DWW0560W A record with a zero sequence number is found when switching logs and reading backward. Record nn2 on log dddd2 precedes record nn1 on log dddd1. Processing continues.

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A label record with a zero sequence number was found, and the record before it on the log (nn1) does not have the maximum sequence number (232-1). Record nn1 is the last record on log dddd1, and the zero record is the first record on log dddd2. 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 log data set is omitted when specifying the logs and the next log started with a zero record.
  • 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 a zero sequence number.
  • A log had data other than log records.

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

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CICS VR continues the backout.

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  • Batch–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 backout are present.

    If you omitted a log, archive this log and rerun CICS VR.

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

  • Online–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 backout are present.

    If you omitted a log, archive this log and rerun CICS VR.

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