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Data Guard出现gap sequence修复

原创 Linux操作系统 作者:season0891 时间:2011-08-24 15:33:03 0 删除 编辑

转自:http://www.xifenfei.com/1176.html

一、出现gap sequence现象
备库
Fetching gap sequence in thread 1, gap sequence 710-716
Tue May 31 15:02:38 2011
FAL[client]: Failed to request gap sequence
GAP – thread 1 sequence 710-716
DBID 3240478808 branch 746916894
FAL[client]: All defined FAL servers have been attempted.
————————————————————-
Check that the CONTROL_FILE_RECORD_KEEP_TIME initialization
parameter is defined to a value that is sufficiently large
enough to maintain adequate log switch information to resolve
archivelog gaps.
————————————————————-
主库
Tue May 31 13:50:47 2011
FAL[server]: Fail to queue the whole FAL gap
GAP – thread 1 sequence 710-716
DBID 3240478808 branch 746916894

二、修复操作
1、查询备库的scn
SQL> SELECT CURRENT_SCN FROM V$DATABASE;
CURRENT_SCN
———–
1154337
目的:1)确定主库在这个scn之后是否有添加数据文件,如果添加文件,需要手工在备库添加
2)确定主库增量备份起点

2、确定主库是否添加数据文件
SQL> select FILE#,name from v$datafile where CREATION_CHANGE#> =1154337;
no rows selected

3、备库停止日志应用
SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE CANCEL;

4、主库增量备份并传输到备库上
主库进行增量备份
RMAN> BACKUP INCREMENTAL FROM SCN 1154337 DATABASE
FORMAT ‘/home/oracle/xff_%U’ tag ‘XIFENFEI’;
[oracle@localhost ~]$ scp xff* 192.168.1.30:/home/oracle/rman
说明:主库之前必须要做过rman的全备(没有全备的库,基于scn的增量备份也能够成功)

5、备库上进行恢复
RMAN> CATALOG START WITH ‘/home/oracle/rman’;
RMAN> RECOVER DATABASE NOREDO;
说明:CATALOG START WITH是10g及其以后版本中才存在功能,没有该功能可以采用catalog或者复制主库的控制文件,rman备份放置和主库备份时相同目录实现。

6、主库上创建standby controlfile文件并传输到备库
RMAN> BACKUP CURRENT CONTROLFILE FOR STANDBY
FORMAT ‘/home/oracle/xff_ctl.bck’;
[oracle@localhost ~]$ scp xff_ctl.bck 192.168.1.30:/home/oracle/rman

7、备库恢复控制文件
RMAN> shutdown;
RMAN> STARTUP NOMOUNT;
RMAN> RESTORE STANDBY CONTROLFILE FROM ‘/home/oracle/rman/xff_ctl.bck’;
RMAN> alter database mount;

8、清空备库日志组
SQL> ALTER DATABASE CLEAR LOGFILE GROUP 1;
注:如果采用了standby log模式,不需要清空,如果清空会出现
SQL> ALTER DATABASE CLEAR LOGFILE GROUP 1;
ALTER DATABASE CLEAR LOGFILE GROUP 1
*
ERROR at line 1:
ORA-19527: physical standby redo log must be renamed
ORA-00312: online log 1 thread 1: ‘/u01/oradata/xienfei/redo01.log’
说明:如果没有采用standby log模式,有几组需要清空几组

9、备库重设flashback
SQL> ALTER DATABASE FLASHBACK OFF;
SQL> ALTER DATABASE FLASHBACK ON;

10、备库重新接收并应用日志
SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE DISCONNECT FROM SESSION;

三、修复成功标志
1、sql中操作
在主库中执行alter system switch logfile;
分别主备库中执行select max(sequence#) from v$archived_log;如果一致标示修复成功

2、通过alert文件
主库
PING[ARC0]: Error 3113 when pinging standby xff.
Tue May 31 14:11:51 2011
Thread 1 advanced to log sequence 719
Current log# 3 seq# 719 mem# 0: /u01/oradata/xienfei/redo03.log
Tue May 31 14:20:05 2011
Thread 1 advanced to log sequence 720
Current log# 1 seq# 720 mem# 0: /u01/oradata/xienfei/redo01.log
Tue May 31 14:20:16 2011
ARC0: Standby redo logfile selected for thread 1 sequence 719 for destination LOG_ARCHIVE_DEST_2

备库
ALTER DATABASE RECOVER MANAGED STANDBY DATABASE DISCONNECT FROM SESSION
Tue May 31 15:30:37 2011
Attempt to start background Managed Standby Recovery process (xff)
MRP0 started with pid=18, OS id=14704
Tue May 31 15:30:37 2011
MRP0: Background Managed Standby Recovery process started (xff)
Managed Standby Recovery not using Real Time Apply
parallel recovery started with 2 processes
Media Recovery Log /u01/archive/1_718_746916894.arc
Tue May 31 15:30:43 2011
Completed: ALTER DATABASE RECOVER MANAGED STANDBY DATABASE DISCONNECT FROM SESSION
Tue May 31 15:30:52 2011
RFS[1]: Successfully opened standby log 4: ‘/u01/oradata/xienfei/s_redo1.log’
Media Recovery Log /u01/archive/1_719_746916894.arc
Media Recovery Waiting for thread 1 sequence 720

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