Syntax

UNLOAD reserve-option history-option

where:

reserve-option

Specifies RESERVE to place a reserve on the database for the duration of the unload. If omitted, no reserve is placed on the database.

Note: Do not specify NORESERVE; it is not a valid option for the unload.

history-option

Deletes detail history when you unload a database.

You can specify only HISTDELALL to delete the detail history subfile and all basic history.

Note:

When converting databases, if you specify a value for the BLKSIZE operand in the ADDDS control statement that is smaller than was originally specified for the "from" database, specify a value for history-option.
Back up your CA Deliver data sets regularly. You can recover your database with the LOAD control statement, which automatically reorganizes a database when restoring it. You can use IEBCOPY or any partitioned data set copy utility to back up (and recover) partitioned data sets such as the model banner page library.