What is a VSAM Volume Data Set (VVDS)?

November 7, 2013 Rui Miguel Feio

VVDS stands for VSAM Volume Data Set and it’s a VSAM file that contains the information of all VSAM and SMS-managed non-VSAM data sets that reside on the volume where the VVDS file is allocated. A VVDS is recognised by the restricted data set name SYS1.VVDS.Vvolser, where volser is the volume […]

Change Data Set SMS Information

November 2, 2013 Rui Miguel Feio

Sometimes we come across the need of changing the SMS information of a data set. The question of course is: how can we do it? Well, an easy way is to do it via batch job using the IDCAMS utility and the ALTER command: //SMSCHG EXEC PGM=IDCAMS //SYSPRINT DD SYSOUT=* […]

Choosing Between PADCHK And NOPADCHK Operands

November 1, 2013 Rui Miguel Feio

When setting up program control protection in RACF via the PROGRAM general resource class, you have the option to specify if the profile is to be PADCHK or NOPADCHK.   PADCHK  This is the default. With PADCHK, RACF will check for Program-Accessed Data Sets (PADS) that are already open before executing […]