The UNLOAD control statement is used to unload the database to a sequential, output file for back-up purposes. The records in the database are written in ascending key-sequence order to the RMOUNLD data set as variable length records. The high-level name of the database must have been previously defined with the NAME control statement (or the PARM parameter of the EXEC JCL statement).
The UNLOAD control statement with an LOAD control statement can be used to reorganize the database and reclaim blocks in the database that are allocated but are not currently being utilized.
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