Exception processing modes

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This section describes the two basic types of exception processing available: periodic exception processing and exception event processing.

Periodic exception processing

Use periodic exception processing to periodically monitor thread activity fields and statistics fields for exception conditions. This processing mode runs in the background of online monitoring processing.

With periodic exception processing, data is tested for exception whenever the interval that you specified has elapsed (whether or not you are viewing the relevant data). If any Problem level exceptions are detected, the Exception Notification window is displayed. If only Warning level exceptions are detected, a message is displayed to notify that a periodic exception has occurred. This window is overlaid on the current panel and shows the number of periodic exceptions detected during the interval. The exception notifications are stored and can be examined using the LOOK command.

If the data collector is active, periodic exception processing can continue when you exit the online monitoring panels. The next time you use online monitoring panels, any periodic exceptions that were detected while you were not logged on are displayed. Periodic exception processing is not terminated until you stop it or until the data collector itself is terminated. If the data collector is not active, periodic exception processing terminates when you exit the online monitoring panels.

Exception event processing

Use exception event processing to monitor the Db2® subsystem for the occurrence of particular events. This processing mode runs in the background of online monitoring processing. The following events can be monitored:
  • Deadlock
  • Timeout
  • EDM pool full
  • Authorization failure
  • Thread commit indoubt
  • CF rebuild/alter start
  • CF rebuild/alter end
  • Global trace started
  • Data set extension
  • Unit of recovery problem
  • Log space shortage

The events must be specified with the EVENTOBSERVATION data collector parameter or in the Data Collector Parameters window before exception event processing can be activated from the Exception Processor panel. For more information, see the IBM® Db2 for z/OS® in IBM Documentation.

When an exception event is detected, the Exception Notification window is displayed to notify you that an exception event has occurred. Exception event notifications are stored and can be examined using the LOOK command.