Oracle Archivelog Mode

Oracle Database lets you save filled groups of redo log files to one or more offline destinations, known collectively as the archived redo log, or more simply the archive log. 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 ARCHIVELOGmode.

By default, database runs in no archivelog mode. You must enable it to save the redolog files into different location.

Checking Archivelog Mode

Use below command to check the archivelog mode inside the oracle database

SQL> archive log list;

You can also use below command

SQL> SELECT LOG_MODE FROM SYS.V$DATABASE;

Set Archivelog Destination

You must set a destination for archivelog files

SQL> alter system set log_archive_dest_1='location=/u01/proddb/arch'

Enable Archivelog Mode

Please note that in order to enable archivelog mode, you must bounce the database

SQL> Shut immediate;
SQL> Startup mount;
SQL> alter database archivelog;
SQL> alter database open;
SQL> archive log list;

Disable Archivelog Mode

The database must bounced even when you want to disable archivelog mode

SQL> shut immediate;
SQL> startup mount;
SQL> alter database noarchivelog;
SQL> alter database open;
SQL> archive log list;

Performing Log Switch

While your database is running in archivelog mode, you can perform force log switch. This will archive the current redo log file and force LGWR to start over-writing other redo log member

SQL> alter system switch logfile;

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