一 switch 命令
1 switch命令用途
更新数据文件名为rman下镜像拷贝时指定的数据文件名
更新数据文件名为 set newname 命令指定的名字。
 
2 switch 命令使用前提条件
rman 必须连接到目标数据库
当switch tablespaces、datafiles、tempfiles时，这些文件必须离线
当switch 整个数据库时，数据库不能open

3 注意事项
switch....to copy 命令用于rman命令提示符下
switch没有to copy的命令用于run语句块中
  
4 语法
  第一组
   switch dtabase to copy;                  
   switch datafile number|name to copy;
   switch tablespace name to copy;
  第二组
   switch datafile all;
   switch datafile number|name;
   switch tempfile all;
   
二 举例如下：

例一：用switch datafile number to copy 更新数据文件位置和名字
RMAN> backup as copy datafile 8  format '/oracle/CRM/test.dbf';

Starting backup at 2013-02-22 10:06:21
using channel ORA_DISK_1
using channel ORA_DISK_2
channel ORA_DISK_1: starting datafile copy
input datafile file number=00008 name=/backup/test.dbf
output file name=/oracle/CRM/test.dbf tag=TAG20130222T100621 RECID=14 STAMP=808049181
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:01
Finished backup at 2013-02-22 10:06:22

Starting Control File and SPFILE Autobackup at 2013-02-22 10:06:22
piece handle=/backup/c-3599153036-20130222-01 comment=NONE
Finished Control File and SPFILE Autobackup at 2013-02-22 10:06:25

RMAN> sql 'alter tablespace test offline';

sql statement: alter tablespace test offline

RMAN> switch datafile 8 to copy;

datafile 8 switched to datafile copy "/oracle/CRM/test.dbf"

RMAN> report schema;

Report of database schema for database with db_unique_name CRM

List of Permanent Datafiles
===========================
File Size(MB) Tablespace           RB segs Datafile Name
---- -------- -------------------- ------- ------------------------
1    750      SYSTEM               ***     /oracle/CRM/system01.dbf
2    540      SYSAUX               ***     /oracle/CRM/sysaux01.dbf
3    100      UNDOTBS3             ***     /oracle/CRM/undotbs3.dbf
4    1742     USERS                ***     /backup/users01.dbf
5    500      POS                  ***     /oracle/CRM/pos.dbf
6    100      ERP                  ***     /oracle/CRM/erp.dbf
7    5        USER01               ***     /oracle/CRM/user01.dbf
8    0        TEST                 ***     /oracle/CRM/test.dbf

List of Temporary Files
=======================
File Size(MB) Tablespace           Maxsize(MB) Tempfile Name
---- -------- -------------------- ----------- --------------------
1    218      TEMP                 32767       /oracle/CRM/temp01.dbf
2    3072     MYNEWTEMP            40960       /oracle/CRM/newtemp.dbf

例二 用switch tablespace name to copy更新表空间所有数据文件位置和名字
RMAN> backup  as copy  tablespace  pos format '/oracle/%N%f.dbf';
（%N为表空间名、%f为数据文件绝对文件号）
Starting backup at 2013-02-22 10:55:49
using channel ORA_DISK_1
using channel ORA_DISK_2
channel ORA_DISK_1: starting datafile copy
input datafile file number=00005 name=/oracle/CRM/pos.dbf
channel ORA_DISK_2: starting datafile copy
input datafile file number=00009 name=/oracle/CRM/pos2.dbf
output file name=/oracle/POS9.dbf tag=TAG20130222T105549 RECID=18 STAMP=808052153
channel ORA_DISK_2: datafile copy complete, elapsed time: 00:00:07
output file name=/oracle/POS5.dbf tag=TAG20130222T105549 RECID=19 STAMP=808052179
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:36
Finished backup at 2013-02-22 10:56:25

Starting Control File and SPFILE Autobackup at 2013-02-22 10:56:25
piece handle=/backup/c-3599153036-20130222-03 comment=NONE
Finished Control File and SPFILE Autobackup at 2013-02-22 10:56:28

RMAN> sql 'alter tablespace  pos offline';

sql statement: alter tablespace  pos offline

RMAN> switch tablespace pos to copy;

datafile 5 switched to datafile copy "/oracle/POS5.dbf"
datafile 9 switched to datafile copy "/oracle/POS9.dbf"

