Daily Archives: 2011 年 07 月 05 日

Data Guard出现gap sequence修复

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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
--在出现意外datafile header scn不一致的时候,需要根据提示归档日志,找出最小scn

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

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

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

创建standby controlfile两步可以需要根据实际情况考虑,大多数情况下不需要

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

bash shell 中的比较

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文件比较运算符
-e filename 如果 filename存在，则为真 [ -e /var/log/syslog ]
-d filename 如果 filename为目录，则为真 [ -d /tmp/mydir ]
-f filename 如果 filename为常规文件，则为真 [ -f /usr/bin/grep ]
-L filename 如果 filename为符号链接，则为真 [ -L /usr/bin/grep ]
-r filename 如果 filename可读，则为真 [ -r /var/log/syslog ]
-w filename 如果 filename可写，则为真 [ -w /var/mytmp.txt ]
-x filename 如果 filename可执行，则为真 [ -L /usr/bin/grep ]
filename1-nt filename2 如果 filename1比 filename2新，则为真 [ /tmp/install/etc/services -nt /etc/services ]
filename1-ot filename2 如果 filename1比 filename2旧，则为真 [ /boot/bzImage -ot arch/i386/boot/bzImage ]
字符串比较运算符 （请注意引号的使用，这是防止空格扰乱代码的好方法）
-z string 如果 string长度为零，则为真 [ -z “$myvar” ]
-n string 如果 string长度非零，则为真 [ -n “$myvar” ]
string1= string2 如果 string1与 string2相同，则为真 [ “$myvar” = “one two three” ]
string1!= string2 如果 string1与 string2不同，则为真 [ “$myvar” != “one two three” ]
算术比较运算符
num1-eq num2 等于 [ 3 -eq $mynum ]
num1-ne num2 不等于 [ 3 -ne $mynum ]
num1-lt num2 小于 [ 3 -lt $mynum ]
num1-le num2 小于或等于 [ 3 -le $mynum ]
num1-gt num2 大于 [ 3 -gt $mynum ]
num1-ge num2 大于或等于 [ 3 -ge $mynum ]