DWW0454W

An unexpected zero sequence number is found when reading forward on log dddd. The preceding record is nn1. Processing continues.

A label record with a zero sequence number was found, and the record before it (nn1) does not have the maximum sequence number (232-1). Both records are on log dddd. Some possible causes are:
  • The sequence number was reset to zero by CICS®. If you do not have a journal archive control data set (JACD), CICS® resets the sequence number at every cold start and warm start. CICS® VR functions correctly in this situation.
  • A zero sequence number occurred because the JACD is damaged or lost. CICS® VR functions correctly in this situation.
  • A log was skipped during archiving, and the next log started with a record with zero sequence number.
  • A log contained data other than log records.

This message is issued if command SEQCHKR RESETSEQUENCE(WARNING) is specified, or if WARNING is specified in the sequence checking secondary window.

CICS® VR continues the recovery.

  • Batch–If the sequence number was reset to zero because you are not using a JACD, no action is required.

    If you are using a JACD, find out why the zero sequence number occurred. If the JACD is damaged or lost, no action is required. If a log was skipped during archiving, rerun CICS® VR after archiving the log. In other cases, check the contents of the log to see whether all records needed for recovery are present.

    Remember to restore the VSAM data sets from the backup copies before you rerun CICS® VR.

  • Online–If the sequence number was reset to zero because you are not using a JACD, no action is required.

    If you are using a JACD, find out why the zero sequence number occurred. If the JACD is damaged or lost, no action is required. If a log was skipped during archiving, rerun CICS® VR after archiving the log. In other cases, check the contents of the log to see whether all records needed for recovery are present.

    Remember to restore the VSAM data sets from the backup copies before you resubmit the recovery job.