Resetting the data-set-changed indicator and last backup date
After each data set is backed up, if the backup was serialized,
the data-set-changed indicator is turned off in the data set's
VTOC entry on the source volume. The data-set-changed indicator is
also turned off for data sets that are not serialized, if DFSMShsm
has been configured not to serialize on the first attempt to back
up.
Note: For non-VSAM multivolume data sets, the data-set-changed
indicator is reset on each volume that the data set is cataloged to.
No serialization is an option of the ARCHBACK user macro and the ARCBDEXT installation exit. However, the ARCINBAK inline backup program always specifies this option, because it expects the JCL to perform its own serialization. In addition, the current date is written in the catalog entry and in the last backup date field in its own MCB record.