Read Only VSM Files

By using INHIBIT along with ALTER command, we can have a read-only VSAM dataset.

Example:

//STEP1 EXEC PGM=IDCAMS
//SYSPRINT DD SYSOUT=*
//SYSIN DD *
ALTER –
SECRET.KSDS.DATA –
INHIBIT
ALTER –
SECRET.KSDS.INDEX –
INHIBIT
/*

Notice that the ALTER command is used with DATA and INDEX and not with the cluster.