前段时间一朋友在生产库上误操作，本来他是打算重启一下DG环境，结果在备库命令执行错误。 

本应该执行

SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE CANCEL; 

结果朋友执行成了如下命令：

SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE FINISH; 

中断了DG主备库的通信环境，这个finish是用来做Failover时用的。 当时让朋友在主库重新生成了一份standby controlfiles，然后copy到备库，在按正常模式启动就可以了。 

因为数据库识别主备库就是通过控制文件来的，所以理论上，只需要重新生成一份standby 控制文件就可以了。 后来朋友测试了一下，正常的拉起来了。 

今天看到了当时的记录，就顺便模拟一下整个操作，顺便练练手。 

OS： Oracle Linux6.3

DB： 11.2.0.3

SQL> select * from v$version;

BANNER

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

Oracle Database 11g Enterprise EditionRelease 11.2.0.3.0 - 64bit Production

PL/SQL Release 11.2.0.3.0 - Production

CORE 11.2.0.3.0 Production

TNS for Linux: Version 11.2.0.3.0 -Production

NLSRTL Version 11.2.0.3.0 - Production

主库：

SQL> select open_mode from v$database;

OPEN_MODE

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

READ WRITE

SQL>

SQL> set pagesize 200

SQL> select sequence#,applied fromv$archived_log order by sequence# desc;

SEQUENCE# APPLIED

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

14 YES

14 NO

13 YES

13 NO

12 NO

12 YES

11 YES

11 NO

10 NO

10 YES

9 YES

9 NO

8 NO

8 YES

7 YES

7 NO

6 YES

6 NO

5 NO

4 NO

20 rows selected.

备库：

SQL> select open_mode from v$database;

OPEN_MODE

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

MOUNTED

SQL>

SQL> select sequence#,applied fromv$archived_log order by sequence# desc;

SEQUENCE# APPLIED

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

14 YES

13 YES

12 YES

11 YES

10 YES

9 YES

8 YES

7 YES

6 YES

9 rows selected.

在备库执行如下命令：

SQL> ALTER DATABASE RECOVER MANAGEDSTANDBY DATABASE FINISH;

Database altered.

[oracle@dg1 trace]$ pwd

/u01/app/oracle/diag/rdbms/dave_pd/dave/trace

[oracle@dg1 trace]$ tail -30 alert_dave.log

Thread 1 advanced to log sequence 14 (LGWRswitch)

Current log# 2 seq# 14 mem# 0: /u01/app/oracle/oradata/dave/redo02.log

Fri Mar 29 03:30:12 2013

Archived Log entry 17 added for thread 1sequence 13 ID 0x3312f7c4 dest 1:

Fri Mar 29 03:30:13 2013

LNS: Standby redo logfile selected forthread 1 sequence 14 for destination LOG_ARCHIVE_DEST_2

Fri Mar 29 03:43:10 2013

Time drift detected. Please check VKTMtrace file for more details.

Fri Mar 29 04:45:31 2013

Time drift detected. Please check VKTMtrace file for more details.

Fri Mar 29 06:28:35 2013

Time drift detected. Please check VKTMtrace file for more details.

Fri Mar 29 07:08:14 2013

Thread 1 advanced to log sequence 15 (LGWRswitch)

Current log# 3 seq# 15 mem# 0: /u01/app/oracle/oradata/dave/redo03.log

Fri Mar 29 07:08:16 2013

Archived Log entry 20 added for thread 1sequence 14 ID 0x3312f7c4 dest 1:

Fri Mar 29 07:08:17 2013

LNS: Standby redo logfile selected forthread 1 sequence 15 for destination LOG_ARCHIVE_DEST_2

Fri Mar 29 07:34:48 2013

Time drift detected. Please check VKTMtrace file for more details.

Fri Mar 29 07:48:55 2013

LNS: Attempting destinationLOG_ARCHIVE_DEST_2 network reconnect (3135)

LNS: Destination LOG_ARCHIVE_DEST_2 networkreconnect abandoned

Error 3135 for archive log file 3 to'dave_st'

Errors in file/u01/app/oracle/diag/rdbms/dave_pd/dave/trace/dave_nsa2_3181.trc:

ORA-03135: connection lost contact

LNS: Failed to archive log 3 thread 1sequence 15 (3135)

Fri Mar 29 07:51:45 2013

PING[ARC1]: Heartbeatfailed to connect to standby 'dave_st'. Error is 16143.

因为我们在备库执行的Finish命令，导致心跳中断了。

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