once bitten

words and things from Edd Dumbill 
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memcache

 

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.
  • Slides from How not to use memcached, presented at OSCON by Jonathan Steinert from SixApart.

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