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Archive logging

This is probably in a million places out there but just posting it here for my own reference and you might find it useful too.

Disable Archiving

SQL> archive log list;

Database log mode              Archive Mode
Automatic archival             Enabled
Archive destination            /u04/archive/ref4data
Oldest online log sequence     1
Next log sequence to archive   4
Current log sequence           4
SQL> shutdown immediate Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup mount ORACLE instance started. Total System Global Area 8551575552 bytes
Fixed Size                  2270360 bytes
Variable Size            2634025832 bytes
Database Buffers         5804916736 bytes
Redo Buffers              110362624 bytes
Database mounted.
SQL> alter database noarchivelog; Database altered. SQL> alter database open; Database altered. SQL> archive log list; Database log mode              No Archive Mode
Automatic archival             Disabled
Archive destination            /u04/archive/ref4data
Oldest online log sequence     1
Current log sequence           4

Enable Archiving

SQL> archive log list; Database log mode              No Archive Mode
Automatic archival             Disabled
Archive destination            /u04/archive/ref4data
Oldest online log sequence     1
Current log sequence           4
SQL> shutdown immediate Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup mount ORACLE instance started. Total System Global Area 8551575552 bytes
Fixed Size                  2270360 bytes
Variable Size            2634025832 bytes
Database Buffers         5804916736 bytes
Redo Buffers              110362624 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            /u04/archive/ref4data
Oldest online log sequence     1
Next log sequence to archive   4
Current log sequence           4

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