a. 檢查standby的狀態
SQL> select name,database_role,OPEN_MODE,SWITCHOVER_STATUS from v$database; NAME DATABASE_ROLE OPEN_MODE SWITCHOVER_STATUS --------- ---------------- ---------- -------------------- ORCLDB PHYSICAL STANDBY MOUNTED NOT ALLOWED
b.判斷flashback_on是否開啓
SQL> select flashback_on from v$database; FLASHBACK_ON ------------------ YES
c.閃回恢復區設置檢測
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.取消日誌應用
SQL> alter database recover managed standby database cancel; Database altered.
e.創建還原點
SQL> create restore point restore_point_readonly guarantee flashback database; Restore point created.
f.在主庫上進行日誌切換,日誌發送設置爲延遲
SQL> alter system archive log current; System altered. SQL> alter system set log_archive_dest_state_2=defer; System altered.
h.激活備庫到read write狀態，並打開
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.進行read write測試
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.測試結束，準備還原備庫。 先強制啓動到mount狀態，然後進行數據庫閃回
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.將數據庫轉換爲physical standby
SQL> alter database convert to physical standby; Database altered.
l.再次強制啓動到mout狀態，然後應用日誌
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.在主庫把日誌傳送啓用，切換日誌
SQL> alter system set log_archive_dest_state_2=enable; System altered. SQL> alter system archive log current; System altered.
n.觀察備庫日誌，即可發現已經正常切換至physical standby，應用日誌正常。
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'