Troubleshooting administrative task scheduler

This checklist can help you troubleshoot problems that occur while running tasks in the administrative task scheduler.

1. If your task does not execute as expected, the first thing you should do is look for a execution status record in the ADMIN_TASK_STATUS administrative view.
   • If there is a record, examine the various values. In particular, pay attention to the STATUS, INVOCATION, SQLCODE, SQLSTATE, SQLERRMC and RC columns. The values often identify the root cause of the problem.
   • If there is no execution status record in the view, the task did not execute. There are a number of possible explanations for this:
     • The administrative task scheduler is disabled. Tasks will not execute if the administrative task scheduler is disabled. To enable the scheduler, set the DB2_ATS_ENABLE registry variable.
     • The task was removed. Someone may have removed the task. Confirm the task exists by querying the ADMIN_TASK_LIST administrative view.
     • The scheduler is unaware of the task. The administrative task scheduler looks for new and updated tasks by connecting to each active database every five minutes. Until this period has elapsed, the scheduler is unaware of your task. Wait at least five minutes.
     • The database is inactive. The administrative task scheduler cannot retrieve or execute tasks unless the database is active. Activate the database.
     • The transaction is uncommitted. The administrative task scheduler ignores uncommitted tasks. Be sure to commit after adding, updating, or removing a task.
     • The schedule is invalid. The task's schedule might prevent the task from running. For example, the task may have already reached the maximum number of invocations. Review the task's schedule in the ADMIN_TASK_LIST view and update the schedule if necessary.
2. If you cannot determine the cause of the problem by referring to the ADMIN_TASK_STATUS administrative view, refer to the DB2® diagnostic log. All critical errors are logged to the db2diag log file. Informational event messages are also logged by the administrative task scheduler daemon during task execution. These errors and messages are by identified by the "Administrative Task Scheduler" component.