May 2014 - discuss - lists.mariadb.org

[Maria-discuss] Spider and query cache
by Roberto Spadim 23 Sep '14

23 Sep '14

Hi guys! I'm with a doubt, spider engine don't allow query cache right? But does it use sql_cache sql_no_cache when possible? -- Roberto Spadim SPAEmpresarial Eng. Automação e Controle

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[Maria-discuss] EXPLAIN and CONNECT
by Federico Razzoli 04 Jun '14

04 Jun '14

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[Maria-discuss] Does the Cassandra storage engine support CQL3 created tables?
by Mohammed Guller 03 Jun '14

03 Jun '14

I am able to access a Cassandra column family created with COMPACT storage directive from MariaDB (v10.0.10). However, it does not seem to recognize regular CFs created using CQL3. I am not sure whether I am missing some configuration step in the Cassandra storage engine or it still does not support regular CQL3 CFs. Has anyone able to make Cassandra SE work with regular CQL3 CFs? Mohammed Applications Architect, Glassbeam Inc, www.glassbeam.com<http://www.glassbeam.com/>, 5201 Great America Parkway, Suite 360, Santa Clara, CA 95054 p: +1.408.740.4610<tel:%2B1.408.740.4615>, m: +1.925.786.7521<tel:%2B1.650.804.5065>, f: +1.408.740.4601<tel:%2B1.408.740.4601>

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[Maria-discuss] query cache and galera
by Roberto Spadim 02 Jun '14

02 Jun '14

Hi guys, i was testing mariadb-galera and checked that query cache is disabled with galera Is it ok or i'm doing something wrong? -- Roberto Spadim SPAEmpresarial Eng. Automação e Controle

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[Maria-discuss] Are queries queued when locking a table?
by Jimmy Thrasibule 28 May '14

28 May '14

Hello, Some backup tools make use of table locking to ensure data consistency during the operation. I'm wondering about what happens to the incoming queries for the table being locked. Obviously, the request will be pending until the table is unlocked but this way some timeout value may be reached. Another option could be to accept and queue all requests and replay them once the table is unlocked. So can you tell me how MariaDB is handling such situation. Is the second option (asynchronous request), can be activated within MariaDB? Best, Jimmy

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[Maria-discuss] kill query id
by Roberto Spadim 26 May '14

26 May '14

Hi guys, some time ago i reported a MDEV-4911 about kill a query by query_id I'm was a bit busy and i don't know if that mdev was merged to official release, does anyone know about it? -- Roberto Spadim SPAEmpresarial Eng. Automação e Controle

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[Maria-discuss] Role template
by Jimmy Thrasibule 26 May '14

26 May '14

Hi, Roles [1] have been introduced with MariaDB 10.0.5. This feature is very interesting to group and standardize grants in one place. However roles are static, meaning that it is not possible to create a template to apply later on another database. I'm looking for something similar to a stored procedure: CREATE ROLE r1(db); GRANT ALL PRIVILEGES ON $(db).* TO r1; Here, the role takes a parameter we can use to make privileges a bit more dynamic. We can then apply this role on a dedicated database like: GRANT r1(mydb) TO 'myuser'@'localhost'; Can this already be done or do you think that's a feature that could come? [1]: https://mariadb.com/kb/en/roles-overview/ Regards, Jimmy

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Re: [Maria-discuss] SPIDER Maria10 ->My55
by Federico Razzoli 25 May '14

