【数据库管理】Oracle 11g归档模式&非归档模式

1 查看数据库归档模式

--通过命令查看
SQL> archive log list;
Database log mode	       No Archive Mode
Automatic archival	       Disabled
Archive destination	       USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence     1
Current log sequence	       1
--通过SQL查看
SQL> select name ,log_mode from v$database;

NAME	  LOG_MODE
--------- ------------
ORCL	  NOARCHIVELOG

2 切换非归档模式至归档模式

--关闭数据库
SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
--装载数据库
SQL> startup mount  
ORACLE instance started.

Total System Global Area  835104768 bytes
Fixed Size		    2257840 bytes
Variable Size		  520096848 bytes
Database Buffers	  310378496 bytes
Redo Buffers		    2371584 bytes
Database mounted.
--切换归档
SQL> alter database archivelog;

Database altered.
--打开数据库
SQL> alter database open;

Database altered.
--查看归档日志
SQL> select name from v$archived_log;

NAME
--------------------------------------------------------------------------------
/u01/app/oracle/fast_recovery_area/ORCL/archivelog/2018_04_30/o1_mf_1_1_fgfp8m8t_.arc
/u01/app/oracle/fast_recovery_area/ORCL/archivelog/2018_04_30/o1_mf_1_2_fgfp8mk9_.arc
--归档日志
SQL>  alter system archive log current;

System altered.

SQL> /

System altered.

SQL> select name from v$archived_log;

NAME
--------------------------------------------------------------------------------
/u01/app/oracle/fast_recovery_area/ORCL/archivelog/2018_04_30/o1_mf_1_1_fgfp8m8t_.arc
/u01/app/oracle/fast_recovery_area/ORCL/archivelog/2018_04_30/o1_mf_1_2_fgfp8mk9_.arc
/u01/app/oracle/fast_recovery_area/ORCL/archivelog/2018_04_30/o1_mf_1_1_fgfqc2wg_.arc
/u01/app/oracle/fast_recovery_area/ORCL/archivelog/2018_04_30/o1_mf_1_2_fgfqc4qy_.arc
SQL> 

alter system switch logfile:对单实例数据库或RAC中的当前实例进行日志切换；

alter system archive log current:会对数据库中的所有实例进行日志切换。