KEEP, CATALOG, and DELETE Operands

To specify what happens to the data set when it is deallocated, use the KEEP, CATALOG, and DELETE operands.

A data set is deallocated when you log off the system or you issue the FREE command. What happens to a data set after it is freed is called the disposition of the data set. You can specify the disposition of a new data set with the following operands:

KEEP specifies that the system retain the data set.
CATALOG specifies that the system store retrievability information about the data set in the master catalog.
DELETE specifies that the system delete the data set.

Example
`ALLOCATE DATASET(new.data) NEW DIR(4) BLOCK(800) SPACE(20,10) DSORG(po) RECFM(f,b) LRECL(80) BLKSIZE(3200) CATALOG`

For more information about data set attributes, see z/OS TSO/E Command Reference.