After configuring a JDBC data source, you can configure
a messaging engine data store to use the data source.
About this task
A messaging engine uses an instance of a JDBC data source
to interact with the database that contains the data store for that
messaging engine.
Use the WebSphere® Application Server administrative
console to set the data store configuration parameters.
Procedure
- In the navigation pane, click .
- Check that the Message store type is Data
store.
- Click [Additional Properties] Message store. The data store configuration detail panel is displayed.
- 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.
- 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.
- 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.