It is also possible to use these live images to install Debian. More information is available from the Debian Live homepage [8]. 8: http://live.debian.net/ If, instead, you want to install it to your computer's permanent storage, you can choose from a range of installation media, such as Blu- ray Discs, DVDs, CDs, and USB sticks, or from the network. Several desktop environments — GNOME, KDE Plasma Desktop and Applications, Xfce, and LXDE — may be installed through CD images; the desired one may be chosen from the boot menus of the CDs/DVDs. In addition, multi- architecture CDs and DVDs are available which support installation of multiple architectures from a single disc. Or you can always create bootable USB installation media (see the Installation Guide [9] for more details). For cloud users Debian also offers pre-built OpenStack images [10], ready to use. 9: https://www.debian.org/releases/jessie/installmanual 10: http://cdimage.debian.org/cdimage/openstack/current/ The installation images may be downloaded right now via bittorrent [11] (the recommended method), jigdo [12], or HTTP [13]; see Debian on CDs [14] for further information. "Jessie" will soon be available on physical DVD, CD-ROM, and Blu-ray Discs from numerous vendors [15] too. 11: https://www.debian.org/CD/torrent-cd/ 12: https://www.debian.org/CD/jigdo-cd/#which 13: https://www.debian.org/CD/http-ftp/ 14: https://www.debian.org/CD/ 15: https://www.debian.org/CD/vendors Upgrading Debian ---------------- Upgrades to Debian 8 from the previous release, Debian 7 (codenamed "Wheezy"), are automatically handled by the apt-get package management tool for most configurations. As always, Debian systems may be upgraded painlessly, in place, without any forced downtime, but it is strongly recommended to read the release notes [16] as well as the installation guide [17] for possible issues, and for detailed instructions on installing and upgrading. The release notes will be further improved and translated to additional languages in the weeks after the release. 16: https://www.debian.org/releases/jessie/releasenotes 17: https://www.debian.org/releases/jessie/installmanual About Debian ------------ Debian is a free operating system, developed by thousands of volunteers from all over the world who collaborate via the Internet. The Debian project's key strengths are its volunteer base, its dedication to the Debian Social Contract and Free Software, and its commitment to provide the best operating system possible. Debian 8 is another important step in that direction. Contact Information ------------------- For further information, please visit the Debian web pages at https://www.debian.org/ or send mail to <press(a)debian.org>. -- To UNSUBSCRIBE, email to debian-announce-REQUEST(a)lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmaster(a)lists.debian.org Archive: https://lists.debian.org/20150426022805.GA7860@chianamo -- Check out our blog at http://seravo.fi/blog and follow @ottokekalainen

3 5

[Maria-discuss] Proxy users in MariaDB?
by Felipe Gasper 24 Apr '15

24 Apr '15

Hello, Is it possible to emulate user roles via PROXY in MariaDB? Basically, I want to log in as “temp_w3gj6d6” but have the system treat that user as “frank”, including setting of DEFINERs and the like. I see that there is a PAM plugin in MariaDB .. has anyone used that plugin to achieve this effect? Thank you! -Felipe Gasper Houston, TX

3 9

[Maria-discuss] New Question: Executing: gpg --ignore-time-conflict
by AskMonty KB 23 Apr '15

23 Apr '15

Hello, A new question has been asked in "MariaDB Community" by zakaria. Please answer it at http://mariadb.com/kb/en/executing-gpg-ignore-time-conflict/ as the person asking the question may not be subscribed to the mailing list. -------------------------------- HI, I want to install mariadb in ubuntu server 12.04, but i get this error Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --secret-keyring .... gpg: requesting key 1BB943DB from hkp server keyserver.ubuntu.com gpg: key 1BB943DB: "MariaDB Package Signing Key <package-signing-key(a)mariadb.org>" imported gpg: no ultimately trusted keys found gpg: Total number processed: 1 gpg: imported: 1 when I use this following command : apt-key adv --recv-keys --keyserver hkp://keyserver.ubuntu.com:80 0xcbcb082a1bb943db I tried to create a file with full key : 1993 69E5 404B D5FC 7D2F E43B CBCB 082A 1BB9 43DB but i got gpg:no valid openPGP data found. kind regards -------------------------------- To view or answer this question please visit: http://mariadb.com/kb/en/executing-gpg-ignore-time-conflict/

