Enabling an IMS subsystem for FDBR

To reduce the amount of time the sharing subsystems must wait, you can use Fast Database Recovery (FDBR) regions to enable DB/DC and DBCTL subsystems.

Enabling a DB⁄DC subsystem for FDBR

To enable a DB⁄DC subsystem for FDBR, specify the FDRMBR= parameter in the IMS procedure. The FDRMBR= parameter defines the DB⁄DC system as FDBR-capable.

Note the IMSID of the IMS system that FDBR is to track. Specify this IMSID in the control statement for the DFSFDRxx member of the IMS PROCLIB data set. Match the IMSID to the ID that is specified for the IMSID EXEC parameter.

Restrictions:
  • If both FDRMBR= and HSBID= (XRF configuration) parameters are specified in the IMS procedure, the FDRMBR= parameter is ignored.
  • For Fast Path systems using FDBR, the Fast Path buffer managers for the tracking system and the active system must be the same: both must be 64-bit or both must be 31-bit. Make sure that the tracking system and the active system have the same value for the FPBP64= parameter of the DFSDFxxx member of the IMS PROCLIB data set.

Enabling a DBCTL subsystem for FDBR

To enable a DBCTL subsystem for FDBR, specify the FDRMBR= parameter in the DBC procedure. The FDRMBR= parameter defines the DBCTL system as FDBR-capable.

Note the IMSID of the IMS system that FDBR is to track. Specify this IMSID in the control statement for the DFSFDRxx member of the IMS PROCLIB data set. Match the IMSID to the ID that is specified for the IMSID EXEC parameter.

Restrictions:
  • If both FDRMBR= and DBRSE= (DBCTL standby configuration) parameters are specified in the DBC procedure, the FDRMBR= parameter is ignored.
  • For systems using Fast Database Recovery (FDBR), the buffer manager of the tracking system must be the same as the buffer manager of the active system.