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Versions of the HSQLDB jar that are compiled with JDK 6 or JDK 5 are also available.Those versions are numbered 2.3.6 to distinguish the capability differences.Utilities such as Sql Tool and Database Manager are covered in a separate Utilities Guide.The Hyper SQL RDBMS and JDBC Driver provide the core functionality.This guide covers the database engine features, SQL syntax and different modes of operation.The Server, JDBC interfaces, pooling and XA components are documented in the Java Doc.
The latest, updated version can be found at If you notice any mistakes in this document, or if you have problems with the procedures themselves, please use the HSQLDB support facilities which are listed at This document is available in several formats.
These modes allow a high degree of compatibility with several other database systems which use non-standard SQL syntax.
Hyper SQL is written in the Java programming language and runs in a Java virtual machine (JVM).
Copyright 2002-2018 Blaine Simpson, Fred Toussi and The HSQL Development Group.
Permission is granted to distribute this document without any alteration under the terms of the HSQLDB license.
Hyper SQL supports three live switchable transaction control models, including fully multi threaded MVCC, and is suitable for high performance transaction processing applications.