把 Oracle 数据库从 Windows 系统迁移到 Linux Oracle Rac 集群环境（3）—— 把数据库设置为归档模式

一、查看数据库是否为归档模式

-- 节点1：非归档模式
SQL> archive log list;
Database log mode	       No Archive Mode
Automatic archival	       Disabled
Archive destination	       USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence     15
Current log sequence	       17

-- 节点2：非归档模式
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	       2

二、打开归档模式

在 oracle rac 集群环境下，要设置一个节点为归档模式或非归档模式，必须关闭其他节点。

1、设置节点 rac1 为归档模式

（1）关闭节点2的实例

SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.

2、在节点 rac1 上执行如下操作

（1）正常停库，然后启动数据库到 mount 状态

-- 关闭实例
SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.

-- 启动数据库到 mount 状态
SQL> startup mount
ORACLE instance started.

Total System Global Area  638853120 bytes
Fixed Size		    2255952 bytes
Variable Size		  507511728 bytes
Database Buffers	  121634816 bytes
Redo Buffers		    7450624 bytes
Database mounted.

（2）使用 alter database 命令打开归档模式

SQL> alter database archivelog;

Database altered.

（3）关闭节点1的实例

SQL> shutdown immediate
ORA-01109: database not open

Database dismounted.
ORACLE instance shut down.

3、在节点 rac2 上执行如下操作

（1）然后启动数据库到 mount 状态

-- 节点 rac2 处于关闭状态
-- 启动数据库到 mount 状态
SQL> startup mount
ORACLE instance started.

Total System Global Area  638853120 bytes
Fixed Size		    2255952 bytes
Variable Size		  465568688 bytes
Database Buffers	  163577856 bytes
Redo Buffers		    7450624 bytes
Database mounted.

（2）使用 alter database 命令打开归档模式

SQL> alter database archivelog;

Database altered.

（3）关闭节点1的实例归档模式

SQL> alter database archivelog;

Database altered.

4、打开数据库，查看归档状态

-- 节点1
SQL> startup
ORACLE instance started.

Total System Global Area  638853120 bytes
Fixed Size		    2255952 bytes
Variable Size		  507511728 bytes
Database Buffers	  121634816 bytes
Redo Buffers		    7450624 bytes
Database mounted.
Database opened.

-- 查看归档状态
SQL> archive log list;
Database log mode	       Archive Mode
Automatic archival	       Enabled
Archive destination	       USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence     1
Next log sequence to archive   2
Current log sequence	       2

-- 节点2
SQL> alter database open;

Database altered.

-- 查看归档状态
SQL> archive log list;
Database log mode	       Archive Mode
Automatic archival	       Enabled
Archive destination	       USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence     15
Next log sequence to archive   17
Current log sequence	       17

三、设置归档的位置

当数据库处于归档模式时，进行日志切换时后台进程将自动生成归档日志。

1、查看归档进程数

SQL> show parameter LOG_ARCHIVE_MAX_PROCESSES

NAME				     TYPE	 VALUE
------------------------------------ ----------- ------------------------------
log_archive_max_processes	     integer	 4

2、查看归档文件

可知当前归档位置为：/u01/app/oracle/flash_recovery_area/HISDB/archivelog

SQL> select sequence#, name from v$archived_log;

 SEQUENCE# NAME
--------------------------------------------------------------------------------
	17
/u01/app/oracle/flash_recovery_area/HISDB/archivelog/2022_06_17/o1_mf_1_17_kbr52
8s8_.arc

	18
/u01/app/oracle/flash_recovery_area/HISDB/archivelog/2022_06_17/o1_mf_1_18_kbr52
d2g_.arc

	19
/u01/app/oracle/flash_recovery_area/HISDB/archivelog/2022_06_17/o1_mf_1_19_kbr52
g87_.arc

	 2
/u01/app/oracle/flash_recovery_area/HISDB/archivelog/2022_06_17/o1_mf_2_2_kbr52d
rp_.arc

	20
/u01/app/oracle/flash_recovery_area/HISDB/archivelog/2022_06_17/o1_mf_1_20_kbr52
hdo_.arc

3、修改归档日志的位置为：+BAK/hisdb/archivelog

修改 log_archive_dest_1 参数指向定义的归档位置：

SQL> alter system set log_archive_dest_1 = 'location=+BAK' scope = both sid='*';

System altered.

-- 对比log_archive_dest 和log_archive_dest_1 设置归档的区别 
-- alter system set log_archive_dest='+DATA' 
-- alter system set log_archive_dest_1='location=+DATA' 

4、查看归档文件

-- 切日志
SQL> alter system switch logfile;

System altered.

SQL> alter system switch logfile;

System altered.

SQL> alter system switch logfile;

System altered.

SQL> select sequence#, name from v$archived_log;

 SEQUENCE# NAME
--------------------------------------------------------------------------------
	17
/u01/app/oracle/flash_recovery_area/HISDB/archivelog/2022_06_17/o1_mf_1_17_kbr52
8s8_.arc

	18
/u01/app/oracle/flash_recovery_area/HISDB/archivelog/2022_06_17/o1_mf_1_18_kbr52
d2g_.arc

	19
/u01/app/oracle/flash_recovery_area/HISDB/archivelog/2022_06_17/o1_mf_1_19_kbr52
g87_.arc

	 2
/u01/app/oracle/flash_recovery_area/HISDB/archivelog/2022_06_17/o1_mf_2_2_kbr52d
rp_.arc

	20
/u01/app/oracle/flash_recovery_area/HISDB/archivelog/2022_06_17/o1_mf_1_20_kbr52
hdo_.arc

	21
+BAK/hisdb/archivelog/2022_06_17/thread_1_seq_21.262.1107612429

	22
+BAK/hisdb/archivelog/2022_06_17/thread_1_seq_22.263.1107612429

	23
+BAK/hisdb/archivelog/2022_06_17/thread_1_seq_23.264.1107612429

	24
+BAK/hisdb/archivelog/2022_06_17/thread_1_seq_24.265.1107612453

	25
+BAK/hisdb/archivelog/2022_06_17/thread_1_seq_25.266.1107612453

		26
+BAK/hisdb/archivelog/2022_06_17/thread_1_seq_26.267.1107612457

	 3
+BAK/hisdb/archivelog/2022_06_17/thread_2_seq_3.268.1107612601

	 4
+BAK/hisdb/archivelog/2022_06_17/thread_2_seq_4.269.1107612605

	 5
+BAK/hisdb/archivelog/2022_06_17/thread_2_seq_5.270.1107612607


14 rows selected.