H2

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About H2

H2 is one of the leading open-source relational database management systems written in Java. It can be embedded in Java applications as well as run in the client-server mode. The main programming APIs of H2 are SQL and JDBC, however the database also supports the usage of the PostgreSQL ODBC driver by acting like a PostgreSQL server. The database engine delivers features like a browser based console application or  a small footprint around 1.5 MB jar file size.