ORA-01618: redo thread is not enabled – cannot mount

I got ” ORA-01618: redo thread is not enabled – cannot mount ” error in the Oracle database when i add new nodes to the Oracle RAC.

 

ORA-01618: redo thread is not enabled – cannot mount

Details of error are as follows.

SQL> startup
ORA-32004: obsolete or deprecated parameter(s) specified for RDBMS instance
ORACLE instance started.

Total System Global Area 2.6867E+11 bytes
Fixed Size 30150224 bytes
Variable Size 2.5770E+10 bytes
Database Buffers 2.4267E+11 bytes
Redo Buffers 207720448 bytes
ORA-01618: redo thread 3 is not enabled - cannot mount

 

 

 

redo thread 3 is not enabled – cannot mount

This ORA-01618 errors are related with the new node of Oracle RAC and missing thread and logfile of New added Oracle RAC Node.

 

I have added new 2 nodes to the Oracle RAC, Now We have 4 nodes RAC.

 

 

To solve this error, You need to enable the Node 3 and 4 Threads’ and Logfiles as follows.

 

SQL> alter database enable public thread 3;
alter database enable public thread 3
*
ERROR at line 1:
ORA-01613: instance UNNAMED_INSTANCE_3 (thread 3) only has 0 logs - at least 2
logs required to enable.


SQL> alter database enable public thread 4;
alter database enable public thread 4
*
ERROR at line 1:
ORA-01613: instance UNNAMED_INSTANCE_4 (thread 4) only has 0 logs - at least 2
logs required to enable.


SQL>

 

 

I got ORA-01613 error, because logfiles for the thread 3 and 4 should be added as follows.

 

SQL> alter database add logfile thread 3 group 11; 

Database altered.

SQL> alter database add logfile thread 3 group 12; 

Database altered. 

SQL> 

SQL> alter database add logfile thread 4 group 13; 

Database altered. 

SQL>

SQL> alter database add logfile thread 4 group 14; 

Database altered. 

SQL>

 

 

Now you can try to enable thread 3 and 4 as follows.

SQL> alter database enable public thread 3;

Database altered.

SQL> alter database enable public thread 4;

Database altered.

SQL>

 

Once you enabled the thread 3 and 4, you can startup the Node 3 and 4 as follows.

SQL> startup mount
ORACLE instance started.

Total System Global Area 2.6867E+11 bytes
Fixed Size 30150224 bytes
Variable Size 2.5770E+10 bytes
Database Buffers 2.4267E+11 bytes
Redo Buffers 207720448 bytes
Database mounted.
SQL>

 

 

If you want to learn more details about Oracle RAC Conversion, read the following post.

Convert Single Instance Oracle Database to Oracle RAC

 

 

Do you want to learn Oracle Database for Beginners, then read the following articles.

https://ittutorial.org/oracle-database-19c-tutorials-for-beginners/

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About Mehmet Salih Deveci

I am Founder of SysDBASoft IT and IT Tutorial and Certified Expert about Oracle & SQL Server database, Goldengate, Exadata Machine, Oracle Database Appliance administrator with 10+years experience.I have OCA, OCP, OCE RAC Expert Certificates I have worked 100+ Banking, Insurance, Finance, Telco and etc. clients as a Consultant, Insource or Outsource.I have done 200+ Operations in this clients such as Exadata Installation & PoC & Migration & Upgrade, Oracle & SQL Server Database Upgrade, Oracle RAC Installation, SQL Server AlwaysOn Installation, Database Migration, Disaster Recovery, Backup Restore, Performance Tuning, Periodic Healthchecks.I have done 2000+ Table replication with Goldengate or SQL Server Replication tool for DWH Databases in many clients.If you need Oracle DBA, SQL Server DBA, APPS DBA,  Exadata, Goldengate, EBS Consultancy and Training you can send my email adress [email protected].-                                                                                                                                                                                                                                                 -Oracle DBA, SQL Server DBA, APPS DBA,  Exadata, Goldengate, EBS ve linux Danışmanlık ve Eğitim için  [email protected] a mail atabilirsiniz.

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