WebSphere Event Broker uses databases to store internal data about the broker. You must create and configure the broker database before you can create any brokers.
A broker stores configuration and control information in its database. You must create the broker database before you can create the broker because when the broker is created, the broker's tables are automatically created in the specified broker database. You can create a database for each broker, or you can use one database for multiple brokers if the platforms are compatible.
If you create a broker on Linux or UNIX, depending on your operating system, you can create the broker database in DB2, Oracle, or Sybase. On Windows, you can create the broker database in DB2, Oracle, Sybase, SQL Server, or Derby. See Supported databases to check which databases are supported on your operating system.
If you create a 64-bit execution group in the broker, the broker database must be a 64-bit database instance.
There is no fixed size requirement for the broker database; the size required depends on the complexity of your message flows. If you develop message flows that support many publishers or subscribers, you might need to increase your initial sizings.
When you have created a broker database, you must enable a connection from the broker to the database. On all platforms except Linux (zSeries platform) and Linux (POWER platform) the broker connects to databases using ODBC. For 32-bit brokers (all platforms except HP-UX (Integrity platform)), you must always enable a 32-bit ODBC connection. For 64-bit brokers (HP-UX (Integrity platform) only), you must always enable a 64-bit ODBC connection.
For more information about enabling 32-bit and 64-bit connections to the broker database see Broker database connections
On Windows or Linux (x86 platform), if you use the Default Configuration wizard to create the Default Configuration, the wizard automatically creates a broker database for the broker. On Linux, the wizard creates the broker database using DB2; on Windows, if DB2 is not installed, the wizard uses the Derby database manager by default, although you can choose to use DB2 if it is installed.
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