H2 is a relational database management system written in Java. It can be embedded in Java applications or run in the client-server mode. The disk footprint (size of the jar file) is about 1 MB.

The software is available as open source software under modified versions of the Mozilla Public License or the original Eclipse Public License. The modification of the MPL is a shorter file header and the license name.

Read more about H2 (DBMS):  Main Features, Utilities, History

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H2 (DBMS) - History
... The development of the H2database engine started in May 2004, but it was first published in December 2005 ... The name H2stands for Hypersonic 2, however H2does not share code with Hypersonic SQL or HSQLDB ... H2is built from scratch ...