//ALLOC JOB ...
//STEP1 EXEC PGM=IDCAMS
//SYSPRINT DD SYSOUT=A
//SYSIN DD *
ALLOC -
FILE(ddname)
NEW -
RECORG(ES)
*/
If no DSNAME name is specified, the system generates one. If no STORCLAS name is specified, and your storage administrator has provided an ACS routine, the ACS routine can select a storage class.