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How do I archive a redo log?
To archive a filled redo log group manually, connect with administrator privileges. Ensure that the database is mounted but not open. Use the ALTER SYSTEM statement with the ARCHIVE LOG clause to manually archive filled redo log files.
How do I enable archive log?
Enabling ARCHIVELOG mode
- Log in as user oracle and enter the following commands: $ export ORACLE_SID=
- To enable ARCHIVELOG mode status, enter the following SQL commands: SQL> Shutdown SQL> Startup mount SQL> Alter database archivelog; SQL> alter database open;
What is active redo log?
The redo log file that LGWR is actively writing to is called the current redo log file. Redo log files that are required for instance recovery are called active redo log files. Redo log files that are no longer required for instance recovery are called inactive redo log files.
How do I enable archive log mode in RAC?
Follow below steps for enabling archive log mode in oracle RAC.
- stop the database service. srvctl stop database -d DBACLASS.
- start the database in mount state. srvctl start database -d DBACLASS -o mount.
- enable archive log mode.
- Restart the database service (using srvctl)
- set the archive destination to a ASM DISK.
What is enable archiving?
When an archive mailbox is enabled, users can store messages in their archive mailbox. Users can access their archive mailboxes by using Microsoft Outlook and Outlook on the web. For example, you can use your organization’s Exchange retention policy to move mailbox content to users’ archive mailbox.
How are redo log files turned into archived files?
The process of turning redo log files into archived redo log files is called archiving. This process is only possible if the database is running in ARCHIVELOG mode. You can choose automatic or manual archiving. An archived redo log file is a copy of one of the filled members of a redo log group.
What happens if a redo log file is corrupted?
A redo log file might become corrupted while the database is open, and ultimately stop database activity because archiving cannot continue. In this situation the ALTER DATABASE CLEAR LOGFILE statement can be used to reinitialize the file without shutting down the database. Example:
How many redo log files do I need for Oracle?
If the database is in archivelog mode, there should be at least 2 redo log files for each database. One is required for the current use and the other for the archive log. You must change the size of the redo log file and the number of redo log files in the default installation according to your system needs.
What happens when you run a database in archivelog mode?
When you run a database in ARCHIVELOG mode, you enable the archiving of the redo log. The database control file indicates that a group of filled redo log files cannot be reused by LGWR until the group is archived.