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DASD MANAGER PLUS for DB2 12.1 Command and syntax reference

Execution

The Execution component performs the commands that are contained in the worklist that the product generates for change or migrate requests.
Although the tasks that are required to implement a worklist vary depending on the complexity of the actions involved, the Execution component handles the following basic functions:

  • Performs worklist control-command processing

  • Unloads Db2 data

  • Executes IBM or BMC Software utilities

  • Executes Db2 commands and Access Method Services (AMS) statements

  • Establishes synchronization (sync) points to accommodate restart, if needed

  • Creates diagnostic output in AEXPRINT

  • Performs audit and recovery logging, if requested

  • Performs authorization switching to ensure that Db2 objects are created with the correct owner and creator

The Execution component is the only component that makes physical changes to Db2 data structures.

Worklist control-command processing

The Execution component performs the following worklist control-command processing:

  • Evaluates the parameters that you generate from the Execution setup panels and uses them to control worklist processing

  • Verifies that the action exists under the subsystem ID (SSID) that you specified and makes connections to Db2 (as necessary) to validate or execute a worklist command

  • Checks the status of the job so that it does not execute a job twice and checks that the job requests restart or start over, if it previously stopped

  • Checks the hash values in the worklist and issues messages to flag user-modified commands or inserted commands to ensure command integrity

Important

If you manually add the HASHFAIL keyword to AEXIN, you can force run termination if Execution encounters these changes.

  • Verifies that the sequence number of each command is numeric, ascending, and unique

Restart and startover processing

Restart processing usually is caused by one of following items:

  • Worklist -STOP command

  • Error termination

The worklist -STOP command stops the worklist execution, allowing you to perform intermediate actions. When restarted, Execution runs the worklist from the statement immediately after the -STOP command.

Execution also supports a Restart from an error termination. If you restart Execution after correcting an error, Execution begins with the statement that caused the error. Specify Execution restarts by using the RESTART keyword. You can also specify that Execution starts running a worklist from the beginning by using the STARTOVER keyword.

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Last modified by Akanksha Sarpal on Jun 24, 2022
command_reference syntax reference

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Sample
Execution inputs (worklists)
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