FyDB is a distributed in-memory no-SQL DB. It supports distributed deployment, and can integrate heterogeneous data sources. Data of FyDB is stroed in memory as key-value structure, and it is also persistent.
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Small, simple and robust database in Java. If you need a persistent hash map, this is for you. It is basically as fast as it gets without caching, but doesn't offer any non-basic features like transactions or concurrent access.