一、出现gap sequence现象
SQL> alter database open;
alter database open
*
第 1 行出现错误:
今天的dataguard ，备库恢复open时报错：
SQL> select max(sequence#) from v$archived_log;
MAX(SEQUENCE#)
--------------
15
在主库上看到的log：
Tue Jan 03 19:11:20 2012
FAL[server]: Fail to queue the whole FAL gap
GAP - thread 1 sequence 8-8
DBID 1778268600 branch 770765436
备库的alert 日志：
FAL[client]: Failed to request gap sequence
GAP - thread 1 sequence 8-8
DBID 1778268600 branch 770765436
FAL[client]: All defined FAL servers have been attempted.
-------------------------------------------------------------
Check that the CONTROL_FILE_RECORD_KEEP_TIME initialization
parameter is defined to a value that is sufficiently large
enough to maintain adequate log switch information to resolve
archivelog gaps.
二、修复操作
1、查询备库的scn
SQL> select current_scn from v$database;
CURRENT_SCN
-----------
614090
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$datafile where CREATION_CHANGE# > =614090;
未选定行
3、备库停止日志应用
SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE CANCEL;
4、主库增量备份并传输到备库上
主库进行增量备份
RMAN> backup incremental from scn 614090 database format 'C:\soft\sheng_U%' tag 'shp';
说明：主库之前必须要做过rman的全备（没有全备的库，基于scn的增量备份也能够成功）
5、备库上进行恢复
RMAN> catalog start with 'C:\soft';
RMAN> RECOVER DATABASE NOREDO;
说明：CATALOG START WITH是10g及其以后版本中才存在功能，没有该功能可以采用catalog或者复制主库的控制文件，rman备份放置和主库备份时相同目录实现。
6、主库上创建standby controlfile文件并传输到备库
RMAN> backup current controlfile for standby format 'C:\soft\sheng_ctl.bck';
7、备库恢复控制文件
RMAN> shutdown;
RMAN> STARTUP NOMOUNT;
RMAN> restore standby controlfile from 'C:\soft\SHENG_CTL.BCK';
RMAN> alter database mount;
8、清空备库日志组
SQL> ALTER DATABASE CLEAR LOGFILE GROUP 1;
注：如果采用了standby log模式，不需要清空，如果清空会出现
SQL> ALTER DATABASE CLEAR LOGFILE GROUP 1;
ALTER DATABASE CLEAR LOGFILE GROUP 1
*
ERROR at line 1:
ORA-19527: physical standby redo log must be renamed
ORA-00312: online log 1 thread 1: ‘c:\....\redo01.log’
说明：如果没有采用standby log模式，有几组需要清空几组
9、备库重设flashback
SQL> ALTER DATABASE FLASHBACK OFF;
SQL> ALTER DATABASE FLASHBACK ON;
10、备库重新接收并应用日志
SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE DISCONNECT FROM SESSION;
----------------------
我试做上面的操作，发现由于redo位置不同，而引发错误：
发现备库的alert:
RFS[1]: Unable to open standby log 6: 313
Tue Jan 03 20:23:16 2012
Errors in file c:\oracle\product\10.2.0\admin\sheng\udump\sheng_rfs_2000.trc:
ORA-00313: open failed for members of log group 7 of thread 1
ORA-00312: online log 7 thread 1: 'D:\ORACLE\PRODUCT\10.2.0\ORADATA\SHENG\REDO07.LOG'
ORA-27041: unable to open file
OSD-04002: 无法打开文件
O/S-Error: (OS 21) 设备未就绪。
检查一下log 位置，发现有问题：
SQL> select * from v$logfile;
行将被截断
GROUP# STATUS TYPE MEMBER
---------- ------- ------- -----------------------------------------------------
3 ONLINE D:\ORACLE\PRODUCT\10.2.0\ORADATA\SHENG\REDO03.LOG
2 ONLINE D:\ORACLE\PRODUCT\10.2.0\ORADATA\SHENG\REDO02.LOG
1 ONLINE D:\ORACLE\PRODUCT\10.2.0\ORADATA\SHENG\REDO01.LOG
SQL> select * from v$log;
在列 FIRST_CHANGE# 前截断 (按要求)
GROUP# THREAD# SEQUENCE# BYTES MEMBERS ARC STATUS FIRS
---------- ---------- ---------- ---------- ---------- --- ---------------- ----
1 1 17 52428800 1 YES CLEARING 03-1
3 1 16 52428800 1 YES INACTIVE