What are the redo log files that are no longer required?

Redo log files that are no longer required for instance recovery are called inactive redo log files. If you have enabled archiving (the database is in ARCHIVELOG mode), then the database cannot reuse or overwrite an active online log file until one of the archiver background processes (ARCn) has archived its contents.

What are the archived redo log used for?

Archived redo logs are integral to maintaining a standby database, which is an exact replica of a database. You can operate your database in standby archiving mode, which automatically updates a standby database with archived redo logs from the original database.

How do I recover a corrupt redo log file?

Recovering After the Loss of All Members of an Online Redo Log Group

1. Locate the filename of the lost redo log in V$LOGFILE and then look for the group number corresponding to it.
2. Determine which groups are active.
3. If the affected group is inactive, follow the procedure in Losing an Inactive Online Redo Log Group.

How do I fix archive log full in oracle?

You can also fix this full problem by adding space to your archived redo log directory. For full scripts to monitor and remove archived redo logs, see the book “Oracle Shell Scripting” by Jon Emmons. The best on site “Oracle training classes” are just a phone call away!

What are archive logs?

The archive log contains copies of closed log files that had been in the active log. The archive log is not needed for normal processing, but it is typically needed for recovery of the database.

How do I restore a log file?

Simple steps to recover deleted LOG, Log File on Windows & Mac

1. Use your Mac or Windows computer to download and install the app.
2. Launch the app and select the disk on which recovery will be performed.
3. Select the Recover button in order to start scanning the disk for recoverable files.

How do I clean up archive logs?

How to delete old archive logs using RMAN Safely

1. Delete one day old archive logs RMAN > DELETE ARCHIVELOG ALL COMPLETED BEFORE ‘sysdate-1’;
2. Delete 30 day old archive logs RMAN > DELETE ARCHIVELOG ALL COMPLETED BEFORE ‘sysdate-30’;

How do I get rid of archive log?

Delete Archive Log Files from Oracle Database

1. Go to the Oracle server. Launch the command prompt.
2. Type: RMAN.
3. Type: connect target sys@SIDname.
4. Once connected to RMAN prompt, run the following command:
5. Then have RMAN run this:
6. Exit the command prompt.
7. Now run the backup job and verify that it is successful.

What is an archived redo log file?

An archived redo log file is a copy of one of the filled members of a redo log group. It includes the redo entries and the unique log sequence number of the identical member of the redo log group.

What information is included in a redo log?

It includes the redo entries and the unique log sequence number of the identical member of the redo log group. For example, if you are multiplexing your redo log, and if group 1 contains identical member files a_log1 and b_log1, then the archiver process (ARC n) will archive one of these member files.

How do I view archived redo logs in SQL*Plus?

The SQL*Plus command ARCHIVE LOG LIST displays archiving information for the connected instance. The database is currently operating in ARCHIVELOG mode. Automatic archiving is enabled. The archived redo log destination is D:\\oracle\\oradata\\IDDB2\\archive. The oldest filled redo log group has a sequence number of 11160.

What is the most common cause of archive log errors?

The most common cause is that an earlier archive log is missing or could not be applied, and hence we are “stuck” – we cannot proceed beyond that point. in case the standby database did not have correct information about the presence of the file.