How do I move the redo log in Oracle 11g?

You can use operating system commands to relocate redo logs, then use the ALTER DATABASE statement to make their new names (locations) known to the database….

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 fix a log switch in Oracle?

Fix frequent log switches

Increase the size of the online redo logs. In this example, a redo log switch every 10 minutes should be doubled, and change the redo log file size from 1 gigabytes to two gigabytes.
Increase the number of redo log groups.
Change the updates to run in NOLOGGING.

What is redo log switch in Oracle?

A log switch is the point at which the database stops writing to one redo log file and begins writing to another. Normally, a log switch occurs when the current redo log file is completely filled and writing must continue to the next redo log file.

Where is Oracle redo log file location?

The archived redo log destination is D:\oracle\oradata\IDDB2\archive. The oldest filled redo log group has a sequence number of 11160. The next filled redo log group to archive has a sequence number of 11163. The current redo log file has a sequence number of 11163.

How do I move a redo log?

How to relocate the redo log files to a different location on…

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

How do I change the redo log size in Oracle 11g?

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 11g?

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 purpose of redo log files?

Redo log files are operating system files used by Oracle to maintain logs of all transactions performed against the database. The primary purpose of these log files is to allow Oracle to recover changes made to the database in the case of a failure.

What is the difference between redo and undo in Oracle?

UNDO is used to rollback transactions. REDO records changes to the original data, and is important for transactions that are not committed at the time of a crash or failure. REDO is used to roll forward transactions.

How do I view a redo log file?

The V$LOGFILE view can be used to find the datafiles for the redo logs. SVRMGR> select * from V$LOGFILE; GROUP# STATUS MEMBER —— —— —————————— 1 /t01/oradata/MYDB/redo.

How many redo log switches per hour in Oracle?

There should not be frequent log switches per hour. Ideally redo log switch frequency should be 4-5 log switches per hour. If there is frequent log switches then check the size of redo logs and increase accordingly. V$LOG_HISTORY is used to check history of redo log generation in Oracle.

How is 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).

When does the redo log switch take place?

The information of Redo Logs in the database can be found as follows; The log switch operation takes place when Online Redo Logs are full. If you increase redo log size your log switch frequenct will be reduced. But you may want to perform the Log switch operation periodically.

When to add or delete a redo log?

For example; if a very high IMPORT or DELETE operation is to be performed and the database FORCE LOGGING cannot be disabled, then it makes sense to add a new ONLINE REDO LOG as much as the size of the data to be IMPORTED, and then delete this ONLINE REDO LOG after the operation is finished.

How do I move the redo log in Oracle 11g?