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似乎与memcachedb 相似的产品，应该看看源代码。

nmdb is a network database (dbm-style) for controlled networks that can use different protocols to to communicate with its clients. It supports TIPC, TCP, UDP and SCTP.
It consists of an in-memory cache that saves (key, value) pairs, and a persistent backend that stores the pairs on disk.
Both work combined, but the use of the backend is optional, so you can use the server only for cache queries, pretty much like memcached.

A library is provided to interact with the database and the cache in a very simple way. Python, D, NewLISP, Ruby, Bigloo Scheme, and Haskell bindings are also available and come with the distribution (although except for the Python bindings, the rest are not widely tested).

It's written in C, in about 5000 lines of code, and depends on libevent (network polling) and can use qdbm or berkeley db as database backends.

The license for the server is Open Software License 3.0, and the library is BOLA (Public Domain), so it's completely open source, you can run the software anywhere, and link the library with whatever you want.

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