You can use one of the following subparameters of the RLS parameter to specify a read integrity option for a VSAM data set.

NRI

Specifies no read integrity (NRI). The application can read all records.

CR

Specifies consistent read (CR). This subparameter requests that VSAM obtain a SHARE lock on each record that the application reads.

CRE

Specifies consistent read explicit (CRE). This subparameter requests serialization of the record access with update or erase of the record by another unit of recovery.

CRE gives DFSMStvs access to VSAM data sets open for input or output. CR or NRI gives DFSMStvs access to VSAM recoverable data sets only for output.

Related reading:

• For information about how to use these read integrity options for DFSMStvs access, see z/OS DFSMStvs Planning and Operating Guide.
• For complete descriptions of these subparameters, see the description of the RLS parameter in z/OS MVS JCL Reference.