ORA-00312: online log 5 thread 1

I got ” ORA-00312: online log 5 thread 1 ”  error in Oracle database.

ORA-00312: online log 5 thread 1

Details of error are as follows.

SQL> alter database open resetlogs; 
alter database open resetlogs
*
ERROR at line 1:
ORA-00392: log 5 of thread 1 is being cleared, operation not allowed
ORA-00312: online log 5 thread 1: '/data/DEVECI/redologs/o1_mf_5_g11qrjms_.log'
ORA-00312: online log 5 thread 1: '/data/DEVECI/redologs/o1_mf_5_g11qrjoz_.log'

online log 5 thread 1

To solve this problem, you can clear related online log group like following.

You should change group number according to your environment.

SQL> alter database clear logfile group 5;

Database altered.

Or Sometimes you may need unarchive it, you can execute following script to solve.  You should change group number according to your environment.

SQL> alter database clear unarchived logfile group 1;

Database altered.

SQL> ALTER DATABASE CLEAR UNARCHIVED LOGFILE GROUP 1 UNRECOVERABLE DATAFILE ;

Database altered.

You should read the following post.

ORA-00283: recovery session canceled due to errors with ORA-00314 ORA-00312 via recover database until cancel

You should read the following post.

Managing Online Redo Log Files

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

Oracle Tutorial | Oracle Database Tutorials for Beginners ( Junior Oracle DBA )