Considerations for HALDB Online Reorganization capable partitions

IMS High Performance Unload supports HALDBs. IMS High Performance Unload supports also the PHDAM or the PHIDAM partitions that are defined as HALDB Online Reorganization (OLR) capable.

However, if one or more partitions are in the following HALDB OLR status, IMS High Performance Unload cannot process the HALDB:
  • HALDB OLR is currently running.
  • HALDB OLR for the partition is suspended and one of the following options is specified for FABHURG1 or FABHFSU:
    • DECN
    • User exit routine
    • *CS format for PHDAM
    • PARTEXTR

When none of these options is specified, IMS High Performance Unload can process the partition. However, the following options for the HSSR Engine are ignored:

  • BYINDEX
  • CO
  • DBSTATS
  • KEYCHECK
  • SKERROR
Because the DBSTATS control statement is ignored, the following reports are not printed:
  • DB Statistics report
  • Randomizing Statistics report
  • DB Record Length Distribution report
The CAB Statistics report for the partition of which HALDB OLR is suspended and partitions that follow this partition are not printed.

In this case, the performance decreases because the HSSR Engine passes the DL/I calls to the IMS's DL/I call handler from the partition. Consider running IMS High Performance Unload after the completion of the HALDB OLR.