About enabling partitions

Enabling a disabled partition makes it available for use by IMS again.

The procedure for enabling a partition for use in a HALDB database is essentially the same as the procedure for adding a new partition to a HALDB database. You can enable a disabled partition by issuing the DBRC command CHANGE.PART with the ENABLE parameter.

When you enable a HALDB partition, you can either enable the partition in conjunction with the unload and reload processes or you can restore the HALDB database to its state prior to the partition being disabled by using the recovery process.

If updates have been made to the database after the partition was disabled, you must use a time stamp recovery to recover the HALDB database. A time stamp recovery typically requires you to recover the entire HALDB database and all of its partitions, as well as any related HALDB databases.

When you enable a partition, DBRC flags the partition as needing recovery. If the HALDB database uses a partition selection exit routine, DBRC flags all of the partitions in the database as needing partition initialization. If the HALDB database uses high key partitioning, DBRC flags the partition with the next higher high key value as needing partition initialization.