1 0

[Maria-discuss] tx_read_only Vs transaction_read_only
by Rhys Campbell 23 Apr '15

23 Apr '15

You cannot use the tx_read_only in the .cnf file. You must specifiy transaction_read_only = 1 for it to set the value of tx_read_only on system startup. Conversely we do not seem to be able to do... SET SESSION transaction_read_only = OFF; Is this intended? Rhys Campbell Database Administrator TradingScreen, Inc. 23 York House, 5th Floor London WC2B 6UJ Email: rhys.campbell(a)tradingscreen.com<mailto:rhys.campbell@tradingscreen.com> Follow TradingScreen on Twitter<http://twitter.com/#!/TradingScreen> , Facebook<http://www.facebook.com/pages/TradingScreen/214046251945650> and our blog Trading Smarter<tradingsmarter.tradingscreen.com> This message is intended only for the recipient(s) named above and may contain confidential information. If you are not an intended recipient, you should not review, distribute or copy this message. Please notify the sender immediately by e-mail if you have received this message in error and delete it from your system.

1 0

[Maria-discuss] How many open files by daemon is still sane?
by Honza Horak 22 Apr '15

22 Apr '15

Hey, with limited experiences with mariadb deployments, I'm wondering how many open files by the mysqld daemon is still sane (expected). We have a customer that reports hundreds of thousands of open files with 600 connections (thread_pool_max_threads is used). Those processes seem rather stalled, but files in the datadir are often opened 40.000 times. Is it even possible that one file is opened several times during processing one query? Or does it mean there are ~40.000 queries running? Version of MariaDB: 5.5.40 Honza

6 14

[Maria-discuss] garb: unrecognized service
by Umarzuki Mochlis 21 Apr '15

21 Apr '15

$ sudo service garb start garb: unrecognized service After I installed galera-3, the above error appeared when I tried to start garb service. OS: Ubuntu 14.04 galera-3 v25.3.9-trusty

2 1

[Maria-discuss] New Question: Is MariaDB Client Library for Java Applications working on JAVA 6?
by AskMonty KB 21 Apr '15

21 Apr '15

Hello, A new question has been asked in "MariaDB Java Client" by jihoonko. Please answer it at http://mariadb.com/kb/en/is-mariadb-client-library-for-java-applications-wo… as the person asking the question may not be subscribed to the mailing list. -------------------------------- Hi. Requirements for Latest version of MariaDB Client for java is written java 7 or 8. Which older version of MariaDB Client Library for java is working on java 6 well? Thank you. -------------------------------- To view or answer this question please visit: http://mariadb.com/kb/en/is-mariadb-client-library-for-java-applications-wo…

1 0

[Maria-discuss] New Question: How to cleanly uninstall MariaDB
by AskMonty KB 20 Apr '15

20 Apr '15

Hello, A new question has been asked in "MariaDB Documentation" by yaroslav_nikitenko_g. Please answer it at http://mariadb.com/kb/en/how-to-cleanly-uninstall-mariadb/ as the person asking the question may not be subscribed to the mailing list. -------------------------------- I've been using MariaDB on my server. It seemed to be hacked. I couldn't restart mariadb, and I deleted it with package manager yum. However, after reinstalling that I still experienced some problems (they didn't disappear). There is an opinion http://superuser.com/a/778269/387511 that some files such as databases are not removed during MariaDB uninstall. Is it true, and what should I take care of when uninstalling MariaDB? Thank you. I've used site search but couldn't find an answer in the official documentation. I suggest adding this to the part about installation of MariaDB. -------------------------------- To view or answer this question please visit: http://mariadb.com/kb/en/how-to-cleanly-uninstall-mariadb/

3 4

[Maria-discuss] What should offer base mariadb docker image
by Honza Horak 18 Apr '15

