DFSMS provides an enhanced data integrity function for physical sequential (PS) data sets that you can activate using a SYS1.PARMLIB member. You can also exempt selected data sets from enhanced data integrity processing. When enhanced data integrity is active, if someone allocates a non-exempted physical sequential data set using DISP=SHR, and attempts to OPEN the data set for output, if the data set is already open for output DFSMS detects an error and abends the second OPEN attempt.

The RACF® database is allocated as a physical sequential data set. RACF processing ensures that using the RACF database does not cause abends due to enhanced data integrity processing. You do not need to exempt the RACF database from enhanced data integrity processing.