Comments on: query cache tuning

By: Domas Mituzas

Domas Mituzas — Thu, 21 Apr 2011 23:57:46 +0000

I ignore 5.5! ;-)

By: James Day

James Day — Thu, 21 Apr 2011 23:56:03 +0000

This is a bug report for your online query cache tuner.

It doesn’t also say to set query_cache_type = 0 if your MySQL version is 5.5 or higher, to eliminate taking the qc mutex.

Bet you never thought you’d get a bug report on that. :)

By: Mohammad Lahlouh

Mohammad Lahlouh — Thu, 09 Jul 2009 13:52:28 +0000

I agree

http://bugs.mysql.com/bug.php?id=45544

By: Julian

Julian — Thu, 09 Jul 2009 08:31:41 +0000

So 0 is the best tuning you can have. Sure.

By: Willko

Willko — Thu, 09 Jul 2009 08:13:44 +0000

agree…

By: Domas Mituzas

Domas Mituzas — Thu, 09 Jul 2009 06:34:25 +0000

Because, short term hacks shouldn’t win over proper data structuring, indexing and queries :)

By: Mark Callaghan

Mark Callaghan — Thu, 09 Jul 2009 04:41:50 +0000

How does one tune away the mutex contention? It does not scale on multi-core servers.

By: erkules

erkules — Wed, 08 Jul 2009 23:37:25 +0000

domas you rock!
rock on!

By: Sandy

Sandy — Wed, 08 Jul 2009 22:14:04 +0000

I cant get to the URL or the guide you have told can you repost the correct URL. It can be of great help !!

Thanks

By: Giuseppe Maxia

Giuseppe Maxia — Wed, 08 Jul 2009 21:58:16 +0000

I like it, and I advertised it.

RT @mysql_community: Extremely funny, possibly helpful, and certainly assertive advice on query cache tuning. http://bit.ly/jwulW—
Giuseppe Maxia (@datacharmer) July 08, 2009

But I liked your optimization operator more.

Cheers

Giuseppe