Adjusting VSAM options specified in the OPTIONS control statement

To adjust VSAM options, change the appropriate parameters in the OPTIONS control statement and put the new control statement in the appropriate data set.

The data set you put the control statement in depends on whether you have a batch or online IMS system.

In a batch system, use the DFSVSAMP data set
In an online system, use the IMS.PROCLIB data set with the member name DFSVSMnn

Detailed information on how to code these control statements is in IMS Version 15.2 System Definition.