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oracle 11g switchover

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Release： 2016-06-07 16:36:38

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oracle dataguard搭建请看如下链接 http://www.itopers.com/?p=679 switchover主要是在数据库升级，硬件升级等进行。如下将如何进行switchover：在prmary将数据库设置为standby SQL alter database commit to switchover to physical standby;Database alte

oracle dataguard搭建请看如下链接

http://www.itopers.com/?p=679

switchover主要是在数据库升级，硬件升级等进行。如下将如何进行switchover：

在prmary将数据库设置为standby

SQL> alter database commit to switchover to physical standby;
Database altered.

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11g时，执行这个命令后，数据库已经关闭了，不需要手动进行关闭了

SQL> select db_unique_name,database_role,open_mode,switchover_status from v$database;
select db_unique_name,database_role,open_mode,switchover_status from v$database
*
ERROR at line 1:
ORA-01034: ORACLE not available
Process ID: 2650
Session ID: 458 Serial number: 211

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然后启动启动到mount状态查看：

SQL> startup mount
ORACLE instance started.
Total System Global Area 1.3462E+10 bytes
Fixed Size                  2265984 bytes
Variable Size            3321891968 bytes
Database Buffers         1.0133E+10 bytes
Redo Buffers                4460544 bytes
Database mounted.
SQL> select db_unique_name,database_role,open_mode,switchover_status from v$database;
DB_UNIQUE_NAME                 DATABASE_ROLE    OPEN_MODE
------------------------------ ---------------- --------------------
SWITCHOVER_STATUS
--------------------
actvdb01                       PHYSICAL STANDBY MOUNTED
RECOVERY NEEDED

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查看已经是PHYSICAL STANDBY状态了。

打开数据库，这个时候应该是read only状态：

SQL> alter database open;
Database altered.
SQL> select db_unique_name,database_role,open_mode,switchover_status from v$database;
DB_UNIQUE_NAME                 DATABASE_ROLE    OPEN_MODE
------------------------------ ---------------- --------------------
SWITCHOVER_STATUS
--------------------
actvdb01                       PHYSICAL STANDBY READ ONLY
RECOVERY NEEDED

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这个时候primary已经变成了standby了。

然后连接到之前的standby服务器上：

先查看状态，确定日志应用是否完整

SQL> select db_unique_name,database_role,open_mode from v$database;
DB_UNIQUE_NAME                 DATABASE_ROLE    OPEN_MODE
------------------------------ ---------------- --------------------
actvdb02                       PHYSICAL STANDBY READ ONLY WITH APPLY
SQL> archive log list
Database log mode              Archive Mode
Automatic archival             Enabled
Archive destination            USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence     348
Next log sequence to archive   0
Current log sequence           353
SQL> alter database recover managed standby database cancel;
Database altered.
SQL> select db_unique_name,database_role,open_mode from v$database;
DB_UNIQUE_NAME                 DATABASE_ROLE    OPEN_MODE
------------------------------ ---------------- --------------------
actvdb02                       PHYSICAL STANDBY READ ONLY

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然后将standby切换成primary

SQL>  alter database commit to switchover to primary;
Database altered.
SQL> select db_unique_name,database_role,open_mode from v$database;
DB_UNIQUE_NAME                 DATABASE_ROLE    OPEN_MODE
------------------------------ ---------------- --------------------
actvdb02                       PRIMARY          MOUNTED

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完成后，状态已经变成的primary了，注意，在执行切换过程中，不能有任何session连接，如果有会有如下报错：

SQL> alter database commit to switchover to primary;
alter database commit to switchover to primary
*
ERROR at line 1:
ORA-01093: ALTER DATABASE CLOSE only permitted with no sessions connected

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把session关闭掉，重新执行即可。

然后打开数据库,在新primary中（也就是老的standby）

SQL> alter database open;
Database altered.
SQL> select db_unique_name,database_role,open_mode from v$database;
DB_UNIQUE_NAME                 DATABASE_ROLE    OPEN_MODE
------------------------------ ---------------- --------------------
actvdb02                       PRIMARY          READ WRITE
SQL> select db_unique_name,database_role,open_mode,switchover_status from v$database;
DB_UNIQUE_NAME                 DATABASE_ROLE    OPEN_MODE
------------------------------ ---------------- --------------------
SWITCHOVER_STATUS
--------------------
actvdb02                       PRIMARY          READ WRITE
TO STANDBY

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查看状态已经变成了primary,且为read write了。表示已经成功从standby转成primary了

然后再登录到standby中（之前的primary中）启用mrp进程

SQL> alter database recover managed standby database using current logfile disconnect from session;
Database altered.
SQL> select db_unique_name,database_role,open_mode,switchover_status from v$database;
DB_UNIQUE_NAME                 DATABASE_ROLE    OPEN_MODE
------------------------------ ---------------- --------------------
SWITCHOVER_STATUS
--------------------
actvdb01                       PHYSICAL STANDBY READ ONLY WITH APPLY
NOT ALLOWED

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再查看进程已经是应用日志状态了。

到新的primary中将创建表测试是否能正常应用日志：

SQL> create table test.t11 (id number)tablespace test;
Table created.

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到standby中查看已经能正常传输、应用日志了：

SQL> select owner,table_name from dba_tables where owner='TEST';
OWNER                          TABLE_NAME
------------------------------ ------------------------------
TEST                           T2
TEST                           TEST_TABLE
TEST                           TEST01
TEST                           TEST02
TEST                           TEST03
TEST                           T4
TEST                           T5
TEST                           T7
TEST                           T6
TEST                           T8
TEST                           T11
OWNER                          TABLE_NAME
------------------------------ ------------------------------
TEST                           T9
12 rows selected.

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只要前面的配置没有问题，switchover是很简单的，特别注意以下几点：

*.local_listener 这个配置是的自己的tnsname名字

*.fal_client=’actvdb’??? 这个配置的是自己的tnsname,不管是primary，还是standby
*.fal_server=’actvdbbak’?? 这个配置的是对方的tnsname,不管是primary，还是standby

原文地址：oracle 11g switchover, 感谢原作者分享。