1.1. 模拟数据文件丢失

1.1.1查看当前数据文件位置

SQL> set line 200

SQL> col NAME FOR a60

SQL> select file#,tablespace_name,name from v$datafile_header;

FILE# TABLESPACE_NAME NAME

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

1 SYSTEM /u01/app/oracle/oradata/PROD/disk1/system01.dbf

2 UNDOTBS /u01/app/oracle/oradata/PROD/disk1/undotbs01.dbf

3 SYSAUX /u01/app/oracle/oradata/PROD/disk1/sysaux01.dbf

4 EXAMPLE /u01/app/oracle/oradata/PROD/disk1/EXAMPLE_01.dbf

5 INDX /u01/app/oracle/oradata/PROD/disk1/INDX_01.dbf

6 TOOLS /u01/app/oracle/oradata/PROD/disk1/TOOLS_01.dbf

7 USERS /u01/app/oracle/oradata/PROD/disk1/USERS_01.dbf

8 OLTP /u01/app/oracle/oradata/PROD/disk1/OLTP_01.dbf

9 ANING /u01/app/oracle/oradata/PROD/disk1/ANING01.dbf

9 rows selected.

1.1.2在ANING表空间插入测试数据

SQL> create table aning(id number) tablespace aning;

Table created.

SQL> select * from aning;

no rows selected

SQL> insert into aning values(1);

1 row created.

SQL> commit;

Commit complete.

SQL> select * from aning;

ID

----------

1

1.1.3手动删除ANING01.dbf模拟数据文件丢失

[oracle@secdb1 ~]$ ll /u01/app/oracle/oradata/PROD/disk1/ANING01.dbf

-rw-r----- 1 oracle oinstall 94380032 Jan 24 15:04 /u01/app/oracle/oradata/PROD/disk1/ANING01.dbf

SQL> !rm -f /u01/app/oracle/oradata/PROD/disk1/ANING01.dbf

SQL>

[oracle@secdb1 ~]$ ll /u01/app/oracle/oradata/PROD/disk1/ANING01.dbf

ls: /u01/app/oracle/oradata/PROD/disk1/ANING01.dbf: No such file or directory

1.1.4在ANING表空间插入测试数据，失败

SQL> create table aningt1 tablespace aning as select * from dba_objects;

create table aningt1 tablespace aning as select * from dba_objects

*

ERROR at line 1:

ORA-01116: error in opening database file 9

ORA-01110: data file 9: '/u01/app/oracle/oradata/PROD/disk1/ANING01.dbf'

ORA-27041: unable to open file

Linux Error: 2: No such file or directory

Additional information: 3

1.2. 数据库在丢失时没有重启，通过句柄恢复

1.2.1查看dbw进程pid

[oracle@secdb1 ~]$ ps -ef|grep ora_dbw

oracle 3926 1 0 14:54 ? 00:00:00 ora_dbw0_PROD

oracle 6420 6200 0 15:17 pts/2 00:00:00 grep ora_dbw

1.2.2根据pid查找句柄

[oracle@secdb1 ~]$ cd /proc/3926/fd

[oracle@secdb1 fd]$ ll

total 0

lr-x------ 1 oracle oinstall 64 Jan 24 15:20 0 -> /dev/null

lr-x------ 1 oracle oinstall 64 Jan 24 15:20 1 -> /dev/null

lrwx------ 1 oracle oinstall 64 Jan 24 15:20 10 -> /u01/app/oracle/admin/PROD/adump/ora_3918.aud

lr-x------ 1 oracle oinstall 64 Jan 24 15:20 11 -> /dev/zero

lr-x------ 1 oracle oinstall 64 Jan 24 15:20 12 -> /dev/zero

lr-x------ 1 oracle oinstall 64 Jan 24 15:20 13 -> /u01/app/oracle/product/10.2.0/db_1/rdbms/mesg/oraus.msb

lrwx------ 1 oracle oinstall 64 Jan 24 15:20 14 -> /u01/app/oracle/product/10.2.0/db_1/dbs/hc_PROD.dat

lrwx------ 1 oracle oinstall 64 Jan 24 15:20 15 -> /u01/app/oracle/product/10.2.0/db_1/dbs/lkPROD

lrwx------ 1 oracle oinstall 64 Jan 24 15:20 16 -> /u01/app/oracle/oradata/PROD/disk1/control01.ctl

lrwx------ 1 oracle oinstall 64 Jan 24 15:20 17 -> /u01/app/oracle/oradata/PROD/disk2/control02.ctl

lrwx------ 1 oracle oinstall 64 Jan 24 15:20 18 -> /u01/app/oracle/oradata/PROD/disk3/control03.ctl

lrwx------ 1 oracle oinstall 64 Jan 24 15:20 19 -> /u01/app/oracle/oradata/PROD/disk1/system01.dbf

lr-x------ 1 oracle oinstall 64 Jan 24 15:20 2 -> /dev/null

lrwx------ 1 oracle oinstall 64 Jan 24 15:20 20 -> /u01/app/oracle/oradata/PROD/disk1/undotbs01.dbf

