IMS repository function migration considerations

There are several migration considerations related to the IMS repository enhancements.

Automatic export to the IMSRSC repository

If AUTOEXPORT=AUTO is specified in the DFSDFxxx member and IMS is enabled with the IMSRSC repository, autoexport to the IMSRSC repository is enabled at system checkpoints. To disable the autoexport to the IMSRSC repository function during migration to IMS 15, modify the DFSDFxxx member in one of the following ways:
  • Remove the AUTOEXPORT= specification so that AUTOEXPORT will default to AUTO and not trigger the autoexport to the IMSRSC repository. If IMS also has system RDDS, then autoexport will be done to the RDDS.
  • Modify to AUTOEXPORT=NO so that no autoexport is enabled.
  • Modify to AUTOEXPORT=RDDS so that autoexport is only to the system RDDS and not the IMSRSC repository.
Remember: Autoexport to the IMSRSC repository is not enabled if AUTOEXPORT=AUTO is defaulted to. You must explicitly specify autoexport in the DFSDFxxx member.

If you have AUTOEXPORT=AUTO defined with IMSRSC repository enabled and no system RDDS defined, IMS Version 13 and earlier will disable autoexport (AUTOEXPORT=N) since no system RDDS data sets are defined. A DFS3374W message is issued to indicate that autoexport is disabled.

If you have AUTOEXPORT=AUTO explicitly specified and not defaulted to with IMSRSC repository enabled and no system RDDS defined, IMS 15 will, at the end of the next checkpoint, export the changed definitions automatically since the last export to the IMSRSC repository.

If you have AUTOEXPORT=AUTO defined with IMSRSC repository enabled and system RDDS defined, IMS Version 13 and earlier will export the changed definitions automatically to the system RDDS at the end of the next checkpoint.

If you have AUTOEXPORT=AUTO defined with IMSRSC repository defined and system RDDS defined, IMS 15 will, at the end of the next checkpoint, export the changed definitions automatically since the last export to the IMSRSC repository. IMS will also export the changed definitions automatically to the system RDDS. The automatic export to the system RDDS will occur even if the automatic export to the IMSRSC repository did not succeed.

Create RDDS from Log Records utility (DFSURCL0) migration considerations

Run the same version of the DFSURCL0 utility as the version of the IMS that produced the IMS logs being used as input.

For example, use the IMS 15 DFSURCL0 utility with IMS 15 log data sets. If you run with mixed versions, the results can be unpredictable.