How do I change the size of my redo log?

select group#, status from v$log; You may have to run the alter command up to three times to get group 1 to be CURRENT. Repeat steps 1 to 7 for group 2, group 3, and group 4. Confirm the size change to each group is now 165 Mb.

How do I resize a redo log in Oracle 10g?

How to resize redolog file in oracle

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

What is the minimum size permitted for a redo log file?

4 MB
The minimum size permitted for a redo log file is 4 MB. See Also: Your operating system–specific Oracle documentation. The default size of redo log files is operating system dependent.

How do I restore a redo log file?

To recover from loss of an active online redo log group in ARCHIVELOG mode:

Begin incomplete media recovery.
Ensure that the current name of the lost redo log can be used for a newly created file.
Open the database using the RESETLOGS option:

How do I resize a redo log in Oracle?

Resize Redo Logs

Check Current Redo Logs.
Add 3 Groups with New Size (1GB)
Switch Logfile to New Groups.
Force a CheckPoint.
Drop Group 1, 2, 3.
Remove Redo Log Files.
Add Group 1, 2, 3 with New Size (1GB)
Switch Logfile Several Times.

How do I resize a redo log in standby database?

Following are the steps to drop and create new standby database:

Check Primary Redo Thread Number and size.
Check Standby Thread number and Size for Standby redo logs.
Stop the data-guard recovery process in Standby database:
Drop the existing Standby redo files:
Create new Standby logfile with THREAD Clauses.

What size should redo log be?

Dell EMC recommends redo log group members sized between 512 MB to 2 GB for demanding OLTP systems. If the DBA is concerned that a larger redo log group will result in insufficient switching during non-peak period, the archive_lag_target parameter should be set to force periodic switching.

How many maximum redo logfiles one can have in a database?

Post 10.2. 0 oracle specified that there is no limitations in the number of redo logfiles,where the controlfiles will extends its size if the more number of redo logfiles created irrespective to the MAXLOGFILES specified. Oracle database is Oracle’s flagship product.

What will happen if redo log file was corrupted?

A redo log file might become corrupted while the database is open, and ultimately stop database activity because archiving cannot continue. In this situation the ALTER DATABASE CLEAR LOGFILE statement can be used to reinitialize the file without shutting down the database.

How to check the size of the Oracle redo log?

Query V$LOG view to determine the current size of the redo log members. Record the number of log switches per hour. Increase the log file size so that Oracle switches at the recommended rate of one switch per 15 to 30 minutes. You can also check messages in the alert log in order to determine how fast Oracle is filling and switching logs.

How big should a redo log file be?

Suppose if your database redo log file size is set to 1MB. It means that Oracle switches the logs every 1 minute. So you will need to increase the size of redo log file to 30MB so that Oracle switches per 30 minutes. It is also recommended to ensure that your online redo log files do not switch too often during high activity time.

What does inactive redo log file in Oracle mean?

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.

How big should an oracle log file be?

Record the number of log switches per hour. Increase the log file size so that Oracle switches at the recommended rate of one switch per 15 to 30 minutes. You can also check messages in the alert log in order to determine how fast Oracle is filling and switching logs.