Comments on: The fading of Query Cache limitations http://www.mysqldiary.com/the-fading-of-query-cache-limitation/ Exploring, Sharing and Discussing MySQL practice Thu, 02 Feb 2012 09:16:49 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: emt traininghttp://www.mysqldiary.com/the-fading-of-query-cache-limitation/comment-page-1/#comment-1434 emt training Thu, 15 Jul 2010 10:33:40 +0000 http://www.mysqldiary.com/?p=50#comment-1434 nice post. thanks. nice post. thanks.

]]> By: Robinhttp://www.mysqldiary.com/the-fading-of-query-cache-limitation/comment-page-1/#comment-1279 Robin Mon, 28 Jun 2010 05:08:10 +0000 http://www.mysqldiary.com/?p=50#comment-1279 Hello,Ask a question. How to expand mysql query cache? Only add physical memory? memcached can not cache SQL results. Hello,Ask a question.
How to expand mysql query cache?
Only add physical memory? memcached can not cache SQL results.

]]> By: MarkSpizerhttp://www.mysqldiary.com/the-fading-of-query-cache-limitation/comment-page-1/#comment-612 MarkSpizer Mon, 03 May 2010 11:02:51 +0000 http://www.mysqldiary.com/?p=50#comment-612 great post as usual! great post as usual!

]]> By: Shlomi Noachhttp://www.mysqldiary.com/the-fading-of-query-cache-limitation/comment-page-1/#comment-20 Shlomi Noach Wed, 16 Dec 2009 14:02:02 +0000 http://www.mysqldiary.com/?p=50#comment-20 Hi, Perhaps the most obvious limitation to query cache is its global mutex, effectively serializing access to the cache. A lot has been written on this. There are many performance issues with using the cache. Try <a href="http://www.mysqlperformanceblog.com/2009/03/19/mysql-random-freezes-could-be-the-query-cache/#comment-516145" rel="nofollow">http://www.mysqlperformanceblog.com/2009/03/19/mysql-random-freezes-could-be-the-query-cache/#comment-516145</a>. The next big limitation, as I see it, is the naive invalidation mechanism, which blindly removes queries from the cache, that could have been kept there, due to global per-table invalidation. Regards Hi,

Perhaps the most obvious limitation to query cache is its global mutex, effectively serializing access to the cache.
A lot has been written on this.

There are many performance issues with using the cache. Try http://www.mysqlperformanceblog.com/2009/03/19/mysql-random-freezes-could-be-the-query-cache/#comment-516145.

The next big limitation, as I see it, is the naive invalidation mechanism, which blindly removes queries from the cache, that could have been kept there, due to global per-table invalidation.

Regards

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