ADG Instance crashed with ORA 29771 on standby database
(Doc ID 2254437.1)
Last updated on OCTOBER 17, 2023
Applies to:
Oracle Database - Enterprise Edition - Version 11.2.0.4 to 12.1.0.2 [Release 11.2 to 12.1]Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Backup Service - Version N/A and later
Information in this document applies to any platform.
Symptoms
Active dataguard instance crashed with below error
ORA-29771: process USER (OSID 26451) blocks LGWR (OSID 25719) for more than 70 seconds
Incident details in: /u01/app/oracle/diag/rdbms/###_TEST/TEST1/incident/incdir_378817/TEST_lmhb_25699_i378817.trc
USER (ospid: 26451) is blocking LGWR (ospid: 25719) in a wait
LMHB (ospid: 25699) kills USER (ospid: 26451).
Incident details in: /u01/app/oracle/diag/rdbms/###_TEST/TEST1/incident/incdir_378817/TEST_lmhb_25699_i378817.trc
USER (ospid: 26451) is blocking LGWR (ospid: 25719) in a wait
LMHB (ospid: 25699) kills USER (ospid: 26451).
Cause
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