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hsqldb
HSQLDB (''Hyper SQL Database'') is a relational database management system written in Java. It has a JDBC driver and supports a large subset of SQL-92 and SQL:2008 standards.〔(【引用サイトリンク】 publisher=hsqldb.org )〕 It offers a fast,〔(【引用サイトリンク】 publisher=polepos.org )〕 small (around 1300 kilobytes in version 2.2) database engine which offers both in-memory and disk-based tables. Both embedded and server modes are available for purchase.
Additionally, it includes tools such as a minimal Web server, command line and GUI management tools (can be run as applets), and a number of demonstration examples. It can run on Java runtimes from version 1.1 upwards, including free Java implementations such as Kaffe.
HSQLDB is available under a BSD license. It is used as a database and persistence engine in many open source software projects, such as OpenOffice Base, LibreOffice Base, the Standalone Roller Demo,〔(【引用サイトリンク】 publisher=rollerweblogger.org )〕 and the Jitsi VoIP and video-conference client since version 2.6. It is also used in commercial products, such as Mathematica and InstallAnywhere (starting with version 8.0).〔(【引用サイトリンク】publisher=hsqldb.org )〕
== Transaction support ==
HSQLDB version 2.0 has three transaction control modes. It supports with table level locks or with multiversion concurrency control (MVCC), or a combination of locks and MVCC. version 1.8.1 supports transaction isolation level 0 (read uncommitted) only.〔(【引用サイトリンク】 url = http://hsqldb.org/doc/2.0/guide/sessions-chapt.html#sqlgeneral_trans_cc-sect )〕
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