DG 查詢/切換的相關命令

 查看數據庫可進行的角色轉換

1.    $sqlplus / as sysdba

2.    SQL> select switchover_status from gv$database;

查詢主備庫同步情況

3.    select unique thread# as thread,max(sequence#) over(partition by thread#) as last from gv$archived_log;

4.    select thread# ,low_sequence#,high_sequence# from gv$archive_gap;

將主庫切換為備庫

5.    alter database commit to switchover to physical standby with session shutdown ;

6.     select switchover_status from gv$database;

將備庫切換為主庫

7.    select open_mode from gv$database;

8.    select switchover_status from gv$database;

9.    select unique thread# as thread,max(sequence#) over(partition by thread#) as last from gv$archived_log;

10   $ srvctl stop instance –i ebiz2 –d ebizsh

11.SQL> alter database commit to switchover to primary with

session shutdown ;

12. alter database open;

13. $ srvctl start instance –i ebiz2 –d ebizsh

原主庫轉備庫后開始應用日志

14. SQL> alter database recover managed  standby database using current logfile disconnect from session;

15. $ srvctl start instance -d ebiz -i ebiz2

16. SQL> select open_mode from gv$database;

（7） Oracle登錄數據庫服務器，原同城備庫需要在黑龍江和上海主備切換后重新啟動日志應用

17. SQL> alter database recover managed  standby database

using current logfile disconnect from session;

18.  SQL> select status from v$managed_standby where

process like 'MRP%';

只啟動數據庫節點1實例

19.  $ srvctl start instance –i ebiz1 –d ebiz

20.  $ srvctl stop instance –i ebiz2 –d ebiz

繼續進行redo apply

21. SQL> alter database recover managed standby database

using current logfile disconnect;

直至日志同步完畢,SCN號不變，同時檢查 gv$archived_log視圖，序列號達到源端最大值

22.  SQL> select  current_scn from  gv$database;

23. SQL>select unique thread# as thread,max(sequence#)

over(partition by thread#) as last from gv$archived_log;

24.  $asmcmd

25. Cp +DATA_DG/ebiz/archivelog/YYYYMMDD/XXXX 

/rman/backup/ --拷貝至文件系統

ftp或scp至上海

注冊歸檔日志文件

26. SQL >  ALTER DATABASE REGISTER PHYSICAL LOGFILE

'XXXX';

27. Database altered.

然后進行redo apply

28. SQL> alter database recover managed standby database using current logfile disconnect;

29. SQL> alter database commit to switchover to primary with

session shutdown ;

30. SQL> alter database open; SQL> select open_mode from

gv$database;

31.  SQL>  select switchover_status from gv$database;

32. $ srvctl start instance –i ebiz2 –d ebizsh