Toad World Blog

ORA-19527: physical standby redo log must be renamed

Apr 1, 2021 1:59:00 PM by Syed Jaffar Hussain

Data Guard was configured a few days back at one of the customers site. An ORA-19527 error is continuously reported in the standby database alert.log (database name is changed)


Errors in file /u01/app/oracle/diag/rdbms/orcl/ORCL1/trace/ORCL1_rfs_3504.trc:

ORA-19527: physical standby redo log must be renamed
ORA-00312: online log 9 thread 1: '+DATAC1/ORCL/ONLINELOG/group_9.459.960055023'
Though this didn't stop the data guard replication, the customer wanted to get-rid the message. Starting with v10g, this was an expected behavior to improve the switchover and failover. With v10g, when MRP is started, it will attempt to clear the online log files.

This is also an expected behavior when the log_file_name_convert parameter is set on the standby database. But, in our case, the log_file_name_convert was not required as PRIMARY and STANDBY has the same directory structure (DISK GROUPS for DATA and RECO).

The workaround to get rid of the message, when there is no different in the directory structure, is just to set some dummy values to the parameter, as shown in the below example:

SQL> ALTER SYSTEM SET log_file_name_convert='dummy','dummy';

After the parameter was set, the ORA message was no longer seen in the alert.log

ORA-19527 reported in Standby Database when starting Managed Recovery (Doc ID 352879.1)
ORA-19527: Physical Standby Redo Log Must Be Renamed...during switchover (Doc ID 2194825.1)


Tags: Oracle

Syed Jaffar Hussain

Written by Syed Jaffar Hussain

An Oracle Database Expert for over 15 years from his 20 years of Information Technology (IT) career. Over the past 15 years of Oracle journey, he involved with several local and large scaled international banks where he implemented and managed highly complex cluster and non-cluster environments with over 100’s of business critical databases. Recognizing his efforts and contribution towards the Oracle community, Oracle awarded him the prestigious ‘Best DBA of the year, 2011’ and Oracle ACE Director status. He also acquired industry best Oracle credentials, Oracle Certified Master (OCM), Oracle RAC Expert, OCP DBA 8i,9i,10g & 11g in addition to ITIL Expertise.

Syed is an active Oracle speaker, regularly presents technical sessions and webinars on various Oracle database technologies at many Oracle events. You can visit his technical blog, where he discuss and writes the workaround/solution about the issues confronted from his day-to-day activities. Apart from being the part of the core Technical Review committee member for a few Oracle technology oriented books, he also co-authored an Oracle 11g R1/R2 Real Application Cluster Essentials and Oracle Expert RAC books. His blog can be found at