Am 15.07.2013 16:00, schrieb Hartmut Holzgraefe: > On 15.07.2013 15:31, Egoitz Aurrekoetxea wrote: >> Could Mysql cache cause a performance penalty, when invalidating >> queries of a big Mysql cache zone? > > can, and *will* ... see also http://dom.as/tech/query-cache-tuner/
Optimal size for your query cache: 0 thats ridiculous > cache is locked while entries are being purged to prevent handing out > cached results that may already be out-of-date, and the more active > cache entries that need to be purged the longer it stays locked ... but in most cases the benefit outbeats this overhead massive since you have more read than write [OK] Query cache efficiency: 93.6% (40M cached / 42M selects) nobody can tell me that all these 40M queries would have been faster without cache by reduce the overhead
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