HSQLDB is a relational database engine written 100% in Java , with a JDBC driver. This supports a subset of ANSI-92 SQL. It is best known for its small size, ability to execute completely in memory and its speed. It offers a small (about 100k), fast database engine which offers both in memory and disk based tables. Embedded and server modes are available. Additionally, it includes tools such as a minimal web server, in-memory query and management tools (can be run as applets or servlets, too) and a number of demonstration examples.This is currently being used as a database and persistence engine in many Open Source Software projects and even in commercial projects and products! It is free under the Modified BSD License.

HSQLDB home : here
Features of hsqldb : here
Known problems with hsqldb: here

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