博客
关于我
ORACLE11g 云上Data Guard环境备库down机恢复实战过程
阅读量:550 次
发布时间:2019-03-09

本文共 5204 字,大约阅读时间需要 17 分钟。

 

 

1、Oracle备库down机

微软云上的oracle备库意外ping不通了,各种报警上来了,联系微软云后台工程师,他们看了下,大概是说文件损坏了,信息如下:

 Checking all file systems.

 [/sbin/fsck.ext4 (1) -- /] fsck.ext4 -a /dev/sda1

 /dev/sda1: clean, 134941/1905008 files, 2416626/7608064 blocks

 [/sbin/fsck.ext4 (1) -- /oracle] fsck.ext4 -a /dev/sdc1

 fsck.ext4: No such file or directory while trying to open /dev/sdc1

 /dev/sdc1:

 The superblock could not be read or does not describe a correct ext2

 filesystem.  If the device is valid and it really contains an ext2

 filesystem (and not swap or ufs or something else), then the superblock

 is corrupt, and you might try running e2fsck with an alternate superblock:

 e2fsck -b 8193 <device> 

[FAILED]

*** An error occurred during the file system check.

*** Dropping you to a shell; the system will reboot

*** when you leave the shell.

Give root password for maintenance

(or type Control-D to continue):

 系统在启动的过程中无法识别/dev/sdc1 的superblock,未能正常启动到login界面,sdc1的superblock损坏。

 

 

 

 

2、尝试界面恢复

给azure云的工程师建议,直接在管理界面关闭,然后再启动,试试看。不知道他们是否采纳了,过了3个小时候后,他们跟我说一句恢复了,oracle备库服务器已经启动起来了。

 

然后我远程登录进去,一看数据文件目录还在,就准备startup,不过startup报错,如下所示

SQL> startup;

ORACLE instance started.

 

Total System Global Area 1.1825E+10 bytes

Fixed Size     2217024 bytes

Variable Size      6106909632 bytes

Database Buffers    5704253440 bytes

Redo Buffers        11849728 bytes

Database mounted.

ORA-10458: standby database requires recovery

ORA-01196: file 1 is inconsistent due to a failed media recovery session

ORA-01110: data file 1: '/home/oradata/powerdes/system01.dbf'

 

 

SQL>

 

 

看到是书籍不一致,所以在启动的时候,尝试介质恢复失败,在system01.dbf这个数据文件上面恢复失败了。

 

 

 

3、启动归档传输

启动归档,必须在mount状态下执行:

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

 

Database altered.

 

SQL>

 

 

 

 

4、实时观察日志应用

实时观察,查看主库备库归档传输完成:

 

# 主库查看:

SQL> select sequence#,applied from v$archived_log order by sequence#;

......

 SEQUENCE# APPLIED

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

     16850 NO

     16850 NO

     16851 NO

     16851 NO

     16852 NO

     16852 NO

     16853 NO

     16853 NO

     16854 NO

     16854 NO

     16855 NO

 

 SEQUENCE# APPLIED

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

     16855 NO

 

5600 rows selected.

 

SQL>

 

 

# 备库查看:

SQL> select sequence#,applied from v$archived_log order by sequence#;

......

 

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

     16844 NO

     16845 NO

     16846 NO

     16847 NO

     16848 NO

     16849 NO

     16850 NO

     16851 NO

     16852 NO

     16853 NO

     16854 NO

 

 SEQUENCE# APPLIED

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

     16855 NO

 

5600 rows selected.

 

SQL>

 

 

 

但是归档传输完成了,只是表面从主库的归档日志已经完全拉到备库了,但是日志应用还没有结束,还在执行中,去alert后台日志就可以看到信息:

Mon Nov 21 19:35:31 2016

Media Recovery Log /oracle/app/oracle/flash_recovery_area/archivelog1_16715_906253421.dbf

Media Recovery Log /oracle/app/oracle/flash_recovery_area/archivelog1_16716_906253421.dbf

Media Recovery Log /oracle/app/oracle/flash_recovery_area/archivelog1_16717_906253421.dbf

Media Recovery Log /oracle/app/oracle/flash_recovery_area/archivelog1_16718_906253421.dbf

Media Recovery Log /oracle/app/oracle/flash_recovery_area/archivelog1_16719_906253421.dbf

