If you set an item type's Persistence to Temporary, you must also specify the number of days of persistence. The status audit trail for each instance of a Temporary item type is maintained for at least 'n' days of persistence after its completion date. After the 'n' days of persistence, you can then use any of the WF_PURGE APIs to purge the item type's runtime status information. See: WF_PURGE.
Note: If you are using the version of Oracle Workflow embedded in Oracle Applications, you may also use the Purge Obsolete Workflow Runtime Data concurrent program to purge obsolete item type runtime status information. The executable name for this concurrent program is "Oracle Workflow Purge Obsolete Data" and its short name is FNDWFPR. See: Purge Obsolete Workflow Runtime Data.
Attention: Since Persistence Type is a feature that is introduced in Oracle Workflow Release 2.5, any item type defined in a release prior to 2.5 is automatically upgraded to have a Persistence Type of Temporary and 0 Days.