Basic System DMS PROC › SELECT Command › DSCL SELECT CRITERIA Field Name Descriptions › F1CREDT — Format-1 DSCB create date (date format)

F1CREDT — Format-1 DSCB create date (date format)

Comparison dates can be entered in any acceptable CA Disk format. For all data sets, the value of F1CREDT is set to the value of the creation date field DS1CREDT in the format-1 DSCB of each data set or VSAM component. Missing or invalid values are assigned a value of 00/00/0000 or 0.

Under SCAN REALVOLS, the F1CREDT selection criteria will give increased performance over the CREDT selection criteria due to eliminating the need for CA Disk to access the catalog to retrieve the cluster name for VSAM components that do not meet this CREDT test.

The creation date in the format-1 DSCBs of components of VSAM clusters can provide different results compared to selection based on the creation date maintained in the cluster's catalog entry. Non-VSAM data sets are processed identically between CREDT and F1CREDT.

If you want to select VSAM clusters by the creation date in the cluster's catalog entry, while maintaining non-VSAM compatibility, use CREDT instead of F1CREDT.

This selection criteria is only valid when SCAN REALVOLS is used. It is ignored for SCAN CAT, unlike the CREDT selection criteria, which is valid for both. Another difference between F1CREDT and CREDT selection criteria is that F1CREDT can allow your CA Disk job to process more quickly. This faster processing occurs because F1CREDT is set up to allow CA Disk to bypass some catalog processing.

For more information, see Midnight "Rapid Aging" Problems.