1.检查主备的环境
dg1节点:
sql> archive log list;
Database log mode Archive Mode
Automatic archival Enabled
Archive destination /u01/oradata/tong/archive
Oldest online log sequence 59
Next log sequence to archive 61
Current log sequence 61
sql>
dg2节点:
Oldest online log sequence 60
Next log sequence to archive 0
Current log sequence 61
2.查看主备的角色
dg1节点(primary角色):
sql> select switchover_status,database_role from v$database;
SWITCHOVER_STATUS DATABASE_ROLE
-------------------- ----------------
TO STANDBY PRIMARY
dg2节点(standby角色):
NOT ALLOWED PHYSICAL STANDBY
3.在主库上执行切换命令(primary节点)
sql> alter database commit to switchover to physical standby; --将primary角色转换为standby角色
Database altered.
sql> shutdown immediate --关闭数据库,启动到mount状态
ORA-01507: database not mounted
ORACLE instance shut down.
sql> startup mount
Total System Global Area 830930944 bytes
Fixed Size 2217912 bytes
Variable Size 545261640 bytes
Database Buffers 281018368 bytes
Redo Buffers 2433024 bytes
Database mounted.
TO PRIMARY PHYSICAL STANDBY
4.在备库上执行(standby节点)
sql> alter database commit to switchover to primary; --将备库的角色修改为primary
NOT ALLOWED PRIMARY
sql> alter database open; --打开数据库
5.在备库上执行(
RECOVERY NEEDED PHYSICAL STANDBY
sql> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE USING CURRENT LOGFILE DISCONNECT FROM SESSION; --修改以前主库为日志应用
sql>
6.测试主备节点是否切换成功
dg2节点(primary角色):
sql> select * from tt;
A
----------
1
3
4
5
6
7
6 rows selected.
sql> insert into tt values(8);
1 row created.
sql> commit;
Commit complete.
sql> select * from tt where a=8;
8
sql> alter system switch logfile;
System altered.
sql> /
Database log mode Archive Mode
Automatic archival Enabled
Archive destination /u01/oradata/tong/archive
Oldest online log sequence 78
Next log sequence to archive 80
Current log sequence 80
dg1节点(standby角色):
Oldest online log sequence 79
Next log sequence to archive 0
sql> alter database recover managed standby database cancel;
sql> alter database open read only;
1
3
4
5
6
7
8
7 rows selected.
sql>
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