Do not alter the job queue entry settings in the QMQM subsytem to limit the number of jobs allowed in the subsystem by priority. If you attempt to do this, you can stop essential WebSphere(R) MQ jobs from running after they are submitted and cause the queue manager startup to fail.
To understand how to configure work management, you must first understand how WebSphere MQ uses job descriptions.
The job description used to start the job controls many attributes of the job. For example:
The process of starting a WebSphere MQ job can be considered in three steps:
WebSphere MQ uses the following technique to determine which job description to use for a batch job:
Job descriptions supplied with WebSphere MQ have been set up, by default, to put jobs on to job queue QMQM in library QMQM. The QMQM job queue is attached to the supplied QMQM subsystem, so by default the jobs start running in the QMQM subsystem.
When the job enters the subsystem, the routing data specified on the job description is used to find routing entries for the job.
The routing data must match one of the routing entries defined in the QMQM subsystem, and this defines which of the supplied classes (QMQMRUN20, QMQMRUN35, or QMQMRUN50) is used by the job.
If you have modified the WebSphere MQ work management objects, make sure everything is associated correctly. For example, if you specify a job queue other than QMQM/QMQM on the job description, make sure that an ADDJOBQE is performed for the subsystem, that is, QMQM.
You can create a job description for each job documented in Table 1 using the following worksheet as an example:
What is the queue manager library name? ___________ Does job description AMQZXMA0 exist in the queue manager library? Yes No Does job description QMQMJOBD exist in the queue manager library? Yes No Does job description AMQZXMA0 exist in the QMQM library? Yes No Does job description QMQMJOBD exist in the QMQM library? Yes No
If you answer No to all these questions, create a global job description QMQMJOBD in the QMQM library.
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