18 Apr '15

We're having quite interesting discussion about what users expect from general mariadb docker image, so trying to reach out (future) consumers. I see few options, from simple to feature rich scenarios, so let's take three examples.. A) simple one would only include installed packages and run the mysqld server with default configuration. (That one would probably be almost unusable, since users wouldn't have easy way to initialize datadir..) B) the image would include scripts that help to initialize datadir, set basic authentication (if given) and also offers to import some dump during initialization, e.g.: #> docker run -v /mydata:/var/lib/mysql mariadb #> docker run -v /mydata:/var/lib/mysql -v /dump.sql:/expected/dir mariadb #> docker run -e ROOT_PASS=abcdefgh -v /mydata:/var/lib/mysql mariadb C) full featured image that offers simple master/slave replication just by running: #> docker run -e TYPE=master mariadb #> docker run -e TYPE=slave -e MASTER=172.16.1.12 mariadb There are some advocates of the C) but IMHO it is not doable to deliver general enough solution for master/slave (thinking about failover scenarious in the first place), right? So B) sounds much more useful and I'd prefer such docker images. Does anybody has a different opinion? (either developer/user PoV would be welcome) Honza

2 1

[Maria-discuss] verifying a table is using autogenerated PK or not
by Umarzuki Mochlis 17 Apr '15

17 Apr '15

when I deleted a few rows, those rows did not get deleted on mariadb cluster second node. $ sudo grep "wsrep_certify_nonPK" /etc/mysql/my.cnf wsrep_certify_nonPK=1 > show create table comp2012db.uni12_jevents_vevdetail; +-------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | Table | Create Table | +-------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | uni12_jevents_vevdetail | CREATE TABLE `uni12_jevents_vevdetail` ( `evdet_id` int(12) NOT NULL AUTO_INCREMENT, `rawdata` longtext NOT NULL, `dtstart` int(11) NOT NULL DEFAULT '0', `dtstartraw` varchar(30) NOT NULL DEFAULT '', `duration` int(11) NOT NULL DEFAULT '0', `durationraw` varchar(30) NOT NULL DEFAULT '', `dtend` int(11) NOT NULL DEFAULT '0', `dtendraw` varchar(30) NOT NULL DEFAULT '', `dtstamp` varchar(30) NOT NULL DEFAULT '', `class` varchar(10) NOT NULL DEFAULT '', `categories` varchar(120) NOT NULL DEFAULT '', `color` varchar(20) NOT NULL DEFAULT '', `description` longtext NOT NULL, `geolon` float NOT NULL DEFAULT '0', `geolat` float NOT NULL DEFAULT '0', `location` varchar(120) NOT NULL DEFAULT '', `priority` tinyint(3) unsigned NOT NULL DEFAULT '0', `status` varchar(20) NOT NULL DEFAULT '', `summary` longtext NOT NULL, `contact` varchar(120) NOT NULL DEFAULT '', `organizer` varchar(120) NOT NULL DEFAULT '', `url` text NOT NULL, `extra_info` varchar(240) NOT NULL DEFAULT '', `created` varchar(30) NOT NULL DEFAULT '', `sequence` int(11) NOT NULL DEFAULT '1', `state` tinyint(3) NOT NULL DEFAULT '1', `modified` datetime NOT NULL DEFAULT '0000-00-00 00:00:00', `multiday` tinyint(3) NOT NULL DEFAULT '1', `hits` int(11) NOT NULL DEFAULT '0', `noendtime` tinyint(3) NOT NULL DEFAULT '0', PRIMARY KEY (`evdet_id`) ) ENGINE=InnoDB AUTO_INCREMENT=515 DEFAULT CHARSET=utf8 | +-------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ 1 row in set (0.00 sec) It seems that there's a PK. But what would cause this?

