When do we really need a key/value database instead of a key/value cache server?

Posted by Runner on Stack Overflow See other posts from Stack Overflow or by Runner
Published on 2010-04-09T16:15:07Z Indexed on 2010/04/18 0:53 UTC
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key-value-store

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cache

Most of the time,we just get the result from database,and then save it in cache server,with an expiration time.

When do we need to persistent that key/value pair,what's the significant benifit to do so?

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