25 May '14

Hi Kentoku I think you answered directly to my address by mistake, so I'm sending this reply to the list. I changed the values of those variables and now everything works. Thank you! Regards Federico -------------------------------------------- El dom, 25/5/14, kentoku <kentokushiba(a)gmail.com> escribió: Asunto: Re: [Maria-discuss] SPIDER Maria10 ->My55 Para: "Federico Razzoli" <federico_raz(a)yahoo.it> Fecha: domingo, 25 de mayo, 2014 20:02 Hi Federico, > Can a SPIDER table, on MariaDB 10.0, connect to a remote MySQL 5.5 table? I can't find this info. Yes, it can. > If it can, I have a problem I don't understand. I can create the table, but when I execute any query I get: > > ERROR 1227 (42000): Access denied; you need (at least one of) the SUPER privilege(s) for this operation > > (which is misleading in any case, since I have SUPER) > > Nothing is written to the local error log (and I can't access the remote one). Normally, Spider sends "set sql_log_off" command to remote server after connecting, and this command needs SUPER privilege. For fixing this error, please perform one of the followings. - add SUPER privilege to user for Spider table on remote MySQL 5.5 server. - set Spider options "spider_internal_sql_log_off = 0" and "spider_remote_sql_log_off = 0" in configuration file. Thanks, Kentoku 2014-05-23 18:38 GMT+09:00 Federico Razzoli <federico_raz(a)yahoo.it>: > Hi all. > Can a SPIDER table, on MariaDB 10.0, connect to a remote MySQL 5.5 table? I can't find this info. > If it can, I have a problem I don't understand. I can create the table, but when I execute any query I get: > > ERROR 1227 (42000): Access denied; you need (at least one of) the SUPER privilege(s) for this operation > > (which is misleading in any case, since I have SUPER) > > Nothing is written to the local error log (and I can't access the remote one). > > Federico > > _______________________________________________ > 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] query result inconsistency between MariaDB 10.0.x and Oracle MySQL 5.1.x
by Charles Cazabon 23 May '14

23 May '14

Greetings, I recently upgraded the db server behind an application from MySQL 5.1.73 (as shipped in Ubuntu 10.04 "Lucid") to MariaDB 10.0.11 (from the MariaDB repo). A colleague of mine found an inconsistency between the results produced by the two servers for a given query. What we don't know is, is this a bug (I gather Maria is aiming at 100% compatibility), or is this somehow due to the query relying on unspecified behaviour (that the two db servers are therefore free to optimize differently)? The query is: SELECT t1.id, t2.album_id FROM t1 LEFT OUTER JOIN t2 ON t1.data_id = t2.id AND t1.event_type IN (1002, 1001, 1000) WHERE t1.event_type IN (1000, 1001, 1002, 1200, 1201, 1202, 1203) GROUP BY t1.id ORDER BY t1.id DESC LIMIT 0, 20; The MariaDB result looks like this: +-----+----------+ | id | album_id | +-----+----------+ | 623 | NULL | | 622 | NULL | | 621 | NULL | | 620 | NULL | | 619 | NULL | | 618 | NULL | | 617 | NULL | | 616 | NULL | | 615 | NULL | | 614 | NULL | | 613 | NULL | | 612 | 194 | | 611 | NULL | | 610 | NULL | | 609 | NULL | | 608 | 193 | | 607 | NULL | | 606 | NULL | | 605 | NULL | | 604 | NULL | +-----+----------+ And the Oracle MySQL result looks like this: +-----+----------+ | id | album_id | +-----+----------+ | 623 | NULL | | 622 | NULL | | 621 | NULL | | 620 | NULL | | 619 | NULL | | 618 | NULL | | 617 | NULL | | 616 | 196 |<-- different | 615 | NULL | | 614 | NULL | | 613 | NULL | | 612 | 194 | | 611 | 194 |<-- different | 610 | NULL | | 609 | NULL | | 608 | 193 | | 607 | 193 |<-- different | 606 | NULL | | 605 | NULL | | 604 | NULL | +-----+----------+ My colleague pointed out that if you EXPLAIN the queries, you can see that the two databases are interpreting the query differently -- see the "Extra" column. I can't paste the explain output here without using very long lines, so I've pastebinned it: http://pastebin.com/n2sbH0kY My colleague has made the data from these tables available here: https://dl.dropboxusercontent.com/u/7755033/fatdrop/test_case_data.sql We've found workarounds for this, but we're really wondering if we've found a problem (either in MariaDB-MySQL consistency, or in the query, or ... ?). Any assistance appreciated. Charles -- ------------------------------------------------------------------ Charles Cazabon <charlesc-web-register-launchpad.net(a)pyropus.ca> Software, consulting, and services available at http://pyropus.ca/ ------------------------------------------------------------------

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[Maria-discuss] Rollback from 10 to 5.5 with WHM
by Dan 23 May '14

23 May '14

Hi, I installed MariadB 10 but was seeing poor performance and query times, so I rolled back to Mysql and saw better results. I wanted to rollback to Mariadb 5.5 but when going through the steps at http://blog.cpanel.net/mysql-mariadb/ and having the 5.5 repo in my Yum repos lists, it still tries to install MariaDB 10. Does anyone know why or how I can install 5.5 on WHM after installing and removing 10? Cheers Dan

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