CICS VR replication logging

CICS® VR replication logging writes before-image and after-image log records to the replication log stream for every update made to a VSAM data set by a batch job. CICS VR batch logger shares forward recovery and replication logs if both forward recovery logging and replication logging are requested.

CICS VR logs VSAM before-image and after-image records to the replication log in the following format:
  • The before image, UNDO record, in the same format that is written to the CICS VR undo log.
  • The after image, REDO record, in the same format that is written to the forward recovery log. If both the forward recovery and replication are active, one record is written with both fljb_fwd_recovery bit set, and a new fljb_replication bit set.

Replication logging requires z/OS V1.13 plus maintenance. See Operating environment for more information.