4.3丢失多个数据文件，实现整个数据库的恢复
4.3.1 OS备份方案
OS备份归档模式下损坏（丢失）多个数据文件，进行整个数据库的恢复
1、 连接数据库，创建测试表并插入记录
SQL*Plus: Release 8.1.6.0.0 - Production on Tue May 6 13:46:32 2003
(c) Copyright 1999 Oracle Corporation. All rights reserved.
SQL> connect internal/password as sysdba;
Connected.
SQL> create table test(a int);
Table created
SQL> insert into test values(1);
1 row inserted
SQL> commit;
Commit complete
2、 备份数据库，备份除临时数据文件后的所数据文件
SQL> @hotbak.sql 或在DOS下 svrmgrl @hotbak.sql
3、 继续在测试表中插入记录
SQL> insert into test values(2);
1 row inserted
SQL> commit;
Commit complete
SQL> select * from test;
A
---------------------------------------
1
2
SQL> alter system switch logfile;
System altered.
SQL> alter system switch logfile;
System altered.
4、 关闭数据库，模拟丢失数据文件
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down
C:\>del D:\ORACLE\ORADATA\TEST\SYSTEM01.DBF
C:\>del D:\ORACLE\ORADATA\TEST\INDX01.DBF
C:\>del D:\ORACLE\ORADATA\TEST\TOOLS01.DBF
C:\>del D:\ORACLE\ORADATA\TEST\RBS01.DBF
模拟媒体毁坏（这里删除多个数据文件）
5、 启动数据库，检查错误
SQL> STARTUP
ORACLE instance started.
Total System Global Area 102020364 bytes
Fixed Size 70924 bytes
Variable Size 85487616 bytes
Database Buffers 16384000 bytes
Redo Buffers 77824 bytes
Database mounted.
ORA-01157: cannot identify/lock data file 1 - see DBWR trace file
ORA-01110: data file 1: 'D:\ORACLE\ORADATA\TEST\SYSTEM01.DBF'
详细信息可以查看报警文件
ORA-1157 signalled during: ALTER DATABASE OPEN...
Thu May 08 09:39:36 2003
Errors in file D:\Oracle\admin\test\bdump\testDBW0.TRC:
ORA-01157: cannot identify/lock data file 1 - see DBWR trace file
ORA-01110: data file 1: 'D:\ORACLE\ORADATA\TEST\SYSTEM01.DBF'
ORA-27041: unable to open file
OSD-04002: unable to open file
O/S-Error: (OS 2) 系统找不到指定的文件。
Thu May 08 09:39:36 2003
Errors in file D:\Oracle\admin\test\bdump\testDBW0.TRC:
ORA-01157: cannot identify/lock data file 2 - see DBWR trace file
ORA-01110: data file 2: 'D:\ORACLE\ORADATA\TEST\RBS01.DBF'
ORA-27041: unable to open file
OSD-04002: unable to open file
O/S-Error: (OS 2) 系统找不到指定的文件。
Thu May 08 09:39:36 2003
Errors in file D:\Oracle\admin\test\bdump\testDBW0.TRC:
ORA-01157: cannot identify/lock data file 5 - see DBWR trace file
ORA-01110: data file 5: 'D:\ORACLE\ORADATA\TEST\TOOLS01.DBF'
ORA-27041: unable to open file
OSD-04002: unable to open file
O/S-Error: (OS 2) 系统找不到指定的文件。
Thu May 08 09:39:36 2003
Errors in file D:\Oracle\admin\test\bdump\testDBW0.TRC:
ORA-01157: cannot identify/lock data file 6 - see DBWR trace file
ORA-01110: data file 6: 'D:\ORACLE\ORADATA\TEST\INDX01.DBF'
ORA-27041: unable to open file
OSD-04002: unable to open file
O/S-Error: (OS 2) 系统找不到指定的文件。
通过查询v$recover_file可以看到
SQL> select * from v$recover_file;
FILE# ONLINE ERROR CHANGE# TIME
---------- ------- ------------------ ---------- -----------
1 ONLINE FILE NOT FOUND 0
2 ONLINE FILE NOT FOUND 0
5 ONLINE FILE NOT FOUND 0
6 ONLINE FILE NOT FOUND 0
有四个数据文件需要恢复
6、 拷贝备份回到原地点(restore)，开始恢复数据库(recover)
restore过程:
C:\>copy D:\DATABAK\SYSTEM01.DBF D:\ORACLE\ORADATA\TEST\
C:\>copy D:\DATABAK\TEST\INDX01.DBF D:\ORACLE\ORADATA\TEST\
C:\>copy D:\DATABAK\TEST\TOOLS01.DBF D:\ORACLE\ORADATA\TEST\
C:\>copy D:\DATABAK\TEST\RBS01.DBF.DBF D:\ORACLE\ORADATA\TEST\
Recover过程:
SQL> recover database;
ORA-00279: change 1073849 generated at 05/08/2003 08:58:35 needed for thread 1
ORA-00289: suggestion : D:\ORACLE\ORADATA\TEST\ARCHIVE\TESTT001S00311.ARC
ORA-00280: change 1073849 for thread 1 is in sequence #311
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
auto
ORA-00279: change 1073856 generated at 05/08/2003 09:03:27 needed for thread 1
ORA-00289: suggestion : D:\ORACLE\ORADATA\TEST\ARCHIVE\TESTT001S00312.ARC
ORA-00280: change 1073856 for thread 1 is in sequence #312
ORA-00278: log file 'D:\ORACLE\ORADATA\TEST\ARCHIVE\TESTT001S00311.ARC' no
longer needed for this recovery
ORA-00279: change 1073858 generated at 05/08/2003 09:11:43 needed for thread 1
ORA-00289: suggestion : D:\ORACLE\ORADATA\TEST\ARCHIVE\TESTT001S00313.ARC
ORA-00280: change 1073858 for thread 1 is in sequence #313
ORA-00278: log file 'D:\ORACLE\ORADATA\TEST\ARCHIVE\TESTT001S00312.ARC' no
longer needed for this recovery
ORA-00279: change 1073870 generated at 05/08/2003 09:11:46 needed for thread 1
ORA-00289: suggestion : D:\ORACLE\ORADATA\TEST\ARCHIVE\TESTT001S00314.ARC
ORA-00280: change 1073870 for thread 1 is in sequence #314
ORA-00278: log file 'D:\ORACLE\ORADATA\TEST\ARCHIVE\TESTT001S00313.ARC' no
longer needed for this recovery
Log applied.
Media recovery complete.
7、打开数据库，检查数据库的数据（完全恢复）
SQL> alter database open;
Database altered.
SQL> select * from test;
A
---------------------------------------
1
2
说明：
1、只要有备份与归档存在，就可以实现数据库的完全恢复（不丢失数据）
2、适合于丢失大量数据文件，或包含系统数据文件在内的数据库的恢复
3、恢复过程在mount下进行，如果恢复成功，再打开数据库，down机时间可能比较长一些。
