When Microsoft Provisioning Framework (MPF) executes a request, it writes a transaction identifier (ID) to the transaction log database for each successful step in the request. If the request fails at any point, MPF rolls back the entire transaction as follows:

• MPF retrieves the transaction IDs from the transaction log database and rolls back the steps in the reverse order in which they were executed.
• MPF can reverse changes made by the request prior to the failure of the transaction if the namespace and provider make use of this capability.
• MPF can return systems, services, and databases to their previous states if the namespace and provider make use of this capability.

For more information about MPF error handling, see "Auditing and Recovery Managers" in Provisioning Manager Help.