SQL>alter system set log_archive_dest=’+LWK/archivelog’ scope=spfile sid=’*';
然後關閉兩個實例，啓動實例，更改數據庫爲歸檔模式：
SQL>shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL>startup mount;
ORACLE instance started.
Total System Global Area 1258291200 bytes
Fixed Size 1978336 bytes
Variable Size 352325664 bytes
Database Buffers 889192448 bytes
Redo Buffers 14794752 bytes
Database mounted.
SQL>alter database archivelog;
Database altered.
SQL>alter database open;
SQL>archive log list;
Database log mode Archive Mode
Automatic archival Enabled
Archive destination /opt/oracle/archive
Oldest online log sequence 83
Next log sequence to archive 84
Current log sequence 84
接下來啓動另外一個節點，完成歸檔模式的變更過程。
在 RAC環境下，歸檔路徑的選擇是值得斟酌的，如果使用共享的歸檔目錄作爲歸檔路徑，則可以減少備份時的複雜性。如果使用獨立的目錄，則備份時需要進行特殊處理。