Design pattern for memcached data caching?

If you're using a cache then, to get the most out of it, you have to accept that your data will always be stale to an extent, and that some portions of the data will be out of sync with each other. Trying to keep all the records up to date by maintaining a single copy is something best left to relational databases, so if this is the behaviour you need then you're probably better off with a powerful 64-bit DB server with a lot of RAM so it can perform its own internal caching.

Read about the Identity Map pattern. This is a way to make sure you only keep one copy of a given row in your application space. Whether you store it in memcached or just plain objects, this is a way to handle what you want.

I would guess that Identity Map is best used when you typically fetch one row at a time.

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