How do you resolve redo log corruption?

How do you resolve redo log corruption?

Solution

1. Clear the archived group(corrupted) (alter database clear logfile group
2. If could not clear archived redolog then clear the redolog without archiving using(clear unarchived ) alter database clear unarchived logfile group group#

What is redo logs in Oracle?

Redo log files are operating system files used by Oracle to maintain logs of all transactions performed against the database. The primary purpose of these log files is to allow Oracle to recover changes made to the database in the case of a failure.

How do I resize a redo log in Oracle 11g?

How to resize redolog file in oracle

1. Step 1 : Check the Status of Redo Logfile.
2. Step 2 : Forcing a Checkpoint :
3. Step 3 : Drop Redo Log File :
4. Step 4 : Create new redo log file.
5. Step 5 : Now drop the remaining two old redo log file.
6. Step 6 : Create the redo log file.

How do I get rid of standby redo logs?

How to drop the standby redo logs

1. Enviroment.
2. SET STANDBY_FILE_MANAGEMENT=’MANUAL’
3. Drop SRL On Standby.
4. SET STANDBY_FILE_MANAGEMENT=’AUTO’
5. Enable MRP.
6. Enviroment.
7. SET STANDBY_FILE_MANAGEMENT=’MANUAL’
8. Drop SRL On Standby.

How do I restore a database using redo logs?

To perform time-based recovery:

1. Issue the RECOVER DATABASE UNTIL TIME statement to begin time-based recovery.
2. Apply the necessary redo log files to recover the restored datafiles.
3. Apply redo logs until the last required redo log has been applied to the restored datafiles.
4. Open the database in RESETLOGS mode.

Can I delete Oracle redo logs?

You can drop a redo log member only if it is not part of an active or current group. If you want to drop a member of an active group, first force a log switch to occur. Make sure the group to which a redo log member belongs is archived (if archiving is enabled) before dropping the member.

How do I resize the online redo log file?

Now drop redo log groups 1, 2, and 3: SQL> alter database drop logfile group 1; SQL> alter database drop logfile group 2; SQL> alter database drop logfile group 3; Verify the groups were dropped, and the new groups’ sizes are correct.

What happens to a redo log file in Oracle?

The oracle process will continue to write to the file – the file just won’t exist in the directory (the directory entry is gone) When the last process that has that redo01.log file opens it – because the directory entry is wiped it – the file data will become unlinked to – then the file is truly erased.

Where can I Find my ora9ir2 redo log file?

ORA-00313: open failed for members of log group 1 of thread 1 ORA-00312: online log 1 thread 1: ‘/home/ora9ir2/oradata/ora9ir2/redo01.log’ sys%ORA9IR2> shutdown ORA-01109: database not open Database dismounted. ORACLE instance shut down. sys%ORA9IR2> startup mount ORACLE instance started.

Can you mix redo log files from different databases?

LogMiner does not allow you to mix redo log files from different databases or to use a dictionary from a different database than the one that generated the redo log files to be analyzed. You must enable supplemental logging before generating log files that will be analyzed by LogMiner.

When does lgwr write to the redo log file?

When the last available redo log file is filled, LGWR returns to the first redo log file and writes to it, starting the cycle again. Figure 12-1 illustrates the circular writing of the redo log file. The numbers next to each line indicate the sequence in which LGWR writes to each redo log file.