RMAN> report schema;

Report of database schema for database with db_unique_name CRM

List of Permanent Datafiles
===========================
File Size(MB) Tablespace           RB segs Datafile Name
---- -------- -------------------- ------- ------------------------
1    750      SYSTEM               ***     /oracle/CRM/system01.dbf
2    540      SYSAUX               ***     /oracle/CRM/sysaux01.dbf
3    100      UNDOTBS3             ***     /oracle/CRM/undotbs3.dbf
4    1742     USERS                ***     /backup/users01.dbf
5    0        POS                  ***     /oracle/POS5.dbf
6    100      ERP                  ***     /oracle/CRM/erp.dbf
7    5        USER01               ***     /oracle/CRM/user01.dbf
8    0        TEST                 ***     /oracle/CRM/test.dbf
9    0        POS                  ***     /oracle/POS9.dbf

List of Temporary Files
=======================
File Size(MB) Tablespace           Maxsize(MB) Tempfile Name
---- -------- -------------------- ----------- --------------------
1    218      TEMP                 32767       /oracle/CRM/temp01.dbf
2    3072     MYNEWTEMP            40960       /oracle/CRM/newtemp.dbf

例三 用switch dtabase to copy更新数据库所有数据文件位置和名字
RMAN> backup as copy database format '/oracle/CRM/test/%N%f.dbf';

Starting backup at 2013-02-22 11:26:52
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=129 device type=DISK
allocated channel: ORA_DISK_2
channel ORA_DISK_2: SID=192 device type=DISK
channel ORA_DISK_1: starting datafile copy
input datafile file number=00004 name=/backup/users01.dbf
channel ORA_DISK_2: starting datafile copy
input datafile file number=00001 name=/oracle/CRM/system01.dbf
output file name=/oracle/CRM/test/SYSTEM1.dbf tag=TAG20130222T112653 RECID=52 STAMP=808054107
channel ORA_DISK_2: datafile copy complete, elapsed time: 00:01:41
channel ORA_DISK_2: starting datafile copy
input datafile file number=00002 name=/oracle/CRM/sysaux01.dbf
output file name=/oracle/CRM/test/USERS4.dbf tag=TAG20130222T112653 RECID=53 STAMP=808054182
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:02:54
channel ORA_DISK_1: starting datafile copy
input datafile file number=00005 name=/oracle/POS5.dbf
output file name=/oracle/CRM/test/SYSAUX2.dbf tag=TAG20130222T112653 RECID=54 STAMP=808054193
channel ORA_DISK_2: datafile copy complete, elapsed time: 00:01:11
channel ORA_DISK_2: starting datafile copy
input datafile file number=00003 name=/oracle/CRM/undotbs3.dbf
output file name=/oracle/CRM/test/UNDOTBS33.dbf tag=TAG20130222T112653 RECID=55 STAMP=808054203
channel ORA_DISK_2: datafile copy complete, elapsed time: 00:00:16
channel ORA_DISK_2: starting datafile copy
input datafile file number=00006 name=/oracle/CRM/erp.dbf
output file name=/oracle/CRM/test/ERP6.dbf tag=TAG20130222T112653 RECID=56 STAMP=808054230
channel ORA_DISK_2: datafile copy complete, elapsed time: 00:00:25
channel ORA_DISK_2: starting datafile copy
input datafile file number=00009 name=/oracle/POS9.dbf
output file name=/oracle/CRM/test/POS5.dbf tag=TAG20130222T112653 RECID=57 STAMP=808054247
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:58
channel ORA_DISK_1: starting datafile copy
input datafile file number=00007 name=/oracle/CRM/user01.dbf
output file name=/oracle/CRM/test/POS9.dbf tag=TAG20130222T112653 RECID=58 STAMP=808054247
channel ORA_DISK_2: datafile copy complete, elapsed time: 00:00:08
channel ORA_DISK_2: starting datafile copy
input datafile file number=00008 name=/oracle/CRM/test.dbf
output file name=/oracle/CRM/test/USER017.dbf tag=TAG20130222T112653 RECID=59 STAMP=808054250
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:00
output file name=/oracle/CRM/test/TEST8.dbf tag=TAG20130222T112653 RECID=60 STAMP=808054250
channel ORA_DISK_2: datafile copy complete, elapsed time: 00:00:01
Finished backup at 2013-02-22 11:30:51

