ok kentoku the idea is, if the client (the mysql user) use SQL_CACHE, send it to spider external servers, if SQL_NO_CACHE is used, send it to spider external servers, if SQL_CACHE and SQL_NO_CACHE aren't used, use 'query_cache_type' variable ( https://mariadb.com/kb/en/server-system-variables/#query_cache_type )
here i develop system considering a good query cache use, and i try to not depend at memcache to have a good performace (but sometimes it's very usefull), i'm testing spider engine yet, my first use is partitioning, and now i'm testing external servers as shard option, just to study, not a production use yet if you have time to create it :) no problem, could you report after a patch? i like to read mariadb internal code to understand how to use it better thanks kentoku =), tell me if i can help you 2014-06-03 16:30 GMT-03:00 kentoku <kentokush...@gmail.com>: > Hi Roberto, > >> nice Colin, I read manual and got this doubt, about the query_cache option >> >> all queries have sql_cache, or just queries that should be cached? >> for example... >> >> (1)mysql user -> (2)mysql database with spider -> (3)external database >> considering at (1 session) and (2 global), spider query_cache = 1 (sql_cache >> option is passed.) >> >> if (1) send: SELECT SQL_NO_CACHE * FROM spider_table (should not be >> cached) >> (2) will send to (3): SELECT SQL_CACHE * FROM external_spider_table >> (the wrong option) >> or : SELECT SQL_NO_CACHE * FROM spider_table ? (the right option) > > Spider's query_cache option is option for each Spider table. It works > adding SQL_CACHE and SQL_NO_CACHE statically, and it does not use > SQL_CACHE and SQL_NO_CACHE option from user query. > >> maybe a "3" should be created? use SQL_CACHE option from user query? > > I think it is better for creating another option for using SQL_CACHE > option from user query rather than creating "3", because these options > can be combined. > I'll try to create it, if you need it! > > Thanks, > Kentoku > > > 2014-05-30 23:24 GMT+09:00 Roberto Spadim <robe...@spadim.com.br>: >> nice Colin, I read manual and got this doubt, about the query_cache option >> >> all queries have sql_cache, or just queries that should be cached? >> for example... >> >> (1)mysql user -> (2)mysql database with spider -> (3)external database >> considering at (1 session) and (2 global), spider query_cache = 1 (sql_cache >> option is passed.) >> >> if (1) send: SELECT SQL_NO_CACHE * FROM spider_table (should not be >> cached) >> (2) will send to (3): SELECT SQL_CACHE * FROM external_spider_table >> (the wrong option) >> or : SELECT SQL_NO_CACHE * FROM spider_table ? (the right option) >> >> >> maybe a "3" should be created? use SQL_CACHE option from user query? >> >> >> >> >> 2014-05-30 8:25 GMT-03:00 Colin Charles <co...@mariadb.org>: >> >>> >>> On 29 May 2014, at 10:23, Roberto Spadim <robe...@spadim.com.br> wrote: >>> >>> > 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? >>> > >>> >>> spider has a table parameter called query_cache that sends query from >>> spider to remote server - see: >>> https://mariadb.com/kb/en/spider-table-system-variables/#query_cache >>> Default is 0, that is no query cache when a select is issued on a remote >>> server >>> =1 passes sql_cache - result can be cached >>> =2 sql_no_cache is passed - query result not cached >>> that's all documented: >>> http://dev.mysql.com/doc/refman/5.5/en/query-cache-in-select.html >>> >>> I notice that in this article, https://mariadb.com/kb/en/query-cache/, the >>> limitations do state: " • The query cache is not used by the Spider >>> storage engine (amongst others)." >>> >>> And then we have this article, >>> https://mariadb.com/kb/en/spider-feature-matrix/ that also states spider >>> supports the query cache - "Query Cache tuning per table of the on remote >>> backend" - Yes >>> >>> So, docs need to be clearer/in sync, since spider can't use the query >>> cache on a spider node, but it can on a remote server >>> -- >>> Colin Charles, Chief Evangelist, SkySQL - The MariaDB Company >>> blog: http://bytebot.net/blog/| t: +6-012-204-3201 | Skype: colincharles >>> >> >> >> >> -- >> Roberto Spadim >> SPAEmpresarial >> Eng. Automação e Controle >> >> _______________________________________________ >> Mailing list: https://launchpad.net/~maria-discuss >> Post to : maria-discuss@lists.launchpad.net >> Unsubscribe : https://launchpad.net/~maria-discuss >> More help : https://help.launchpad.net/ListHelp >> -- Roberto Spadim SPAEmpresarial Eng. Automação e Controle _______________________________________________ Mailing list: https://launchpad.net/~maria-discuss Post to : maria-discuss@lists.launchpad.net Unsubscribe : https://launchpad.net/~maria-discuss More help : https://help.launchpad.net/ListHelp
