-查看實例進程看是否有歸檔的進程
[[email protected] ~]$ ps -ef | grep PROD4

SQL> archive log list;
Database log mode       No Archive Mode
Automatic archival       Disabled
Archive destination      /u01/app/oracle/product/11.2.0/db_1/dbs/archOldest online log sequence     6
Current log sequence       8

sql> show parameter log_archive

--在mount狀態下做
--關閉數據庫
SQL> shutdown immediate        ---必須是immediate 一至性關閉數據庫
SQL> startup mount

SQL> alter system set log_archive_dest_1=‘location=/home/oracle/arch‘;  ---目錄提前創建好

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       /home/oracle/arch
Oldest online log sequence     6
Next log sequence to archive   8
Current log sequence       8

--生成歸檔（需要切redo日誌）
QL> select group#,member from v$logfile;
    GROUP#
----------
MEMBER
-----------------------------------------------------------------------------
 3
/u01/app/oracle/oradata/PROD4/PROD4/redo03.log
 2
/u01/app/oracle/oradata/PROD4/PROD4/redo02.log
 1
/u01/app/oracle/oradata/PROD4/PROD4/redo01.log

SQL> select group#,status from v$log;
    GROUP# STATUS
---------- ----------------
 1 INACTIVE
 2 CURRENT
 3 INACTIVE

 --切redo
SQL> alter system switch logfile;
System altered.

SQL> select group#,status from v$log;
   GROUP# STATUS
---------- ----------------
 1 INACTIVE
 2 INACTIVE
 3 CURRENT
--三種狀態  current ：當前用的
            active   ：正在歸檔時的狀態，
            inactive：歸檔完畢，不用的狀態

 --查看歸檔目錄下生成的歸檔文件
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