Starting Control File and SPFILE Autobackup at 2013-02-22 11:30:51
piece handle=/backup/c-3599153036-20130222-06 comment=NONE
Finished Control File and SPFILE Autobackup at 2013-02-22 11:30:59

RMAN> switch database to copy;

datafile 1 switched to datafile copy "/oracle/CRM/test/SYSTEM1.dbf"
datafile 2 switched to datafile copy "/oracle/CRM/test/SYSAUX2.dbf"
datafile 3 switched to datafile copy "/oracle/CRM/test/UNDOTBS33.dbf"
datafile 4 switched to datafile copy "/oracle/CRM/test/USERS4.dbf"
datafile 5 switched to datafile copy "/oracle/CRM/test/POS5.dbf"
datafile 6 switched to datafile copy "/oracle/CRM/test/ERP6.dbf"
datafile 7 switched to datafile copy "/oracle/CRM/test/USER017.dbf"
datafile 8 switched to datafile copy "/oracle/CRM/test/TEST8.dbf"
datafile 9 switched to datafile copy "/oracle/CRM/test/POS9.dbf"

RMAN> sql 'alter database open';

sql statement: alter database open

SQL> select file#,name,status from v$datafile;

FILE# NAME                                     STATUS
---------- ---------------------------------------- -------
         1 /oracle/CRM/test/SYSTEM1.dbf             SYSTEM
         2 /oracle/CRM/test/SYSAUX2.dbf             ONLINE
         3 /oracle/CRM/test/UNDOTBS33.dbf           ONLINE
         4 /oracle/CRM/test/USERS4.dbf              ONLINE
         5 /oracle/CRM/test/POS5.dbf                ONLINE
         6 /oracle/CRM/test/ERP6.dbf                ONLINE
         7 /oracle/CRM/test/USER017.dbf             ONLINE
         8 /oracle/CRM/test/TEST8.dbf               ONLINE
         9 /oracle/CRM/test/POS9.dbf                ONLINE
   
   
例四 用switch tempfile all更新所有临时数据文件位置和名字
SQL> select file#,name,status from v$tempfile;

FILE# NAME                                     STATUS
---------- ---------------------------------------- -------
         1 /oracle/CRM/temp01.dbf                   ONLINE
         2 /oracle/CRM/newtemp.dbf                  ONLINE
   
语句如下：   
startup force mount
run{
set newname for tempfile 1 to '/oracle/CRM/test/temp01.dbf';
set newname for tempfile 2 to '/oracle/CRM/test/temp02.dbf';
switch tempfile all;
alter database open;
}

执行过程如下：
RMAN> startup force mount

run{
set newname for tempfile 1 to '/oracle/CRM/test/temp01.dbf';
set newname for tempfile 2 to '/oracle/CRM/test/temp02.dbf';
switch tempfile all;
alter database open;
}
Oracle instance started
database mounted

Total System Global Area    1252663296 bytes

Fixed Size                     2226072 bytes
Variable Size               1006635112 bytes
Database Buffers             234881024 bytes
Redo Buffers                   8921088 bytes

RMAN> 2> 3> 4> 5> 6> 
executing command: SET NEWNAME

executing command: SET NEWNAME

renamed tempfile 1 to /oracle/CRM/test/temp01.dbf in control file
renamed tempfile 2 to /oracle/CRM/test/temp02.dbf in control file

database opened

RMAN> report schema;

Report of database schema for database with db_unique_name CRM

List of Permanent Datafiles
===========================
File Size(MB) Tablespace           RB segs Datafile Name
---- -------- -------------------- ------- ------------------------
1    750      SYSTEM               ***     /oracle/CRM/test/SYSTEM1.dbf
2    540      SYSAUX               ***     /oracle/CRM/test/SYSAUX2.dbf
3    100      UNDOTBS3             ***     /oracle/CRM/test/UNDOTBS33.dbf
4    1742     USERS                ***     /oracle/CRM/test/USERS4.dbf
5    500      POS                  ***     /oracle/CRM/test/POS5.dbf
6    100      ERP                  ***     /oracle/CRM/test/ERP6.dbf
7    5        USER01               ***     /oracle/CRM/test/USER017.dbf
8    1        TEST                 ***     /oracle/CRM/test/TEST8.dbf
9    10       POS                  ***     /oracle/CRM/test/POS9.dbf

