Supported Databases

The supported databases depends on you Java application server. Using the Red Hat JBoss Application server we suggest some of the following databases:

Oracle 11g, 11g RAC
DB2 9.7 or above
Microsoft SQL Server 2008
Sybase ASE 15.5 (jConnect 6.0)
MySQL 5.1, 5.5
PostgreSQL 8.4, 9.1

The following databases can be suggested as “compatible”:

Apache Derby
HP NonStop SQL/MX 2.0 (mit HP Dialect)
Firebird (1.5 mit JayBird 1.01)
FrontBase
Informix
Ingres
Interbase (6.0.1)
Mckoi SQL
NuoDB 1.2, 2.0
Pointbase Embedded (4.3)
Progress 9
Sybase ASE 15.7 (jConnect 7.0)

Source:
https://developer.jboss.org/wiki/SupportedDatabases2