How do I turn off redo log?

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As of MySQL 8.0. 21, you can disable redo logging using the ALTER INSTANCE DISABLE INNODB REDO_LOG statement. This functionality is intended for loading data into a new MySQL instance. Disabling redo logging speeds up data loading by avoiding redo log writes and doublewrite buffering.

How do I reduce the redo log in Oracle?

Use the following steps to update redo log size and files:

Log in to the database node/VM (rp2vm2) as oracle user.
Connect to sqlplus.
Update redo log file size and increase groups using the steps captured below.
Switch the log file to the newly added redo log groups and delete the old inactive groups.

What is the purpose of redo log files Oracle?

Redo entries record data that you can use to reconstruct all changes made to the database, including the undo segments. Therefore, the redo log also protects rollback data.

How do I move the redo log in Oracle 12c?

How to relocate the redo log files to a different location on…

Shut down the database.
Copy the online redo log files to the new location.
Startup the database in mount mode, but do not open it.
Rename the online redo log members.
Open the database for normal operation.

Can we delete redo log files?

It is permissible to drop redo log files so that a multiplexed redo log becomes temporarily asymmetric. For example, if you use duplexed groups of redo log files, you can drop one member of one group, even though all other groups have two members each.

How do you find the redo log size?

You can view the redo_buffer_allocation_retries in V$SYSSTAT to see if your redo log files are too small. There are two ways to see the frequency of log switches, the v$loghist view and looking at the Oracle alert.

What will happen if redo log file was corrupted?

Explanation: If an online redo log file has been corrupted while the database is open, the ‘alter database clear logfile’ command can be used to clear the files without the database having to be shutdown. The command erases all data in the specified logfile group.

How many redo log files does Oracle Database use?

Oracle Database uses only one redo log files at a time to store redo records written from the redo log buffer. The redo log file that LGWR is actively writing to is called the current redo log file. Redo log files that are required for instance recovery are called active redo log files.

How do I drop a redo log group in Oracle?

Drop a redo log group with the SQL statement ALTER DATABASE with the DROP LOGFILE clause. When a redo log group is dropped from the database, and you are not using the Oracle Managed Files feature, the operating system files are not deleted from disk.

How does the database properly apply redo log files in ascending order?

During crash, instance, or media recovery, the database properly applies redo log files in ascending order by using the log sequence number of the necessary archived and redo log files.

What is an inactive redo log file?

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 (ARC n) has archived its contents.