How not to use memcached
(Don't) read data from memcache to write back to a database. (Don't) forget the negative caching case. (Don't) set the cache timeouts too low. (Don't) forget to lock. (Don't) store low read/write ratio data. (Don't) cache data too early. (Don't) store large things (Don't) store images (Don't) rely on memcache as a persistence layer.
via hachi.kuiki.net
Slides from How not to use memcached, presented at OSCON by Jonathan Steinert from SixApart.
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