ORA-00313: Lost redo logs file of the database in Oracle

ORA-00313: Lost redo logs file of the database in Oracle. This error occurs when one or more of the redo log files, which are crucial for the recovery and consistency of the database, become inaccessible or are missing. The loss of these files can lead to severe data integrity issues, as redo logs are responsible for recording changes made to the data, ensuring that even after a crash or instance failure, the database can be restored to its most recent state. It is essential for database administrators to closely monitor the integrity of redo logs and implement robust backup strategies to mitigate the risk of data loss and maintain operational stability. Regularly checking the log file locations and employing redundancy can help prevent such errors and ensure the database remains resilient against unexpected failures.

During open the database got the following error:

ORA-00313: open failed for members of log group 1 of thread 1
ORA-00312: online log 1 thread 1: '/u02/oradata/KSDQA/redo01.log'
ORA-27037: unable to obtain file status

Step 1. Start the database at mount state:

 -- Start the database.
 startup mount;

Step 2: Check the location of the redo log and add new log files

 alter database add logfile group 4 '/u02/oradata/KSDQA/redo04.log' size 250M;
 alter database add logfile group 5 '/u02/oradata/KSDQA/redo05.log' size 250M;
 alter database add logfile group 6 '/u02/oradata/KSDQA/redo06.log' size 250M;

Step 3: Start the database in open mode:

 alter database open;
 -- IF not then try with resetlog option:
 alter database open resetlogs;

Note: If even not start the database then go to step 4

Step 4: If the database is not up then proceed with the following steps:

create pfile from spfile;

Step 5: Take a cold backup of the database before proceeding:
Note: Take a full backup of all datafiles, which means copying the current datafiles into a new location

Step 6: Edit the PFILE and add the following parameters:

*.undo_management='MANUAL'
 _ALLOW_RESETLOGS_CORRUPTION = TRUE
 _ALLOW_ERROR_SIMULATION = TRUE

Remove the *.Undo_management='AUTO'

Step 7: Start database with new PFILE

Step 8: Start the following recover command:

recover database using BACKUP CONTROLFILE until cancel;
Ask for auto,cancel option:
CANCEL

Step 9: Finally open the database with reset logs:

alter database open resetlogs;

Step 10: Checked the redo log files are created in the location:

select * from v$logfile;

Step 11: Shutdown the database:

shutdown immediate;

Step 12: Start with SPFILE:

-- Start with SPFILE
startup 

Step 13: Remove the extra created group

alter database drop logfile group 1;
alter database drop logfile group 2;
alter database drop logfile group 3;