WebSphere Application Server Network Deployment, Version 6.1
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Creating the database for schedulers

Each scheduler requires a database in which to store its persistent information. Schedulers use this database for storing tasks and then running them. The choice of database and location should be determined by the application developer and server administrator.

Before you begin

Scheduler performance is ultimately limited by database performance. If you need more tasks per second, you can run the scheduler daemons on larger systems, use clusters for the session beans used by the tasks or partition the tasks by using multiple schedulers. Eventually, however, the scheduler database becomes saturated, and a larger or better-tuned database system is needed. For detailed information on scheduler topologies see the technical paper, "WebSphere Enterprise Scheduler planning and administration guide".

Multiple schedulers can share a database when you specify unique table prefix values in each scheduler configuration. This sharing can lower the cost of administering scheduler databases.

About this task

Complete the following steps to create scheduler databases.

Procedure

  1. Create a database. To create the database for a scheduler or to determine if an existing database is adequate for a scheduler, review the topic, "Create scheduler databases".
  2. Create the scheduler tables. There are three methods for creating the tables for a scheduler:
    1. Create tables for schedulers using the administrative console. Use the administrative console to add, delete and verify database tables through your Web browser. This method is ideal for developers and simple scheduler topologies.
    2. Create tables for schedulers using JMX or scripting.

      Use JMX to add, delete and verify database tables programmatically with Java or scripting. This method is ideal for automating scheduler configurations for simple scheduler topologies.

    3. Create tables for schedulers using DDL files. Manually edit the DDL files through your favorite text editor, and verify that mapping between the table names and the scheduler resources and data sources is correct.



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Last updated: Feb 25, 2009 9:32:38 AM CST
http://publib.boulder.ibm.com/infocenter/wasinfo/v6r1/index.jsp?topic=/com.ibm.websphere.nd.multiplatform.doc/info/ae/scheduler/tasks/tsch_database.html