lrwx------ 1 oracle oinstall 64 Jan 24 15:20 21 -> /u01/app/oracle/oradata/PROD/disk1/sysaux01.dbf

lrwx------ 1 oracle oinstall 64 Jan 24 15:20 22 -> /u01/app/oracle/oradata/PROD/disk1/EXAMPLE_01.dbf

lrwx------ 1 oracle oinstall 64 Jan 24 15:20 23 -> /u01/app/oracle/oradata/PROD/disk1/INDX_01.dbf

lrwx------ 1 oracle oinstall 64 Jan 24 15:20 24 -> /u01/app/oracle/oradata/PROD/disk1/TOOLS_01.dbf

lrwx------ 1 oracle oinstall 64 Jan 24 15:20 25 -> /u01/app/oracle/oradata/PROD/disk1/USERS_01.dbf

lrwx------ 1 oracle oinstall 64 Jan 24 15:20 26 -> /u01/app/oracle/oradata/PROD/disk1/OLTP_01.dbf

lrwx------ 1 oracle oinstall 64 Jan 24 15:20 27-> /u01/app/oracle/oradata/PROD/disk1/ANING01.dbf (deleted)

lrwx------ 1 oracle oinstall 64 Jan 24 15:20 28 -> /u01/app/oracle/oradata/PROD/disk1/temp01.dbf

lrwx------ 1 oracle oinstall 64 Jan 24 15:20 29 -> /u01/app/oracle/oradata/PROD/disk1/temp1_01.dbf

lr-x------ 1 oracle oinstall 64 Jan 24 15:20 3 -> /dev/null

lrwx------ 1 oracle oinstall 64 Jan 24 15:20 30 -> /u01/app/oracle/oradata/PROD/disk1/temp2_01.dbf

lr-x------ 1 oracle oinstall 64 Jan 24 15:20 4 -> /dev/null

l-wx------ 1 oracle oinstall 64 Jan 24 15:20 5 -> /u01/app/oracle/admin/PROD/udump/prod_ora_3918.trc

l-wx------ 1 oracle oinstall 64 Jan 24 15:20 6 -> /u01/app/oracle/admin/PROD/bdump/alert_PROD.log

lrwx------ 1 oracle oinstall 64 Jan 24 15:20 7 -> /u01/app/oracle/product/10.2.0/db_1/dbs/lkinstPROD (deleted)

l-wx------ 1 oracle oinstall 64 Jan 24 15:20 8 -> /u01/app/oracle/admin/PROD/bdump/alert_PROD.log

lrwx------ 1 oracle oinstall 64 Jan 24 15:20 9 -> /u01/app/oracle/product/10.2.0/db_1/dbs/hc_PROD.dat

1.2.3用句柄还原丢失的数据文件

[oracle@secdb1 fd]$ cp 27 /u01/app/oracle/oradata/PROD/disk1/ANING01.dbf

[oracle@secdb1 fd]$ ll /u01/app/oracle/oradata/PROD/disk1/ANING01.dbf

-rw-r----- 1 oracle oinstall 94380032 Jan 24 15:23 /u01/app/oracle/oradata/PROD/disk1/ANING01.dbf

1.3查询数据文件恢复状态

SQL> select file#,tablespace_name,status from v$datafile_header;

FILE# TABLESPACE_NAME STATUS

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

1 SYSTEM ONLINE

2 UNDOTBS ONLINE

3 SYSAUX ONLINE

4 EXAMPLE ONLINE

5 INDX ONLINE

6 TOOLS ONLINE

7 USERS ONLINE

8 OLTP ONLINE

9 ANING ONLINE

9 rows selected.

1.4在ANING表空间插入测试数据

SQL> create table aningrestore(id number) tablespace aning;

Table created.

SQL> insert into aningrestore values(2);

1 row created.

SQL> commit;

Commit complete.

SQL> create table aningt tablespace aning as select * from dba_objects;

Table created.

1.3恢复ANING表空间数据文件

SQL> alter database datafile 9 offline;

Database altered.

SQL> select file#,tablespace_name,status from v$datafile_header;

FILE# TABLESPACE_NAME STATUS

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

1 SYSTEM ONLINE

2 UNDOTBS ONLINE

3 SYSAUX ONLINE

4 EXAMPLE ONLINE

5 INDX ONLINE

6 TOOLS ONLINE

7 USERS ONLINE

8 OLTP ONLINE

9 ANING OFFLINE

9 rows selected.

SQL> recover datafile 9;

Media recovery complete.

SQL> alter database datafile 9 online;

Database altered.

SQL> select file#,tablespace_name,status from v$datafile_header;

FILE# TABLESPACE_NAME STATUS

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

1 SYSTEM ONLINE

2 UNDOTBS ONLINE

3 SYSAUX ONLINE

4 EXAMPLE ONLINE

5 INDX ONLINE

6 TOOLS ONLINE

7 USERS ONLINE

8 OLTP ONLINE

9 ANING ONLINE