Specifies what requests are allowed to be processed by system job. (QDBFSTCCOL)
Allow background database statistics collection, also known as QDBFSTCCOL, is a member of the performance category of i5/OS™ system values. You can use this system value to specify the types of requests for database file statistics collection that are allowed to be processed by system job, QDBFSTCCOL. To learn more, keep reading.
| Quick reference | |
|---|---|
| Location | In iSeries™ Navigator, select your system, |
| Special authority | None |
| Default value | Allow user-created and system-generated database statistics |
| Changes take effect | Immediately |
| Lockable | No |
Specifies the types of requests for database file statistics collection that are allowed to be processed by system job, QDBFSTCCOL. Statistical collections which are requested by either a user or automatically by the database manager to be processed in the foreground are not affected by this system value.
The creator of a database file statistics collection request can specify either immediate or background processing. When immediate is specified, the statistics collection will be performed within the requester's process and control is not returned until the statistics collection is complete. The processing of immediate statistics collection requests are not affected by the setting of this system value. However, when background is specified, the request is queued to system job, QDBFSTCCOL, and control is returned immediately to the requesting process.
System job, QDBFSTCCOL, can select to process requests from either user-created requests, system-generated requests, or both based on the value of this system value. Requests which are not selected will remain queued until either the system job is ready to process the request or the system value is changed to allow requests of that type to be processed.
When this system value is changed to a more restricted value, the processing of statistic collection requests in progress in the statistics system job, that are not allowed at the new value, is ended. Their processing is restarted when this system value is changed back to a value that allows their processing.
You may select one of the following types of requests, both (*ALL) types, or neither (*NONE):
To learn more, go to the performance system values overview topic. If you are looking for a specific system value or category of system values, try using the i5/OS system value finder.