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Standby Database Got ORA-03170: Deadlocked; Pmon Not Able To Clean Up (Doc ID 2134423.1)

Last updated on JULY 06, 2019

Applies to:

Oracle Database - Enterprise Edition - Version to [Release 12.1]
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A and later
Information in this document applies to any platform.


The following errors reported on Active Data Guard physical standby over and over:

  Errors in file /u01/oracle/diag/rdbms/<DB_NAME>/<INSTANCE_NAME>/trace/<INSTANCE_NAME>_pmon_41746880.trc:
  ORA-03170: deadlocked on readable physical standby (undo segment 65535)

And the pmon trace contains call stack: krdwtadv()<-ktuGetUsegDba()<-ktugin_cr()

NOTE! in some cases eg when converting to snapshot standby, dg broker might give a message of ORA-03170 in alert log, but it could be resolved automatically by dg broker and the error can be ignored in that case and not be applicable to this case.


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