How do I rename a redo log?

How do I rename a redo log?

To rename redo log members, you must have the ALTER DATABASE system privilege….

1. Shut down the database.
2. Copy the redo log files to the new location.
3. Startup the database, mount, but do not open it.
4. Rename the redo log members.

How do I rename a redo log in Oracle 11g ASM?

To move or rename a logfile do the following.

1. Shutdown the database.
2. Rename the physical file on the OS.
3. Start the database in mount mode.
4. Issue the ALTER DATABASE RENAME FILE command to rename the file within the Oracle dictionary.
5. Open the database.

How do you rename redo log file online or offline?

Offline Method

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

How do I change the redo log in Oracle?

A log switch occurs when LGWR stops writing to one redo log group and starts writing to another. By default, a log switch occurs automatically when the current redo log file group fills. You can force a log switch to make the currently active group inactive and available for redo log maintenance operations.

How do I drop a redo log in Oracle 11g?

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 change the control file location in Oracle 11g?

Here are the steps to change the location of control file for a single-instance database by RMAN:

1. Check Current Control Files.
2. Backup SPFILE.
3. Change Location of Control Files.
4. Restart to NOMOUNT.
5. Restore Control Files.
6. Open Database.
7. Check Current Control Files Again.

How do I rename a file in datafile?

To rename datafiles in a single tablespace, complete the following steps:

1. Take the tablespace that contains the datafiles offline.
2. Rename the datafiles using the operating system.
3. Use the ALTER TABLESPACE statement with the RENAME DATAFILE clause to change the filenames within the database.
4. Back up the database.

How do I change the log file?

ALTER SYSTEM SWITCH LOGFILE vs ALTER SYSTEM ARCHIVE LOG CURRENT

1. It issues database checkpoint.
2. It immediately starts writing to the next redo log.
3. 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 recreate a redo log?

Step-By-Step Guide

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

How do I create a new redo log group in Oracle 11g?

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.

What is the difference between checkpoint and SCN?

So in short, Checkpoint is the concept/background process while SCN is like serial number in our table.. the system change number (SCN) is Oracle’s clock – every time we commit, the clock increments. The SCN just marks a consistent point in time in the database.

How do I rename a redo log file?

Rename the redo log members. Use the ALTER DATABASE statement with the RENAME FILE clause to rename the database redo log files. ALTER DATABASE RENAME FILE ‘/diska/logs/log1a.rdo’, ‘/diska/logs/log2a.rdo’ TO ‘/diskc/logs/log1c.rdo’, ‘/diskc/logs/log2c.rdo’; Open the database for normal operation.

How Oracle database writes to the redo log?

How Oracle Database Writes to the Redo Log. The redo log of a database consists of two or more redo log files. The database requires a minimum of two files to guarantee that one is always available for writing while the other is being archived (if the database is in ARCHIVELOG mode).

How do I move or rename a logfile in Oracle?

To move or rename a logfile do the following. Shutdown the database. Rename the physical file on the OS. Start the database in mount mode. Issue the ALTER DATABASE RENAME FILE command to rename the file within the Oracle dictionary. Open the database. The following SQL*Plus output shows how this is done. SQL> SHUTDOWN IMMEDIATE Database closed.

What happens when a redo log group is dropped from database?

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. Rather, the control files of the associated database are updated to drop the members of the group from the database structure.