Configuring a messaging engine data store to use a data source

After configuring a JDBC data source, you can configure a messaging engine data store to use the data source.

1. In the navigation pane, click Service integration -> Buses -> bus_name -> [Topology] Messaging engines -> engine_name.
2. Check that the Message store type is Data store.
3. Click [Additional Properties] Message store.
   The data store configuration detail panel is displayed.
4. Specify the following data store configuration details:

   Data source JNDI name

   Type the JNDI name of the data source that provides access to database that holds the data store.

   Schema name

   Type the name of the database schema that contains the tables used by the data store.

   General tip: The schema name is usually the same as the user ID that is declared in the authentication alias. With some databases, for example DB2®, you can provide an alternative schema name. For more information about the relationship between users and schema, refer to the documentation for your chosen RDBMS.

   Informix tip: When you configure your messaging engine to use an Informix® database, you must specify the schema name in lowercase letters.

   When it is starting, a messaging engine that uses a data store checks to see if its data store exists. If the Create tables option is selected for the configuration, the messaging engine creates the tables in its chosen schema.

   The Schema name field is optional. If you require a schema name, consider the following:

   • The default schema name is IBMWSSIB.
   • If you delete the text so that field is blank, the messaging engine takes the user id defined in the authentication alias to be the schema name.
   • If you define a schema name explicitly, that schema name is used by the messaging engine.
   • If there are multiple messaging engines, you must configure each messaging engine to use a unique schema, otherwise FFDC error messages stating that Connection cannot be provided as Datasource has been disabled! might appear. This applies to DB2 in particular.

   Authentication alias

   Select the authentication alias that enables access to the data source.

   Apache Derby Tip: When you create a new Network Attached Apache Derby data store, by default you get a blank authentication alias.

   Create tables

   Select the check box if you want WebSphere Application Server to create the database tables automatically.

   Note: The user ID that the messaging engine uses to connect to the data source must have sufficient authority to create the database tables and indexes.

   DB2 for z/OS restriction: Do not select Create tables if you are using DB2 for z/OS, otherwise an exception will be thrown when WebSphere Application Server attempts to create the tables.

   Restrict long running locks

   This parameter specifies whether the active messaging engine must retain long running locks on the SIBOWNER table in the database.

   Select the check box to restrict the active messaging engine from retaining long running locks on the SIBOWNER table in the database. When this option is selected, the messaging engine establishes a lock over the database only for short durations. In the event of the active messaging engine not responding to the database, the standby messaging engine will be able to take ownership of the database because the active messaging engine holds only short duration locks. This option also ensures that only one active messaging engine can access the database at a given time.

   Note: When the check box is selected and if the active messaging engine fails to communicate with the database or respond to the database, all the current transactions from the applications are ended and no new connections from the applications are allowed to the messaging engine.

   Number of tables for permanent objects

   Permanent tables contain persistent objects for the data store.

   Note: You can only increase the number of permanent tables, not decrease them.

   Avoid trouble: Number of tables for permanent objects plus the number of tables for temporary objects plus 1 must be less than or equal to 32.

   Number of tables for temporary objects

   Temporary tables contain nonpersistent objects that have been saved to the data store to reduce the messaging engine memory requirement.

   Note: You can only increase the number of temporary tables, not decrease them.

   Avoid trouble: Number of tables for permanent objects plus the number of tables for temporary objects plus 1 must be less than or equal to 32.