Features Summary

JAVA

• 100% Java
• Support JDK 1.1.x, 1.2.x, 1.3.x, 1.4.x, 1.5.x, 1.6.x
• Extensive JDBC interface support with batch statement and scrollable ResultSet functionality
• Full JDBC DatabaseMetaData and ResultSetMetaData support
• Java stored procedures and functions
• Full support for PreparedStatement objects to speed up query processing

SQL

• Relational Database Management System, with the object capabilities of Java
• Very extensive support for SQL:2003 Standard syntax, including most optional features
• Supports all base data types of the SQL Standard, including BINARY, BIT, BOOLEAN, date-time, INTERVAL, BLOB, CLOB
• Supports user-defined DOMAIN types, including type constraints
• Fast SELECT, INSERT, DELETE, UPDATE and MERGE operations
• INNER, LEFT OUTER, RIGHT OUTER and FULL joins
• UNION, EXCEPT, INTERSECT, including use of parentheses, limits and offsets
• Scalar (single value) SELECTS, row and correlated subqueries including IN, EXISTS, ANY, ALL
• Views, Temp tables and sequences
• Primary key, unique and check constraints on single or multiple columns 
• Referential Integrity (foreign keys) on multiple columns with full cascading options (delete, update, set null, set default)
• ORDER BY, GROUP BY and HAVING
• COUNT, SUM, MIN, MAX, AVG and statistical aggregate functions
• Full support for SQL expressions such as CASE .. WHEN .. ELSE .. , NULLIF etc.
• SQL standard autoincrement column support plus sequences
• Transaction COMMIT, ROLLBACK and SAVEPOINT support
• Multiple schemata per database
• Triggers, implemented as Java classes, or as SQL statements
• Database security with passwords, user rights and roles with GRANT and REVOKE
• Extensive set of ALTER TABLE commands, including change of table column type

Persistence

• In-memory tables for fastest operation
• Disk based tables for large data sets
• Text tables with external file data sources such as CSV files
• Disk tables (CACHED TABLE) up to 8GB and text tables up to 2GB each
• Size of each string or binary item only limited by memory
• Database dump as SQL script with or without data

Deployment

• Embedded (into Java applications) and Client-Server operating modes
• Three client server protocols: HSQL, HTTP and HSQL-BER - can run as an HTTP web server - all with SSL option
• Can be used in applets, read-only media (CD), inside jars, webstart and embedded applications
• Multiple databases per JVM

Utilities

• Powerful and compact java command line and GUI tools for database management
• Tranfer tool for conversion of databases to / from other popular database managment systems