a. 检查standby的状态
SQL> select name,database_role,OPEN_MODE,SWITCHOVER_STATUS from v$database; NAME DATABASE_ROLE OPEN_MODE SWITCHOVER_STATUS --------- ---------------- ---------- -------------------- ORCLDB PHYSICAL STANDBY MOUNTED NOT ALLOWED
b.判断flashback_on是否开启
SQL> select flashback_on from v$database; FLASHBACK_ON ------------------ YES
c.闪回恢复区设置检测
SQL> show parameter db_recovery_file_dest NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ db_recovery_file_dest string /u01/oracle/flash_recovery_are a db_recovery_file_dest_size big integer 2G
d.取消日志应用
SQL> alter database recover managed standby database cancel; Database altered.
e.创建还原点
SQL> create restore point restore_point_readonly guarantee flashback database; Restore point created.
f.在主库上进行日志切换,日志发送设置为延迟
SQL> alter system archive log current; System altered. SQL> alter system set log_archive_dest_state_2=defer; System altered.
h.激活备库到read write状态，并打开
SQL> alter database activate standby database; Database altered. SQL> alter database open; Database altered. SQL> select name,open_mode,database_role,db_unique_name from v$database; NAME OPEN_MODE DATABASE_ROLE DB_UNIQUE_NAME --------- ---------- ---------------- ------------------------------ ORCLDB READ WRITE PRIMARY PHYSTDBY
i.进行read write测试
SQL> create table scott.t as select * from dba_objects; Table created. SQL> select count(*) from scott.t; COUNT(*) ---------- 49745 SQL> truncate table scott.t; Table truncated. SQL> select count(*) from scott.t; COUNT(*) ---------- 0
j.测试结束，准备还原备库。 先强制启动到mount状态，然后进行数据库闪回
SQL> startup mount force ORACLE instance started. Total System Global Area 390070272 bytes Fixed Size 2021024 bytes Variable Size 142608736 bytes Database Buffers 243269632 bytes Redo Buffers 2170880 bytes Database mounted. SQL> flashback database to restore point restore_point_readonly; Flashback complete.
k.将数据库转换为physical standby
SQL> alter database convert to physical standby; Database altered.
l.再次强制启动到mout状态，然后应用日志
SQL> startup mount force ORACLE instance started. Total System Global Area 390070272 bytes Fixed Size 2021024 bytes Variable Size 142608736 bytes Database Buffers 243269632 bytes Redo Buffers 2170880 bytes Database mounted. SQL> alter database recover managed standby database disconnect from session; Database altered.
m.在主库把日志传送启用，切换日志
SQL> alter system set log_archive_dest_state_2=enable; System altered. SQL> alter system archive log current; System altered.
n.观察备库日志，即可发现已经正常切换至physical standby，应用日志正常。
alter database recover managed standby database disconnect from session Sun Jan 5 07:43:47 2014 Attempt to start background Managed Standby Recovery process (PHYSTDBY) MRP0 started with pid=22, OS id=13951 Sun Jan 5 07:43:47 2014 MRP0: Background Managed Standby Recovery process started (PHYSTDBY) Managed Standby Recovery not using Real Time Apply Clearing online redo logfile 1 /u01/oracle/oradata/ORCLDB/redo01.log Clearing online log 1 of thread 1 sequence number 1 Sun Jan 5 07:43:53 2014 Completed: alter database recover managed standby database disconnect from session Sun Jan 5 07:43:55 2014 Clearing online redo logfile 1 complete Media Recovery Log /u01/oracle/arch1/PHYSTDBY/1_39_795970778.dbf Media Recovery Log /u01/oracle/arch1/PHYSTDBY/1_40_795970778.dbf Media Recovery Waiting for thread 1 sequence 41 Sun Jan 5 07:44:56 2014 Redo Shipping Client Connected as PUBLIC -- Connected User is Valid RFS[1]: Assigned to RFS process 13953 RFS[1]: Identified database type as 'physical standby' Primary database is in MAXIMUM AVAILABILITY mode Changing standby controlfile to RESYNCHRONIZATION level Sun Jan 5 07:44:56 2014 RFS LogMiner: Client disabled from further notification Primary database is in MAXIMUM AVAILABILITY mode Changing standby controlfile to MAXIMUM AVAILABILITY level RFS[1]: Successfully opened standby log 4: '/u01/oracle/oradata/ORCLDB/stdby_redo04.log' Sun Jan 5 07:44:56 2014 Redo Shipping Client Connected as PUBLIC -- Connected User is Valid RFS[2]: Assigned to RFS process 13955 RFS[2]: Identified database type as 'physical standby' RFS[2]: Successfully opened standby log 5: '/u01/oracle/oradata/ORCLDB/stdby_redo05.log' Sun Jan 5 07:45:01 2014 Media Recovery Log /u01/oracle/arch1/PHYSTDBY/1_41_795970778.dbf Media Recovery Waiting for thread 1 sequence 42 (in transit) Sun Jan 5 07:45:16 2014 Redo Shipping Client Connected as PUBLIC -- Connected User is Valid RFS[3]: Assigned to RFS process 13959 RFS[3]: Identified database type as 'physical standby'