oracle dg狀態檢查

先檢查備庫的歸檔日志同步情況

SELECT NAME,applied FROM v$archived_log;

alter database recover managed standby database cancel;

select thread#,sequence#,standby_dest,archived,applied,status from v$archived_log order by 1,2;

alter database

recover managed standby database using current logfile disconnect from session;

.在備庫查看gap

1.

select * from

v$archive_gap;

ALTER? DATABASE RECOVER MANAGED

STANDBY? DATABASE DISCONNECT FROM SESSION;

查看主庫的基本信息：

SYS@enmo1

hey~1->select open_mode,protection_mode,database_role,switchover_status from

v$database;

OPEN_MODE

PROTECTION_MODE

DATABASE_ROLE

SWITCHOVER_STATUS

-------------------- -----------------------------

------------------------ ------------------------

READ WRITE ? ? ? ? ? MAXIMUM PERFORMANCE

PRIMARY

TO STANDBY

查看備庫的基本信息：

SYS@enmo2

hey~2->select open_mode,protection_mode,database_role,switchover_status from

v$database;

OPEN_MODE

PROTECTION_MODE

DATABASE_ROLE

SWITCHOVER_STATUS

------------------------- -----------------------------

------------------------ ------------------------

READ ONLY WITH APPLY MAXIMUM PERFORMANCE ? ? ?PHYSICAL

STANDBY ? ? ?NOT ALLOWED

備庫應用日志保持和主庫數據一致(如果不一致，執行如下語句應用日志)

SYS@enmo2

hey~2->recover managed standby database using current logfile disconnect

from session;

Media recovery complete.

SYS@enmo2

hey~2->recover managed standby database cancel;

Media recovery complete.

主庫切換到備庫角色并查看切換之后的狀態為RECOVERY NEEDED

SYS@enmo1

hey~1->alter database commit to switchover to physical standby with session

shutdown;

Database

altered.

SYS@enmo1

hey~1->shutdown abort;

ORACLE instance

started.

Total System

Global Area 830930944 bytes

Fixed Size 2257800 bytes

Variable Size 700451960 bytes

Database Buffers 121634816 bytes

Redo Buffers 6586368 bytes

Database mounted.

SYS@enmo1 hey~1->select switchover_status from v$database;

SWITCHOVER_STATUS

--------------------

RECOVERY NEEDED

切換應用日志，然后在查看切換狀態為TO primary正常：

SYS@enmo1

hey~1->recover managed standby database using current logfile disconnect

from session;

Media recovery complete.

SYS@enmo1 hey~1->select switchover_status from v$database;

SWITCHOVER_STATUS

--------------------

TO PRIMARY

備庫切主庫：

SYS@enmo2

hey~2->select open_mode,protection_mode,database_role,switchover_status from

v$database;

OPEN_MODE

PROTECTION_MODE DATABASE_ROLE SWITCHOVER_STATUS

-------------------- -------------------- ----------------

--------------------

MOUNTED MAXIMUM PERFORMANCE PHYSICAL STANDBY TO PRIMARY

SYS@enmo2

hey~2->alter database commit to switchover to primary with session shutdown;

Database

altered.

SYS@enmo2

hey~2->alter database open;

Database

altered.

SYS@enmo2

hey~2->select switchover_status,database_role from v$database;

SWITCHOVER_STATUS

DATABASE_ROLE

-------------------- ----------------

FAILED DESTINATION PRIMARY

SYS@enmo2

hey~2->select open_mode,protection_mode,database_role from v$database;

OPEN_MODE

PROTECTION_MODE DATABASE_ROLE

-------------------- -------------------- ----------------

READ WRITE MAXIMUM PERFORMANCE

PRIMARY

二、備庫不同步的問題檢查方法

1、檢查主備兩邊的序號

select max(sequence#) from v$log;???---檢查發現一致

2、備庫執行，查看是否有數據未應用

select name,SEQUENCE#,APPLIED from v$archived_log order by sequence#;

select

SEQUENCE#,FIRST_TIME,NEXT_TIME ,APPLIED from v$archived_log order by 1;

3、檢查備庫是否開啟實時應用

select recovery_mode from v$archive_dest_status where dest_id=2;

4、檢查備庫狀態

select switchover_status from v$database; --發現狀態not?allowed

3、看看進程MRP是否存在

ps aux|grep mrp??????--發現進程不存在

4、如果不存在執行以下：

alter database recover managed standby database using current logfile

disconnect;

alter

database recover managed standby database disconnect from session;? --后臺執行

alter

database recover managed standby database --前臺執行，執行這個可以看到報錯的情況

如果有報錯，查看alert日志和log.xml日志

5、驗證是否正常

select process,status from v$managed_standby;

select process,status,sequence# from v$managed_standby;

如果看到mrp0正常

6、以上步驟處理好后，如果數據還不正常，接著處理

關閉備庫，接著處理：

把主庫上 undotbs01.dbf 文件，物理的重拷到備庫機上以前undotbs01.dbf 所在目錄下；

$scp /data/oracle/oradata/voip/undotbs01.dbf???192.168.122.204:/data/oracle/oradata/voip

再在主庫上重新生成一個standby control file ，拷到備庫機上相應目錄下，

alter

database create standby controlfile as '/data/oracle/oradata/voip/qyqdg01.ctl'

$scp

/data/oracle/oradata/voip/qyqdg01.ctl

192.168.122.204:/data/oracle/oradata/voip

$ mv?qyqdg01.ctl? control01.ctl

$ cp control01.ctl /data/oracle/flash_recovery_area/qyq/

$cd /data/oracle/flash_recovery_area/qyq/

$ mv control01.ctl? control02.ctl

接著

STARTUP NOMOUNT;

ALTER DATABASE MOUNT STANDBY DATABASE;

ALTER DATABASE RECOVER MANAGED STANDBY DATABASE DISCONNECT FROM SESSION;

--------------------------------------

session恢復完成后，重啟打開備庫；

alter

database open read only;

總結

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