2 1

[Maria-discuss] Table encryption 10.1.4
by Rhys Campbell 16 Apr '15

16 Apr '15

Hi All, Been playing with encryption in 10.1.4 today and there's a few issues... Firstly the manual<https://mariadb.com/kb/en/mariadb/table-encryption/> gives the following example... "Example my.cnf to enable XtraDB encryption: [mysqld] file-key-management file-key-management-filename = /mount/usb1/keys.txt innodb-encrypt-tables innodb-encrypt-logs innodb-encryption-threads=4" But doesn't make mention of the fact you need to add.. plugin-load-add=file_key_management.so for this to work. Secondly... With this config.. "plugin-load-add=file_key_management.so file_key_management file_key_management_filename = /home/rcampbel/key.enc file_key_management_filekey = FILE:/home/rcampbel/keyfile.txt file_key_management_encryption_algorithm = AES_CBC innodb-encrypt-tables innodb-encrypt-logs innodb-encryption-threads = 4" I receive the following error... ERROR Innodb: Tablespace id 0 encrypted but encryption service not available. Can't continue opening tablespace." Then if I comment out inndob-encrypt-tables we get a step further but it complains.. "unknown option -innodb-encrypt-logs" <- documentation for 10.1.4 says different<https://mariadb.com/kb/en/mariadb/table-encryption/> If I change this to... innodb-encrypt-log The server then starts up successfully. Here's a snip of some relevant variables... [cid:image001.png@01D07869.79EBCC60] After this I do seem to be able to dynamically set innodb_encrypt_tables and create an encrypted table... [cid:image002.png@01D0786A.287E0B80] Side note file_key_management_plugin.so is missing from the 10.1.3 .tar.gz bundles Rhys Campbell Database Administrator TradingScreen, Inc. 23 York House, 5th Floor London WC2B 6UJ Email: rhys.campbell(a)tradingscreen.com<mailto:rhys.campbell@tradingscreen.com> Follow TradingScreen on Twitter<http://twitter.com/#!/TradingScreen> , Facebook<http://www.facebook.com/pages/TradingScreen/214046251945650> and our blog Trading Smarter<tradingsmarter.tradingscreen.com> This message is intended only for the recipient(s) named above and may contain confidential information. If you are not an intended recipient, you should not review, distribute or copy this message. Please notify the sender immediately by e-mail if you have received this message in error and delete it from your system.

2 2

[Maria-discuss] enforce_storage_engine
by Ian Gilfillan 16 Apr '15

16 Apr '15

Hi What is the reason for the the new enforce_storage_engine option being session only? Percona's implementation is global, and I realise there was a request to make it less strict, and be overridden by session for users with the super privilege, but surely it would make sense to allow a global default to be set, rather than just session only? The notes say that it was implemented based on default_storage_engine, but that variable is global and session, not just session. ian

1 0

[Maria-discuss] Does user have SUPER privilege?
by Rasmus Johansson 15 Apr '15

15 Apr '15

Hi, I was wondering if there is a straight forward way to check whether a user has SUPER privileges or not. I came up with doing the following: --check for user’s Super_Priv on the current host SELECT Super_Priv FROM mysql.user WHERE user = 'user1' AND host = 'host1'; --and then also check for user on whatever (%) host: SELECT Super_Priv FROM mysql.user WHERE user = 'user1' AND host = '%' But is there some more convenient way of doing it, maybe using SHOW GRANTS? Rasmus -- Rasmus Johansson, VP Engineering MariaDB | t: +358 50 499 9589 | Skype: ratzpo

2 1

[Maria-discuss] MySQL for Database Administrators Ed 3.1
by Lukas Lehner 15 Apr '15

15 Apr '15

Hi I will attend "MySQL for Database Administrators Ed 3.1" from Oracle University. I will take 1Z0-883 "OCP MySQL 5.6 Database Administrator" exam. I choose Oracle University because of their high quality education (did quite a lot of courses at them). On my job I will work mainly with MariaDB and Galera Cluster. Is this exam and Oracle University course helpful for me? I have a background with classic Oracle RDBMs. cheers

2 1

[Maria-discuss] SHOW GRANTS change?
by Felipe Gasper 15 Apr '15

15 Apr '15

Hi all, I’ve noticed that MariaDB 10.0.14 shows an IDENTIFIED BY PASSWORD .. section in SHOW GRANTS, but 10.0.17 doesn’t show the password. I can’t find anything to this effect in the changelog; was this an intended change, or is it a bug? The MariaDB docs show SHOW GRANTS behaving without the password dump. Thank you! -FG

