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Re: Spider and query cache
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?
(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
(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 <colin@xxxxxxxxxxx>:
> On 29 May 2014, at 10:23, Roberto Spadim <roberto@xxxxxxxxxxxxx> 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:
> Default is 0, that is no query cache when a select is issued on a remote
> =1 passes sql_cache - result can be cached
> =2 sql_no_cache is passed - query result not cached
> that's all documented:
> 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
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