DS 5.2P6 - Instance will not start with a bad transaction (txn) log file - Error Reports: magic number 0, not NNN (Doc ID 1288085.1)

Symptoms

Customer had the Backup Restore Team restore the LDAP instance DB directory from earlier date.
After RESTORE of db file system the server instance fails to initialize.

Errors:
[26/Jan/2011:06:45:01 -0600] - Sun Java(TM) System Directory Server/5.2_Patch_6 B2007.221.1746 (64-bit) starting up
[26/Jan/2011:06:45:02 -0600] - WARNING<20488> - Backend Database - conn=-1 op=-1 msgId=-1 - Detected Disorderly Shutdown last time Directory Server was running, recovering database.
[26/Jan/2011:06:45:02 -0600] - DEBUG - conn=-1 op=-1 msgId=-1 - libdb: region error detected; run recovery.
[26/Jan/2011:06:45:03 -0600] - DEBUG - conn=-1 op=-1 msgId=-1 - libdb: Ignoring log file: $PATH_TO/slapd-instance/db/log.NNNNNN: magic number 0, not NNN
[26/Jan/2011:06:45:03 -0600] - DEBUG - conn=-1 op=-1 msgId=-1 - libdb: PANIC: Invalid argument
[26/Jan/2011:06:45:03 -0600] - ERROR<20490> - Backend Database - conn=-1 op=-1 msgId=-1 - Database Recovery Process FAILED. The database is not recoverable.
[26/Jan/2011:06:45:03 -0600] - ERROR<20749> - Backend Database - conn=-1 op=-1 msgId=-1 - start: Failed to init database, err=-30989 DB_RUNRECOVERY: Fatal error, run database recovery

Changes

Cause

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