一,开篇

   此篇操作承接上文,必须完成DG实例搭建完成方可有执行以下内容的实例

二,切换物理备库

  one. oracle01库命令

select switchover_status from v$database;

alter database commit to switchover to physical standby;

注意:  上面 switchover_status 的值如果是 TO STANDBY,可以直接 switchover,如果是 sessions active,则需要在 switchover 的命 令后面加上 with session shutdown,比如 alter database commit to switchover to physical standby with session shutdown;

select status from v$instance;--检查状态

shutdown immediate

startup nomount

切换主库为备库

   two.standy端 

select sequence#, applied from v$archived_log where applied='YES' order by sequence#;
SQL> select sequence#, applied from v$archived_log where applied='YES' order by sequence#;

 SEQUENCE# APPLIED
---------- ---------
6 YES
7 YES
8 YES
9 YES
10 YES
11 YES
12 YES
13 YES
14 YES
15 YES
16 YES SEQUENCE# APPLIED
---------- ---------
17 YES
18 YES
19 YES 14 rows selected.
日志同步
SQL> select switchover_status from v$database;

SWITCHOVER_STATUS
--------------------
TO PRIMARY SQL> alter database commit to switchover to primary;

Database altered.
备库切成主库 SQL> select status from v$instance;

STATUS
------------
MOUNTED SQL> shutdown immediate
ORA-01109: database not o
pen Database dismounted.
ORACLE instance shut down.
SQL> startup
ORACLE instance started. Total System Global Area 2505338880 bytes
Fixed Size 2255832 bytes
Variable Size 603980840 bytes
Database Buffers 1879048192 bytes
Redo Buffers 20054016 bytes
Database mounted.
Database opened.
SQL>

  three.oracle01端

      创建备日志

alter database add standby logfile ('/u01/app/oracle/oradata/oracle01/standby01.log') size 50m;
alter database add standby logfile('/u01/app/oracle/oradata/oracle01/standby02.log') size 50m;
alter database add standby logfile('/u01/app/oracle/oradata/oracle01/standby03.log') size 50m;
alter database add standby logfile('/u01/app/oracle/oradata/oracle01/standby04.log') size 50m;

      

    执行同步语句:

alter database recover managed standby database using current logfile disconnect from session;
select sequence#, applied from v$archived_log where applied='YES'order by sequence#;
 
 SQL> select sequence#, applied from v$archived_log where applied='YES'order by sequence#;

  SEQUENCE# APPLIED
---------- ---------
6 YES
6 YES
7 YES
7 YES
8 YES
8 YES
9 YES
9 YES
10 YES
10 YES
11 YES SEQUENCE# APPLIED
---------- ---------
11 YES
12 YES
12 YES
13 YES
13 YES
14 YES
14 YES
15 YES
15 YES
16 YES
16 YES SEQUENCE# APPLIED
---------- ---------
17 YES
17 YES
18 YES
19 YES
20 YES
21 YES 28 rows selected.

  four.standby执行创建数据库字段   

SQL> insert into dg values(2);

1 row created.

SQL> commit ;
  
Commit complete.

  five.oracle01执行   

SQL> alter database recover managed standby database cancel;

Database altered.

SQL> alter database open;

Database altered.

SQL> select * from dg;

	ID
----------
1
2 SQL>

      切换成功

  状态查看:

    

    

三,再次切oracle01为主库,standby为备库

   one.oracle01端执行   

SQL> select open_mode from v$database;

OPEN_MODE
--------------------
READ ONLY SQL> alter database recover managed standby database using current logfile disconnect from session; Database altered. SQL> select open_mode from v$database; OPEN_MODE
--------------------
READ ONLY WITH APPLY

   two.standby端执行   

SQL> select switchover_status from v$database;

SWITCHOVER_STATUS
--------------------
TO STANDBY SQL> alter database commit to switchover to physical standby; Database altered. SQL> shutdown immediate
ORA-01012: not logged on
SQL> startup nomount
ORACLE instance started. Total System Global Area 2505338880 bytes
Fixed Size 2255832 bytes
Variable Size 603980840 bytes
Database Buffers 1879048192 bytes
Redo Buffers 20054016 bytes
SQL> alter database mount standby database; Database altered. SQL>

   three.oracle01端执行

select sequence#, applied from v$archived_log where applied='YES' order by sequence#;
 SQL> select sequence#, applied from v$archived_log where applied='YES' order by sequence#;

  SEQUENCE# APPLIED
---------- ---------
6 YES
6 YES
7 YES
7 YES
8 YES
8 YES
9 YES
9 YES
10 YES
10 YES
11 YES SEQUENCE# APPLIED
---------- ---------
11 YES
12 YES
12 YES
13 YES
13 YES
14 YES
14 YES
15 YES
15 YES
16 YES
16 YES SEQUENCE# APPLIED
---------- ---------
17 YES
17 YES
18 YES
19 YES
20 YES
21 YES
22 YES 29 rows selected. SQL>
select switchover_status from v$database;
alter database commit to switchover to primary;
select status from v$instance;
shutdown immediate
startup

   four.standy端执行   

alter database recover managed standby database using current logfile disconnect from session;

    five.oracle01端.添加数据测试 

SQL> insert into dg values(3);

1 row created.

SQL> commit;

Commit complete.

SQL> alter system switch logfile;

System altered.

   six.standby 数据查看

SQL>
alter database recover managed standby database using current logfile disconnect from session;SQL> Database altered. SQL> alter database recover managed standby database cancel; Database altered. SQL> alter database open; Database altered. SQL> select * from dg; ID
----------
1
2
3 SQL>
  

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