
QED is a fast, small, pure Java, relational database, implementing the SQL 92 standard, with transactions and resilient failure recovery. Go To Mckoi SQL Database Quadcap Embeddable Database QED, the Quadcap Embeddable Database. It is highly multi-threaded and features an extendable object-oriented engine.

Go To Hypersonic SQL Mckoi SQL Database Mckoi SQL Database is optimized to run as a client/server database server for multiple clients, however it can also be embedded in an application as a stand-alone database. Additionally, it includes tools such as a minimal web server, in-memory query and management tools (can be run as applets) and a number of demonstration examples. It offers a small (less than 160k), fast database engine which offers both in memory and disk based tables.

Open Source Database Engines in Java Hypersonic SQL hsqldb is a relational database engine written in Java, with a JDBC driver, supporting a rich subset of ANSI-92 SQL (BNF tree format).
