Introducing mcrouter: A memcached protocol router for scaling memcached deployments | Engineering Blog | Facebook Code
Building and Scaling a Startup on Rails: 12 Things We Learned the Hard Way - Axon Flux - A Ruby on Rails Blog
If you memcache first, you will never feel the pain and never learn how bad your database indexes and Rails queries are.
Memcachedb is a distributed key-value storage system designed for persistent. It is not a cache solution, but a persistent storage for high-frequency writing and reading. It conforms to memcache protocol(not completed, see below), so any memcached client can have connectivity with it. Memcachedb uses Berkeley DB as a storing backend, so lots of features including transaction and replication are supported.
APC vs Memcached
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