Prime Data Area

To request that the system allocate space and subdivide it as required, you should code your data definition as follows:

//ddname DD DSNAME=dsname,DCB=DSORG=IS,
//          SPACE=(CYL,quantity,,CONTIG),UNIT=unitname,
//          DISP=(,KEEP),---

You can accomplish the same type of allocation by qualifying your dsname with the element indication (PRIME). The PRIME element is assumed if it is omitted. It is required only if you request an independent index or an overflow area. To request an imbedded index area when an independent overflow area is specified, you must specify DSNAME=dsname(PRIME). To indicate the size of the imbedded index, you specify SPACE=(CYL,(quantity,,index size)).