TSO-ISPF JCL COBOL VSAM DB2 CICS Tools Articles Job Portal Forum Quiz Interview Q&A

VSAM - Alter Command


ALTER command is used to modify VSAM file attributes. We can change the attributes of VSAM file which we have mentioned in VSAM Cluster definition.

Syntax:

ALTER  file-cluster-name [password]
   [ADDVOLUMES(volume-serial)]
   [BUFFERSPACE(size)]
   [EMPTY / NOEMPTY]
   [ERASE / NOERASE]
   [FREESPACE(CI-percentage CA-percentage)]
   [KEYS(length offset)]
   [NEWNAME(new-name)]
   [RECORDSIZE(average maximum)]
   [REMOVEVOLUMES(volume-serial)]
   [SCRATCH / NOSCRATCH]
   [TO(date) / FOR(days)]
   [UPGRADE / NOUPGRADE]
   [CATALOG(catalog-name [password]]

The syntax parameter description remains the same as we explained in VSAM - Define Cluster Syntax chapter.

Example:

Following example shows how to use ALTER command to increase Freespace, to add more volumes and to Alter Keys.

//JOBNAME1 JOB 'IBMMAINFRAMER',CLASS=C,PRTY=10,MSGCLASS=C,
//         MSGLEVEL=(1,1),NOTIFY=&SYSUID
//*
//STEP001  EXEC PGM=IDCAMS
//SYSPRINT  DD  SYSOUT=*
//SYSIN DD  *
   ALTER  racfid.VSAM.KSDSFILE.TEST
   [ADDVOLUMES(5)]
   [FREESPACE(4 4)]
   [KEYS(5 3)]
/*

If you execute the above JCL. Job should complete successfully with MAXCC = 0 and it will alter the Freespace, Volumes and Keys.


If you have any doubts or queries related to this chapter, get them clarified from our Mainframe experts on ibmmainframer Community!

Are you looking for Job Change? Job Portal