Media Recovery Log /oracle/app/oracle/flash_recovery_area/archivelog1_16720_906253421.dbf

Mon Nov 21 19:35:41 2016

Media Recovery Log /oracle/app/oracle/flash_recovery_area/archivelog1_16721_906253421.dbf

Media Recovery Log /oracle/app/oracle/flash_recovery_area/archivelog1_16722_906253421.dbf

Media Recovery Log /oracle/app/oracle/flash_recovery_area/archivelog1_16723_906253421.dbf

Media Recovery Log /oracle/app/oracle/flash_recovery_area/archivelog1_16724_906253421.dbf

Media Recovery Log /oracle/app/oracle/flash_recovery_area/archivelog1_16725_906253421.dbf

Mon Nov 21 19:35:58 2016

Media Recovery Log /oracle/app/oracle/flash_recovery_area/archivelog1_16726_906253421.dbf

Media Recovery Log /oracle/app/oracle/flash_recovery_area/archivelog1_16727_906253421.dbf

Mon Nov 21 19:36:09 2016

Media Recovery Log /oracle/app/oracle/flash_recovery_area/archivelog1_16728_906253421.dbf

 

 

也可以查看dg状态,看到正在应用日志中

SQL> col value for a80

SQL> set linesize 2000

SQL> col name for a50

SQL> col value for a80

SQL> select name,value from v$dataguard_stats;

 

NAME                                                        VALUE

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

transport lag                                            +00 00:00:00

apply lag                                          +02 01:23:55

apply finish time                                      +00 00:06:31.000

estimated startup time                                  11

 

SQL>

 

 

 

等日志应用完成后,再查看后台alert log可以看到:

Media Recovery Log /oracle/app/oracle/flash_recovery_area/archivelog1_16853_906253421.dbf

Mon Nov 21 19:50:21 2016

Media Recovery Log /oracle/app/oracle/flash_recovery_area/archivelog1_16854_906253421.dbf

Mon Nov 21 19:50:31 2016

Media Recovery Log /oracle/app/oracle/flash_recovery_area/archivelog1_16855_906253421.dbf

Media Recovery Waiting for thread 1 sequence 16856 (in transit)

Recovery of Online Redo Log: Thread 1 Group 4 Seq 16856 Reading mem 0

  Mem# 0: /home/oradata/powerdes/redo_dg_021.log

 

 

 

5、打开数据库

SQL> alter database open;

alter database open

*

ERROR at line 1:

ORA-10456: cannot open standby database; media recovery session may be in

progress

 

 

SQL> select name,open_mode from v$database;

 

NAME         OPEN_MODE

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

POWERDES  MOUNTED

 

SQL> alter database recover managed standby database cancel;

 

Database altered.

 

SQL> alter database open;

 

Database altered.

 

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

 

Database altered.

 

SQL>

 

 

至此,oracle备库完全修复完成,主备数据库开始保持一致保持同步。

转载地址:http://nkjsz.baihongyu.com/

你可能感兴趣的文章
mysql查询储存过程,函数,触发过程
查看>>
mysql查询总成绩的前3名学生信息
查看>>
mysql查询慢排查
查看>>
MySQL查询报错ERROR:No query specified
查看>>
mysql查询数据库储存数据的占用容量大小
查看>>
MySQL查询数据库所有表名及其注释
查看>>
MySQL查询数据表中数据记录(包括多表查询)
查看>>
MySQL查询结果排序
查看>>
MYSQL查询语句优化
查看>>
mysql查询语句能否让一个字段不显示出来_天天写order by,你知道Mysql底层执行原理吗?
查看>>
MySQL查询语句:揭秘专家秘籍,让你秒变数据库达人!
查看>>
mysql查询超时对PHP执行的影响
查看>>
mysql查询输出到excel文件_如何保存mysql查询输出到excel或.txt文件?
查看>>
mysql查询过程
查看>>
MySQL模拟Oracle序列sequence
查看>>
Mysql模糊查询like效率,以及更高效的写法
查看>>
MySQL死锁套路:一次诡异的批量插入死锁问题分析
查看>>
Mysql死锁问题Deadlock found when trying to get lock;try restarting transaction
查看>>
mysql每个数据库的最大连接数_MySQL数据库最大连接数
查看>>
Mysql流程控制结构,if函数、case结构、if结构、循环结构
查看>>