3 10

[Maria-discuss] MariaDB 10.1.4 now available
by Daniel Bartholomew 14 Apr '15

14 Apr '15

The MariaDB project is pleased to announce the immediate availability of 10.1.4. This is a Beta release. See the Release Notes and Changelog for details. - - Links - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - MariaDB 10.1.4 - Release Notes: https://mariadb.com/kb/en/mariadb-1014-release-notes - Changelog: https://mariadb.com/kb/en/mariadb-1014-changelog - Downloads: https://downloads.mariadb.org/mariadb/10.1.4 About MariaDB 10.1: - https://mariadb.com/kb/en/what-is-mariadb-101/ APT and YUM Repository Configuration Generator: - https://downloads.mariadb.org/mariadb/repositories/ - - MariaDB Webinars - - - - - - - - - - - - - - - - - - - - - - - - - There are several upcoming MariaDB-focused webinars and many previously held ones available to watch on an on-demand basis at: - https://mariadb.com/news-events/webinars - - 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://mariadb.org/jira - - 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/en/donate/ We hope you enjoy MariaDB! -- MariaDB Website - http://mariadb.org Twitter - http://twitter.com/mariadb Google+ - http://google.com/+mariadb Facebook - http://fb.com/MariaDB.dbms Knowledge Base - http://mariadb.com/kb

1 0

[Maria-discuss] New Question: Determining size of a row in bytes
by AskMonty KB 14 Apr '15

14 Apr '15

Hello, A new question has been asked in "MariaDB Community" by shortwave. Please answer it at http://mariadb.com/kb/en/determining-size-of-a-row-in-bytes/ as the person asking the question may not be subscribed to the mailing list. -------------------------------- I have a small but essential requirement that is making me seriously consider a shift away from MySQL and I am wondering if MariaDB is a viable alternative. I need to measure the size of a row in bytes (easily). Specifically, a table consists of rows belonging to several users. I need to know how much disk space is consumed by each of those users. The only solution I can find in MySQL documentation/forums are inefficient and inaccurate approximations. Does MariaDB provide some way of doing this easily? I have to do it on multiple tables which will probably change, so I don't want to build maintenance overheads in. Also obviously I don't want too much of a performance hit. -------------------------------- To view or answer this question please visit: http://mariadb.com/kb/en/determining-size-of-a-row-in-bytes/

1 0

[Maria-discuss] New Question: when you will put out the PyThon connector ?
by AskMonty KB 07 Apr '15

07 Apr '15

Hello, A new question has been asked in "Client Libraries" by gclove. Please answer it at http://mariadb.com/kb/en/when-you-will-put-out-the-python-connector/ as the person asking the question may not be subscribed to the mailing list. -------------------------------- As we know python is higt performance than PHP in Bankend . So ,will you put out PyThon 3 connector , like this ? http://dev.mysql.com/downloads/connector/python/ -------------------------------- To view or answer this question please visit: http://mariadb.com/kb/en/when-you-will-put-out-the-python-connector/

1 0

[Maria-discuss] New Question: Will MariaDB 10.1.X pick up MySQL 5.7.7 system variable changes for innodb?
by AskMonty KB 06 Apr '15

06 Apr '15

Hello, A new question has been asked in "What is in the Different MariaDB Releases?" by vanessaharo. Please answer it at http://mariadb.com/kb/en/will-mariadb-101x-pick-up-mysql-577-system-variabl… as the person asking the question may not be subscribed to the mailing list. -------------------------------- Will MariaDB 10.1.X pick up MySQL 5.7.7 system variable changes for innodb? http://dev.mysql.com/doc/refman/5.7/en/innodb-parameters.html#sysvar_innodb… • innodb_large_prefix is enabled by default in MySQL 5.7.7. This change coincides with the default value change for innodb_file_format, which is set to Barracuda by default in MySQL 5.7.7. Together, these default value changes allow larger column prefix indexes to be created when using ROW_FORMAT=DYNAMIC or ROW_FORMAT=COMPRESSED. If either option is set to a non-default value, column prefixes are silently truncated to 768 bytes. innodb_large_prefix is deprecated in MySQL 5.7.7, and will be removed in a future release. innodb_large_prefix was introduced in MySQL 5.5 to allow users to create tables compatible with the InnoDB Plugin in MySQL 5.1, which has reached the end of its product lifecycle. -------------------------------- To view or answer this question please visit: http://mariadb.com/kb/en/will-mariadb-101x-pick-up-mysql-577-system-variabl…

1 0

[Maria-discuss] MariaDB 10: repair table leaves 'TMM' files
by Reindl Harald 06 Apr '15

06 Apr '15

if somebody has day for day the ame table damaged just go to the datadir and delete the leave .TMM file and after that it should not happen again for at least some time cms1_user_online.TMM

1 0