Query Cache on FromDual GmbH

MySQL Query Cache does not work with Complex Queries in Transactions

oli.sennhauser@fromdual.com (Oli Sennhauser) — Wed, 29 Jun 2011 13:28:27 +0000

We did recently a review of one of our customers systems and we found that the Query Cache was disabled even thought it had significant more read than write queries.
When we asked the customer why he has not enabled the Query Cache he mentioned a review that was done a few years ago and which stated that the Query Cache hit ratio was non optimal.
This was verified on a testing system which had the Query Cache enabled by accident.

Regularly flushing the MySQL Query Cache

oli.sennhauser@fromdual.com (Oli Sennhauser) — Fri, 17 Jun 2011 21:26:00 +0000

When we analyze our customers systems we see typically a high fragmentation of the query cache after a while. This leads to a less optimal use of the Query Cache than possible.

Typical automated MySQL maintenance jobs, query cache

oli.sennhauser@fromdual.com (Oli Sennhauser) — Mon, 25 Aug 2008 20:06:00 +0000

The following maintenance jobs are typically run against a MySQL database: