MySQL thread status: Waiting for query cache lock. Waiting for query cache lock is a connection status specific to MySQL 5.5 or newer...
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Sysadmin tips
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Tips and Tricks that we have to know and abuse every day. sysadmin, sysops and network.
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stephane gault
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Beware of this new feature in MySQL 5.5 or newer. We've learn the hard way, that it can be a killer on your performance at some point in a high concurrent query environnement. When you start to see some logs with : "Waiting for query cache lock", it may be time for disable it totaly !