Bypassing RLS processing (OW32817)

For SMS-managed VSAM data sets, DFSMSdss performs serialization that provides data integrity during logical dump and copy in both the RLS and the non-RLS environments. This serialization includes communications with VSAM RLS to determine the type of enqueues to be performed, based on the type of access that the data set is currently being used for by other jobs.

You can bypass the communication between DFSMSdss and VSAM RLS, which results in DFSMSdss performing non-RLS serialization, regardless of how the data set is currently being accessed. Use of this function can compromise data integrity when the data set is being accessed through RLS by some other job while the dump or copy is being performed. Use this function only if you are willing to tolerate the exposure of not having data integrity in order to force the successful completion of the operation or to prevent updates to the data set from failing during the operation.

When the communication between DFSMSdss and VSAM RLS is bypassed, communication with CICS® is also bypassed. Therefore, use this function should only in an environment where forward recovery logging and forward recovery is managed entirely by the application.

This function is affected by setting the flag at offset X'45' in ADRPATCH. The settings are listed below:

X'00': DFSMSdss functions normally. The communications with VSAM RLS are performed and DFSMSdss provides RLS or non-RLS serialization accordingly.
Any setting other than X'00': DFSMSdss bypasses RLS processing. The communications with VSAM RLS are not performed and DFSMSdss performs non-RLS serialization.

To set the flag to on dynamically, use the SET PATCH command. To set the flag to on permanently, modify the sample JCL (see Sample JCL) as follows:

//SYSIN DD *
   NAME ADRDSSU ADRPATCH
   VER   45        00
   REP   45        FF