一、更改Oracle為歸檔模式
1.關閉oracle
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
2.啟動為mount狀態
SQL> startup mount
ORACLE instance started.
Total System Global Area 2572144640 bytes
Fixed Size 2283984 bytes
Variable Size 738199088 bytes
Database Buffers 1828716544 bytes
Redo Buffers 2945024 bytes
Database mounted.
3.更改為歸檔模式
SQL> alter database archivelog
Database altered.
備注：‘archivelog’為 歸檔模式；‘noarchivelog’為非歸檔模式。
4.更改數據庫為‘打開’狀態
SQL> alter database open
5.查看歸檔模式信息
SQL> archvie log list
它會提示歸檔的模式、是否啟用、參數
Database log mode Archive Mode
Automatic archival Enabled
Archive destination USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence 88
Next log sequence to archive 90
Current log sequence 90
二、更改歸檔目錄
1.查看參數db_recovery_file_dest
（1）“db_recovery_file_dest”是用於定義存儲歸檔日志的目錄。通過show parameter命令，顯示參數的值為（默認為）fast_recovery_area。示例如下：
SQL> show parameter db_recovery
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
db_recovery_file_dest string D:\oracle\fast_recovery_area
db_recovery_file_dest_size big integer 4182M
（2）查看v$recovery_file_dest視圖，可得知fast_recovery_area的空間限制、已使用的空間、文件數等。
SQL> select * from v$recovery_file_dest;
NAME SPACE_LIMIT SPACE_USED SPACE_RECLAIMABLE NUMBER_OF_FILES
----------- ---------- ----------------- ---------------
D:\oracle\fast_recovery_area 4385144832 4346230272 2741248 102
2.更改歸檔日志目錄
語法：alter system set 參數=值 scope=spfile;
示例：SQL> alter system set db_recovery_file_dest='D:\oracle\archivelog' scope=spfile;
System altered.
三、更改歸檔日志大小
1.查看參數'db_recovery_file_dest_size'值
SQL> show parameter db_recov
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
db_recovery_file_dest string D:\oracle\archivelog
db_recovery_file_dest_size big integer 4182M
2.更改參數'db_recovery_file_dest_size'值大小
SQL> alter system set db_recovery_file_dest_size=41820M scope=spfile;
System altered.
3.關閉數據庫，重啟數據庫
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup open;
ORACLE instance started.
Total System Global Area 2572144640 bytes
Fixed Size 2283984 bytes
Variable Size 738199088 bytes
Database Buffers 1828716544 bytes
Redo Buffers 2945024 bytes
Database mounted.
Database opened.
4.再次查看參數'db_recovery_file_dest_size'值
SQL> show parameter db_reco
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
db_recovery_file_dest string D:\oracle\archivelog
db_recovery_file_dest_size big integer 41820M