Commitment control

Commitment control is a function that ensures data integrity. It allows you to define and process a group of changes to resources, such as database files or tables, as a transaction.

Commitment control ensures that either the entire group of individual changes occur on all systems that participate or that none of the changes occur. IBM^® DB2 Universal Database™ for iSeries™ uses the commitment control function to commit and rollback database transactions that are running with an isolation level other than *NONE (No Commit).

You can use commitment control to design an application so that the system can restart the application if a job, an activation group within a job, or the system ends abnormally. With commitment control, you can have assurance that when the application starts again, no partial updates are in the database due to incomplete transactions from a prior failure.

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• What's new for V5R4
  This topic highlights changes to commitment control for IBM i5/OS™ V5R4.
• Printable PDF
  Use this to view and print a PDF of this information.
• Commitment control concepts
  This topic provides information to help you understand how commitment control works, how it interacts with your system, and how it interacts with other systems in your network.
• Start commitment control
  To start commitment control, use the Start Commitment Control (STRCMTCTL) Command.
• End commitment control
  You can find what prerequisites are necessary to end commitment control and how to end commitment control in this topic.
• System-initiated end of commitment control
  The system can end commitment control, or perform an implicit commit or rollback operation. Sometimes the system-initiated end of commitment control is normal. Other times, commitment control ends with an abnormal system or job end.
• Manage transactions and commitment control
  Manage a system with commitment control by using these instructions.
• Scenarios and examples: Commitment control
  You can read scenarios and examples in this topic to see how one company sets up commitment control. Read code examples for programs that use commitment control.
• Troubleshoot transactions and commitment control
  You can read this information when you need to troubleshoot commitment control.
• Related information for commitment control
  Listed here are the product manuals and IBM Redbooks™ (in PDF format), Web sites, and information center topics that relate to the commitment control topic. You can view or print any of the PDFs.