I have done a lot of recent work on local key value stores, mostly for a java electrum server I am working on.

I'd suggest considering LMDB. One downside is that it is memory mapped so 32-bit systems that need over 2gb of storage are right out. Other than that, it is quite fast and seems reliable in my testing.

On Thu, Oct 22, 2015 at 2:37 PM Jeff Garzik via bitcoin-dev <bitcoin-dev@lists.linuxfoundation.org> wrote:

Here is the beginnings of an implementation to replace leveldb with sqlite: https://github.com/jgarzik/bitcoin/tree/2015_sqlite

It builds, but still needs work before passing tests.

It was noted that leveldb is unmaintained, and this is part of researching alternatives that are maintained and reliable.

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