How do I drop a redo log group in Oracle 12c?

To drop specific inactive redo log members, use the ALTER DATABASE statement with the DROP LOGFILE MEMBER clause. The following statement drops the redo log /oracle/dbs/log3c. rdo : ALTER DATABASE DROP LOGFILE MEMBER '/oracle/dbs/log3c.

Also asked, how do I drop a redo log group?

You can drop a redo log group only if it is inactive. If you need to drop the current group, first force a log switch to occur. Make sure a redo log group is archived (if archiving is enabled) before dropping it. To see whether this has happened, use the V$LOG view.

Additionally, how do I move the redo log in Oracle 12c ASM? SQL> alter system set db_create_file_dest='+DATA' scope=spfile; Change also default location of online redo log files as +RECO disk group. SQL> alter system set db_create_online_log_dest_1='+RECO' scope=spfile; 3- Reset control_files parameter in the spfile parameter file.

In respect to this, how do I drop and recreate redo logs in standby database?

On Standby Server:

Cancel the Redo log apply service running.
Change the STANDBY_FILE_MANAGEMENT to MANUAL from AUTO in Standby Server.
Add or Drop the Redo log file in Standby:
Change the STANDBY_FILE_MANAGEMENT parameter value to AUTO.
Start the applied log service on standby.

How do I know the size of my redo log?

By monitoring the date and time of the online redo logs at the operating system level (or querying V$LOG_HISTORY), you can determine whether to increase the size or number of online redo logs to reach an optimum switching interval.

How do I resize a redo log?

How to resize redolog file in oracle

Step 1 : Check the Status of Redo Logfile. SQL> select group#,sequence#,bytes,archived,status from v$log;
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.

Can we delete redo log files?

You can clear an inactive redo log group when the database is open or closed. The procedure depends on whether the damaged group has been archived.

How do I make a redo log inactive?

Sql> select * from v$log; When a log switch occurs, the log writer (lgwr) process stops writing to the current redo log group and starts writing to the next available redo log group. You can force a log switch to make the current redo group inactive and available for redo log maintenance operations.

How do I change logfile?

ALTER SYSTEM SWITCH LOGFILE vsALTER SYSTEM ARCHIVE LOG CURRENT

It issues database checkpoint.
It immediately starts writing to the next redo log.
In the background, the "switch logfile" command tells the ARCH background process to copy the "old" redo log file to the redo log filesystem.

How do I create a new redo log group?

Adding a New Redo Logfile Group

SQL>alter database add logfile group 3 '/u01/oracle/ica/log3. ora' size 10M; Note: You can add groups to a database up to the MAXLOGFILES setting you have specified at the time of creating the database. If you want to change MAXLOGFILE setting you have to create a new controlfile.

How do I restore a redo log in Oracle?

Step-By-Step Guide

Run the following code to check to see what log is currently in use. set lines 180.
Make a note of the current log file group.
Drop and recreate logfile group 1.
Repeat the process for logfile group 2 and 3.
Switch log file group to free up log file group 4.
Drop and recreate logfile group 4.

What is redo log groups Oracle?

The most crucial structure for recovery operations is the redo log, which consists of two or more preallocated files that store all changes made to the database as they occur. Every instance of an Oracle Database has an associated redo log to protect the database in case of an instance failure.

Why do we create standby redo logs?

If you configure your standby for Maximum Protection, then Standby Redo Logs are required. Because a standby database exists, a second Archiver process (ARC1) will read from a completed Archived Redo Log and transmit the redo over the network to the Remote File Server (RFS) process running for the standby instance.

How do I drop and recreate redo logs in Oracle RAC?

Steps to drop redo log groups

To drop inactive / unused redo log group, SQL> Alter database drop logfile group 1; Database altered. Check again to verify the redo log groups.

How do I drop standby database?

ALTER DATABASE RECOVER MANAGED STANDBY DATABASE Enable Cluster & Start another nodeYou just have to add an standby instance. (meaning convert the single instance to RAC). Shutdown primary & Switchover Start old primary as standbyThat should the high level list of steps.

How do I drop the active standby redo log group?

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.

How do you add a redo log to a standby database?

Adding and Dropping Redo Logfiles in Physical Standby Database

Check the member present in standby database.
Cancel the recovery Process.
Check the standby_file_management parameter and set the parameter to MANUAL.
Add Redo Logfiles in Standby Database.
Check the Redo Logfiles.
Check the standby_file_management parameter and set the parameter to AUTO.

How do I add a standby logfile group to ASM?

If you want to use real-time apply Oracle Data Guard, you have to add standby logfile to standby database.

Show Logfiles Before Add. SQL> select * from gv$logfile;
Add Standby Logfile ASM.
Add Standby Logfile FileSystem.
Show Logfiles After Add.
Alter Data Guard To Real-Time Apply.
Drop Logfile.

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