Oracle数据库中各种类型的文件损坏与修复过程详解(1)
Oracle数据库的文件有哪些种类呢？这些文件在什么情况下容易被损坏呢？损坏以后又该怎么样去修复呢？本文就介绍了这些内容，包括了10中Oracle文件的损坏与修复的过程，这10种文件几乎涵盖了Oracle数据库中所有类型的文件，接下来就让我们一起来了解一下这10种文件的损坏与修复的过程吧。
一、数据库服务器基本情况
OS：RHEL 3
CPU：4个Intel(R) Xeon(TM) MP CPU 2.70GHz
Mem：8G
Swap：16G
Disk：120G
Oracle Database 10g Enterprise Edition Release 10.1.0.3.0
二、备份方式
数据库以archive模式运行，RMAN多级增量备份。策略如下：
设置控制文件自动备份。
每三个月做一个数据库的全备份（包括所有得数据库和只读表空间）,并备份归档日志。
每一个月做一次零级备份（不包含只读表空间），并备份归档日志。
每周做一次一级备份，并备份归档日志。
每天做一次二级备份，并备份归档日志。
三、恢复案例
所有恢复的前提：已经做过数据库全备份（包括归档日志），控制文件和spfile自动备份。
1.损坏一个数据文件
（1）故障模拟
删除数据文件：rm /u02/oradata/dbnms/users01.dbf
关闭数据库：shutdown immediate;
- ORA-01116: error in opening database file 4
- ORA-01110: data file 4: '/u02/oradata/dbnms/users01.dbf'
- ORA-27041: unable to open file
- Linux Error: 2: No such file or directory
- Additional information: 3
强行关闭：sutdown abort;
启动数据库：startup;
- ORA-01157: cannot identify/lock data file 4 - see DBWR trace file
- ORA-01110: data file 4: '/u02/oradata/dbnms/users01.dbf'
（2）恢复步骤
- rman target sys@dbnms catalog rmanuser@cata
- run{
- allocate channel c1 type disk;
- restore datafile 4;
- recover datafile 4;
- sql 'alter database datafile 4 online';
- sql 'alter database open';
- release channel c1;
- }
- sqlplus sys as sysdba
- select instance_name,status from v$instance;
- INSTANCE_NAME STATUS
- ---------------- ------------
- dbnms OPEN
恢复成功。
2.损坏全部数据文件
（1）故障模拟
删除数据文件：rm /u02/oradata/dbnms/*.dbf
强行关闭：sutdown abort;
启动数据库：startup;
- ORA-01157: cannot identify/lock data file 1 - see DBWR trace file
- ORA-01110: data file 1: '/u02/oradata/dbnms/system01.dbf'
（2）恢复步骤
- rman target sys@dbnms catalog rmanuser@cata
- run{
- allocate channel c1 type disk;
- restore database;
- recover database;
- sql 'alter database open';
- release channel c1;
- }
- sqlplus sys as sysdba
- select instance_name,status from v$instance;
- INSTANCE_NAME STATUS
- ---------------- ------------
- dbnms OPEN
恢复临时文件：
- alter database tempfile '/u02/oradata/dbnms/temp01.dbf' drop;
- alter tablespace temp add tempfile '/u02/oradata/dbnms/temp01.dbf' size 50M autoextend on next 5M maxsize unlimited;
恢复成功。
3.损坏非当前联机日志成员
（1）故障模拟
删除日志文件：rm /u02/oradata/dbnms/redo01.log
关闭数据库：shutdown immediate;
启动数据库：startup;
- select * from v$logfile;
- GROUP# STATUS TYPE MEMBER IS_
- ---------- ------- ------- ------------------------------ ---
- 3 ONLINE /u02/oradata/dbnms/redo03.log NO
- 2 STALE ONLINE /u02/oradata/dbnms/redo02.log NO
- 1 INVALID ONLINE /u02/oradata/dbnms/redo01.log NO
- 1 STALE ONLINE /u02/oradata/dbnms/redo11.log NO
- 1 STALE ONLINE /u02/oradata/dbnms/redo21.log NO
- 2 STALE ONLINE /u02/oradata/dbnms/redo12.log NO
- 3 ONLINE /u02/oradata/dbnms/redo13.log NO
- 2 STALE ONLINE /u02/oradata/dbnms/redo22.log NO
- 3 ONLINE /u02/oradata/dbnms/redo23.log NO
- 4 ONLINE /u02/oradata/dbnms/redo31.log NO
- 4 ONLINE /u02/oradata/dbnms/redo32.log NO
- GROUP# STATUS TYPE MEMBER IS_
- ---------- ------- ------- ------------------------------ ---
- 4 ONLINE /u02/oradata/dbnms/redo33.log NO
（2）恢复步骤
- alter database drop logfile member '/u02/oradata/dbnms/redo01.log';
- alter database add logfile member '/u02/oradata/dbnms/redo01.log' to group 1;
恢复成功.
4.损坏非当前联机日志组
（1）故障模拟
删除日志文件组1的所有文件：
- rm /u02/oradata/dbnms/redo01.log
- rm /u02/oradata/dbnms/redo11.log
- rm /u02/oradata/dbnms/redo21.log
关闭数据库：shutdown immediate;
启动数据库：startup;
- Database mounted.
- ORA-00313: open failed for members of log group 1 of thread 1
- ORA-00312: online log 1 thread 1: '/u02/oradata/dbnms/redo11.log'
- ORA-00312: online log 1 thread 1: '/u02/oradata/dbnms/redo21.log'
- ORA-00312: online log 1 thread 1: '/u02/oradata/dbnms/redo01.log'
（2）恢复步骤
- alter database clear logfile group 1;
如果该日志组还没有归档，则用：
- alter database clear unarchived logfile group 1;
打开数据库：
- alter database open;
恢复成功。