List of Temporary Files
=======================
File Size(MB) Tablespace           Maxsize(MB) Tempfile Name
---- -------- -------------------- ----------- --------------------
1    218      TEMP                 32767       /oracle/CRM/test/temp01.dbf
2    3072     MYNEWTEMP            40960       /oracle/CRM/test/temp02.dbf

例五 用switch datafile all更新表空间所有数据位置和名字
语句：
run{
sql 'alter tablespace pos offline immediate';
set newname for datafile '/oracle/CRM/test/POS5.dbf' to '/oracle/CRM/pos1.dbf';
set newname for datafile '/oracle/CRM/test/POS9.dbf' to '/oracle/CRM/pos2.dbf';
restore tablespace pos;
switch datafile all;
recover tablespace pos;
sql 'alter tablespace pos online';
}

执行过程如下：
RMAN> run{
2> sql 'alter tablespace pos offline immediate';
3> set newname for datafile '/oracle/CRM/test/POS5.dbf' to '/oracle/CRM/pos1.dbf';
4> set newname for datafile '/oracle/CRM/test/POS9.dbf' to '/oracle/CRM/pos2.dbf';
5> restore tablespace pos;
6> switch datafile all;
7> recover tablespace pos;
8> sql 'alter tablespace pos online';
9> }

sql statement: alter tablespace pos offline immediate

executing command: SET NEWNAME

executing command: SET NEWNAME

Starting restore at 2013-02-22 15:18:37
using channel ORA_DISK_1
using channel ORA_DISK_2

channel ORA_DISK_1: starting datafile backup set restore
channel ORA_DISK_1: specifying datafile(s) to restore from backup set
channel ORA_DISK_1: restoring datafile 00005 to /oracle/CRM/pos1.dbf
channel ORA_DISK_1: restoring datafile 00009 to /oracle/CRM/pos2.dbf
channel ORA_DISK_1: reading from backup piece /backup/20130222_hho2k7jn_1_1
channel ORA_DISK_1: piece handle=/backup/20130222_hho2k7jn_1_1 tag=TAG20130222T145756
channel ORA_DISK_1: restored backup piece 1
channel ORA_DISK_1: restore complete, elapsed time: 00:00:25
Finished restore at 2013-02-22 15:19:03

datafile 5 switched to datafile copy
input datafile copy RECID=72 STAMP=808067944 file name=/oracle/CRM/pos1.dbf
datafile 9 switched to datafile copy
input datafile copy RECID=73 STAMP=808067944 file name=/oracle/CRM/pos2.dbf

Starting recover at 2013-02-22 15:19:04
using channel ORA_DISK_1
using channel ORA_DISK_2

starting media recovery
media recovery complete, elapsed time: 00:00:00

Finished recover at 2013-02-22 15:19:05

sql statement: alter tablespace pos online

RMAN> report schema;

Report of database schema for database with db_unique_name CRM

List of Permanent Datafiles
===========================
File Size(MB) Tablespace           RB segs Datafile Name
---- -------- -------------------- ------- ------------------------
1    750      SYSTEM               ***     /oracle/CRM/test/SYSTEM1.dbf
2    540      SYSAUX               ***     /oracle/CRM/test/SYSAUX2.dbf
3    100      UNDOTBS3             ***     /oracle/CRM/test/UNDOTBS33.dbf
4    1742     USERS                ***     /oracle/CRM/test/USERS4.dbf
5    500      POS                  ***     /oracle/CRM/pos1.dbf
6    100      ERP                  ***     /oracle/CRM/test/ERP6.dbf
7    5        USER01               ***     /oracle/CRM/test/USER017.dbf
8    1        TEST                 ***     /oracle/CRM/test/TEST8.dbf
9    10       POS                  ***     /oracle/CRM/pos2.dbf

本文转自 zhangxuwl 51CTO博客，原文链接：http://blog.51cto.com/jiujian/1140329，如需转载请自行联系原作者

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