How do I create a redo log group in Oracle RAC?
To create a new group of redo log files, use the SQL statement ALTER DATABASE with the ADD LOGFILE clause. The following statement adds a new group of redo logs to the database: ALTER DATABASE ADD LOGFILE (‘/oracle/dbs/log1c.
How do I drop and recreate redo logs in Oracle RAC?
Dropping Online Redo Log Members To drop a member of an online redo log group use the following command: ALTER DATABASE DROP LOGFILE MEMBER ‘/DISK4/log2b. dbf’; Same statement holds good for OMF, find the logfile member full_path_file_name and drop the member.
How do you add a redo log to a group?
To create new redo log members for an existing group, use the SQL statement ALTER DATABASE with the ADD LOGFILE MEMBER clause. The following statement adds a new redo log member to redo log group number 2: ALTER DATABASE ADD LOGFILE MEMBER ‘/oracle/dbs/log2b.
How do you add a redo log group in ASM?
Create new Redo Log members for an existing group ALTER DATABASE ADD LOGFILE MEMBER ‘+REDO’ TO GROUP 1; Notice that filenames must be specified, but sizes need not be. The size of the new members is determined from the size of the existing members of the group.
How do I delete 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.
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.
How do I create a standby redo log?
The following steps show how to perform these tasks.
- Step 1 Identify the existing archived redo log files.
- Step 2 Force a log switch to archive the current online redo log file.
- Step 3 Verify the new redo data was archived on the standby database.
- Step 4 Verify new archived redo log files were applied.
How do I rename a redo log in Oracle?
To rename redo log members, you must have the ALTER DATABASE system privilege….
- Shut down the database.
- Copy the redo log files to the new location.
- Startup the database, mount, but do not open it.
- Rename the redo log members.
How do I drop a redo log group in Oracle RAC?
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.
How do I resize a redo log in Oracle 12c RAC?
How to Resizing Oracle Redo Log Groups in RAC. Resizing Oracle’s redo log groups is performed in 2 Steps. Step1> Add new the redo log groups with expected size. Step2> Drop the old redo log groups.
How do I recreate an online redo log in Oracle?
Intention is to drop and recreate these online logs with a different size. Begin dropping the redolog groups with STATUS=’INACTIVE’ – As mentioned earlier Oracle will not allow you to drop a current online redolog file. sql> alter system switch logfile; Run the command 2 or 3 times if the group status does not change.
How to create redo log groups in Oracle?
Creating Redo Log Groups To create a new group of redo log files, use the SQL statement ALTER DATABASE with the ADD LOGFILE clause. The following statement adds a new group of redo logs to the database: ALTER DATABASE ADD LOGFILE (‘/oracle/dbs/log1c.rdo’, ‘/oracle/dbs/log2c.rdo’) SIZE 100M;
What does it mean to multiplex redolog in RAC?
Multiplexing means to keep multiple copies of redo log in different diskgroup. It is similar to that of multiplexing in standalone, Only change is RAC will have threads for node. i.e a 2 node RAC will have 2 threads. So while adding redolog group, we need to mention the thread parameter.
What happens if I drop redo log group?
While dropping redo log group & we need to check the status of redo log groups. redo log group status should be INACTIVE or UNUSED. Database altered. Check again to verify the redo log groups. You are commenting using your WordPress.com account. ( Log Out / Change )