FastDB is an open-source, in-memory database that's tightly integrated with C++ (it supports a SQL-like query language where tables are classes and rows are objects). Like most IMDBs, it's meant for applications dominated by read access patterns. The algorithms and data structures are optimized for systems that read and write data entirely in main memory (RAM). It's supposed to be very fast, even compared to other in-memory databases, but I can't find any benchmarks online. is an open-source, in-memory database th