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Re: Problems with system locking
Posted by: Ingo Strüwing
Date: July 31, 2006 04:16AM

Here is a reply I got from a developer:

The query cache never runs global garbage collection without a command. Maybe somebody issued it (FLUSH/RESET QUERY CACHE)?

Another way to get a lot of reorganization work in the
cache: a big/huge number of small requests which are thrown out by:
1) update of table which they use.
2) query cache trying to find space for a big result (can be prevented by setting
query_cache_limit to some reasonable value)

Also you can play with query_cache_min_res_unit variable, it can help
in case of high memory fragmentation.

Regards,
Ingo

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