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How to Enable Archive Log Mode in Oracle Database


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How to Enable Archive Log Mode in Oracle Database

Check if the Archivelog mode is enabled

SQL> archive log list;
Database log mode              No Archive Mode
Automatic archival             Disabled
Archive destination            ?#/dbs/arch
Oldest online log sequence     4146
Current log sequence           4148
SQL> select log_mode from v$database;
LOG_MODE
------------
NOARCHIVELOG

Enable Archive log mode using Flash Recovery Area

How to Enable Flash Recovery Area

To enable Flash Recovery Area you need to set db_recovery_file_dest_size and db_recovery_file_dest parameter.
SQL> show parameter db_recovery_file_dest
NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
db_recovery_file_dest                string
db_recovery_file_dest_size           big integer 0
SQL> alter system set db_recovery_file_dest_size=50G scope=both;
System altered.
SQL> alter system set db_recovery_file_dest='+DG_TST_FRA' scope=both;
System altered.
SQL> show parameter db_recovery_file
NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
db_recovery_file_dest                string      +DG_TST_FRA
db_recovery_file_dest_size           big integer 50G
SQL> archive log list;
Database log mode              No Archive Mode
Automatic archival             Disabled
Archive destination            USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence     4146
Current log sequence           4148
NOTE:As soon as you enable the FRA the archiving location is implicitly set to FRA even if the Archivelog mode is not enabled
Put the database in mount mode and enable the achivelog mode
SQL> shut immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup mount;
ORACLE instance started.
Total System Global Area 2147483648 bytes
Fixed Size                  8794848 bytes
Variable Size            1912605984 bytes
Database Buffers          218103808 bytes
Redo Buffers                7979008 bytes
Database mounted.
SQL> alter database archivelog;
Database altered.
SQL> alter database open;
Database altered.
SQL> archive log list;
Database log mode              Archive Mode
Automatic archival             Enabled
Archive destination            USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence     4146
Next log sequence to archive   4148
Current log sequence           4148
If you don't want to use FRA you can instruct oracle to write the logs on some other location by setting log_archive_dest_ parameter.
SQL> alter system set log_archive_dest_1='location=/u01/dbatst1/stage/archive/';
System altered.
SQL> show parameter log_archive_dest_1
NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
log_archive_dest_1                   string      location=/u01/dbatst1/stage/ar
                                                 chive/
SQL> archive log list;
Database log mode              Archive Mode
Automatic archival             Enabled
Archive destination            /u01/dbatst1/stage/archive/
Oldest online log sequence     4147
Next log sequence to archive   4149
Current log sequence           4149

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