Undo logging record prefix

The Undo logging record prefix is present in all Undo Start, Undo Read-for-Update/Erase, Undo Write-for-Add, and Undo End log records (record data).

The Start-of-Run (SOR) log record does not include this prefix.

Fields

unlr_eyecatcher - 8 bytes
A constant 'DWWUNLR ', written in all undo log records, except the start of run (SOR) log record.
unlr_rec_type - char(1)
Identifies the type of undo log record that is written. The allowable values are shown in Table 1.
Table 1. Identifiers for undo log record type
Undo start X'8F'
Undo read-for-update X'81'
Undo write-for-add X'83'
Undo end X'87'
unlr_rec_flags - char(3)
Contains a set of flags that indicate various states encountered during undo logging.
RESERVED - 4 bytes
Reserved bytes.
unlr_source_info -32 bytes
Contains a set of subparameters that specify identifier information related to undo logging. All undo log record types must specify a value for each of the subparameters.
unlr_cicsvrid - 8 bytes
The name of the CICS® VR instance that processed this log record.
unlr_jobid - 8 bytes
The JES job identifier of the batch job that started this instance of CICS VR undo logging.
unlr_jobname - 8 bytes
The name of the batch job that started this instance of CICS VR undo logging.
unlr_stepname - 8 bytes
The name of the batch job step that started this instance of CICS VR undo logging.
RESERVED - 16 bytes
Reserved bytes.