ABCs of z/OS System Programming Volume 3 - IBM Redbooks

5.36 Creating a VSAM cluster
//VSAM DD DSN=NEW.VSAM,
// DISP=(,CATLG),
// SPACE=(1,(2,2)),AVGREC=M,
// RECORG=KS,KEYLEN=17,KEYOFF=6,
// LRECL=80
Figure 5-36 Creating a VSAM data class
NEW.VSAM
NEW.VSAM.DATA
NEW.VSAM.INDEX
Creating a VSAM data set using JCL
In the DFSMS environment, you can create temporary and permanent VSAM data sets using
JCL by using either of the following:
► The RECORG parameter of the JCL DD statement
► A data class
You can use JCL DD statement parameters to override various data class attributes; see
Table 5-2 on page 298 for those related to VSAM data sets.
Important: Regarding DISP=(OLD,DELETE), in an SMS environment, the VSAM data set
is deleted at unallocation. In a non-SMS environment, the VSAM data set is kept.
A data set with a disposition of MOD is treated as a NEW allocation if it does not already
exist; otherwise, it is treated as an OLD allocation.
For a non-SMS environment, a VSAM cluster creation is only done through IDCAMS. In
Figure 5-36, NEW.VSAM refers to a KSDS VSAM cluster.
Chapter 5. System-managed storage 299