Resize Log For Free

All members of the same multiplexed redo log group must be the same size. Members of different groups can have different sizes. However, there is no advantage in varying file size between groups.

Alter database add logfile instance 'ORCL_2' group 5 '+DATA' size 500m; alter database add logfile instance 'ORCL_2' group 6 '+DATA' size 500m; 5. Check the status and size increased to 500MB.

Ensure your redo log group is INACTIVE by querying V$LOG. If ACTIVE, switch the log (ALTER SYSTEM SWITCH LOGFILE) and wait until the status is INACTIVE. Next, drop the online redo log (with the ALTER DATABASE DROP LOGFILE GROUP x) command.

Resize Redo LogsCheck 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.More items...?Nov 2, 2018

Resize Redo LogsCheck 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.More items...?Nov 2, 2018

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. log.

We cannot resize the redo log files. We must drop the redolog file and recreate them .When a redo log member is dropped from the database, the operating system file is not deleted from disk. Rather, the control files of the associated database are updated to drop the member from the database structure.