oracle 单实例DG(切换篇)

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;

oracle 单实例DG(切换篇)

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 open 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;

       oracle 单实例DG(切换篇)

    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#;
 
oracle 单实例DG(切换篇)
 1 SQL> select sequence#, applied from v$archived_log where applied='YES'order by sequence#;
 2 
 3  SEQUENCE# APPLIED
 4 ---------- ---------
 5      6 YES
 6      6 YES
 7      7 YES
 8      7 YES
 9      8 YES
10      8 YES
11      9 YES
12      9 YES
13     10 YES
14     10 YES
15     11 YES
16 
17  SEQUENCE# APPLIED
18 ---------- ---------
19     11 YES
20     12 YES
21     12 YES
22     13 YES
23     13 YES
24     14 YES
25     14 YES
26     15 YES
27     15 YES
28     16 YES
29     16 YES
30 
31  SEQUENCE# APPLIED
32 ---------- ---------
33     17 YES
34     17 YES
35     18 YES
36     19 YES
37     20 YES
38     21 YES
39 
40 28 rows selected.
View Code

  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:

    oracle 单实例DG(切换篇)

    

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$archived_log where applied='YES' order by sequence#;
oracle 单实例DG(切换篇)
 1 SQL> select sequence#, applied from v$archived_log where applied='YES' order by sequence#;
 2 
 3  SEQUENCE# APPLIED
 4 ---------- ---------
 5      6 YES
 6      6 YES
 7      7 YES
 8      7 YES
 9      8 YES
10      8 YES
11      9 YES
12      9 YES
13     10 YES
14     10 YES
15     11 YES
16 
17  SEQUENCE# APPLIED
18 ---------- ---------
19     11 YES
20     12 YES
21     12 YES
22     13 YES
23     13 YES
24     14 YES
25     14 YES
26     15 YES
27     15 YES
28     16 YES
29     16 YES
30 
31  SEQUENCE# APPLIED
32 ---------- ---------
33     17 YES
34     17 YES
35     18 YES
36     19 YES
37     20 YES
38     21 YES
39     22 YES
40 
41 29 rows selected.
42 
43 SQL>
View Code
select switchover_status from v$database;
alter database commit to switchover to primary;
select status from v$instance;

 

    

 

      

   

       

上一篇:抑制字符串处理为可迭代


下一篇:for of