Tech – Mainframe – Page 15

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ISPF Utilities: ISRFIND, ISRDDN and DDLIST

20th January 2014 Rui Miguel Feio

ISRFIND, ISRDDN and DDLIST are 3 of the most useful utilities under ISPF. ISRFIND and ISRDDN can be invoked as TSO commands, i.e., by issuing TSO ISRFIND and TSO ISRDDN on the ISPF command line. DDLIST on the other hand is an ISPF command table entry that invokes ISRDDN. This […]

What is a VSAM Volume Data Set (VVDS)?

7th November 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

2nd November 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

1st November 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 […]

Most Common Out-Of-Space Abends and Error Codes

2nd October 2013 Rui Miguel Feio

Although many other space related abends and error codes may occur, the truth is that some are more common than others. The following table lists the ones that fall under the most common out-of-space abends and error codes: Abend / Error Explanation B37-04 Insufficient space/extents on current volume and […]