oracle db在omf自动管理文件下并在文件存放在ASM里,如果手工rename 一个文件OMF文件,oracle会自动删除原有文件,以下是测试 SQL SELECT file#,name FROM v$datafile; FILE# NAME---------- ----------------------------------------------------------------

oracle db在omf自动管理文件下并在文件存放在ASM里,如果手工rename 一个文件OMF文件,oracle会自动删除原有文件,以下是测试

SQL> SELECT file#,name FROM v$datafile;
 
 FILE# NAME
---------- --------------------------------------------------------------------------------
 1 +ASMDATA/racdb/datafile/system.256.814462679
 2 +ASMDATA/racdb/datafile/sysaux.257.814462681
 3 +ASMDATA/racdb/datafile/undotbs1.258.814462681
 4 +ASMDATA/racdb/datafile/users.259.814462681
 5 +ASMDATA/racdb/datafile/undotbs2.2.814462949
 6 +ASMDATA/racdb/datafile/test.268.815753637
 7 +ASMDATA/racdb/datafile/goldengate.341.820339679
 8 +ASMDATA/racdb/datafile/ccdata.375.844202017
 9 +ASMDATA/racdb/datafile/soe.460.844203543
 10 +ASMDATA/racdb/datafile/big_test.661.852999379
 
10 ROWS selected.

这里先通过rman backup as copy 备份一个文件

[oracle@rac1 ~]$ rman target /
 
Recovery Manager: Release 11.2.0.3.0 - Production ON Fri Jul 18 11:59:24 2014
 
Copyright (c) 1982, 2011, Oracle AND/OR its affiliates. ALL rights reserved.
 
connected TO target DATABASE: RACDB (DBID=812079559)
 
RMAN> backup AS copy datafile 10 format '+ASMDATA/racdb/datafile/big_test01.dbf';
 
Starting backup at 18-JUL-14
USING target DATABASE control file instead OF recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=76 instance=racdb1 device TYPE=DISK
channel ORA_DISK_1: starting datafile copy
INPUT datafile file NUMBER=00010 name=+ASMDATA/racdb/datafile/big_test.661.852999379
output file name=+ASMDATA/racdb/datafile/big_test01.dbf tag=TAG20140718T115951 RECID=4 STAMP=853243196
channel ORA_DISK_1: datafile copy complete, elapsed TIME: 00:00:08
Finished backup at 18-JUL-14
 
RMAN>

[grid@rac1 ~]$ asmcmd
ls -lASMCMD> 
 
State TYPE Rebal Name
MOUNTED EXTERN N ASMDATA/
MOUNTED EXTERN N DATA/
ASMCMD> ASMCMD> 
ASMCMD> ls -l +ASMDATA/racdb/datafile/big_test01.dbf
TYPE Redund Striped TIME Sys Name
 N big_test01.dbf => +ASMDATA/RACDB/DATAFILE/BIG_TEST.6.853243193
ASMCMD> ls -l +ASMDATA/racdb/datafile/big_test.661.852999379
TYPE Redund Striped TIME Sys Name
DATAFILE UNPROT COARSE JUL 18 11:00:00 Y big_test.661.852999379
ASMCMD> ls -l +ASMDATA/racdb/datafile/big_test*
TYPE Redund Striped TIME Sys Name
DATAFILE UNPROT COARSE JUL 18 11:00:00 Y BIG_TEST.661.852999379
DATAFILE UNPROT COARSE JUL 18 11:00:00 Y BIG_TEST.6.853243193
 N big_test01.dbf => +ASMDATA/RACDB/DATAFILE/BIG_TEST.6.853243193

这里直切swtich datafile 看下

RMAN> switch datafile 10 TO copy;
 
USING target DATABASE control file instead OF recovery catalog
datafile 10 switched TO datafile copy "+ASMDATA/racdb/datafile/big_test01.dbf"
RMAN> recover datafile 10;
 
Starting recover at 18-JUL-14
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=80 instance=racdb1 device TYPE=DISK
 
starting media recovery
media recovery complete, elapsed TIME: 00:00:02
 
Finished recover at 18-JUL-14
 
RMAN> SQL 'alter database datafile 10 online';
 
SQL statement: ALTER DATABASE datafile 10 online
 
ASMCMD> ls -l +ASMDATA/racdb/datafile/big_test*
TYPE Redund Striped TIME Sys Name
DATAFILE UNPROT COARSE JUL 18 12:00:00 Y BIG_TEST.661.852999379
DATAFILE UNPROT COARSE JUL 18 12:00:00 Y BIG_TEST.6.853243193
 N big_test01.dbf => +ASMDATA/RACDB/DATAFILE/BIG_TEST.6.853243193

从这里在看两个文件都存在,所以说在文件OMF命名格式下，rman的switch datafile 不会删除文件

下面看下在sqlplus下直接rename

SQL> ALTER DATABASE datafile 10 offline;
 
DATABASE altered.
 
SQL> 
SQL> ALTER DATABASE RENAME file '+ASMDATA/racdb/datafile/big_test01.dbf' TO '+ASMDATA/racdb/datafile/big_test.661.852999379';
 
DATABASE altered.
 
SQL> recover datafile 10;
Media recovery complete.
SQL> ALTER DATABASE datafile 10 online;
 
DATABASE altered.
 
 
Completed: ALTER DATABASE RENAME file '+ASMDATA/racdb/datafile/big_test01.dbf' TO '+ASMDATA/racdb/datafile/big_test.661.852999379'
Fri Jul 18 12:08:21 2014
ALTER DATABASE RECOVER datafile 10 
Media Recovery START
Serial Media Recovery started
WARNING! Recovering DATA file 10 FROM a fuzzy backup. It might be an online
backup taken WITHOUT entering the BEGIN backup command.
Recovery OF Online Redo Log: Thread 1 GROUP 2 Seq 337 Reading mem 0
 Mem# 0: +ASMDATA/racdb/onlinelog/group_2.262.814462797
Media Recovery Complete (racdb1)
Completed: ALTER DATABASE RECOVER datafile 10 
ALTER DATABASE datafile 10 online
Completed: ALTER DATABASE datafile 10 onlin

ASMCMD> ls -l +ASMDATA/racdb/datafile/big_test*
Type Redund Striped Time Sys Name
DATAFILE UNPROT COARSE JUL 18 12:00:00 Y BIG_TEST.661.852999379
DATAFILE UNPROT COARSE JUL 18 12:00:00 Y BIG_TEST.6.853243193
 N big_test01.dbf => +ASMDATA/RACDB/DATAFILE/BIG_TEST.6.853243193

这里看到从手工命令的文件切换到OMF命令的文件，原文件也没用被删除。

看下omf切换到手工命令文件

SQL> ALTER DATABASE datafile 10 offline;
 
DATABASE altered.
 
 
SQL> ALTER DATABASE RENAME file '+ASMDATA/racdb/datafile/big_test.661.852999379' TO '+ASMDATA/racdb/datafile/big_test01.dbf';
 
DATABASE altered.
 
SQL> recover datafile 10;
Media recovery complete.
SQL> ALTER DATABASE datafile 10 online;
 
DATABASE altered.

alter日志文件如下

alter database rename file '+ASMDATA/racdb/datafile/big_test.661.852999379' to '+ASMDATA/racdb/datafile/big_test01.dbf'
Deleted Oracle managed file +ASMDATA/racdb/datafile/big_test.661.852999379
Completed: alter database rename file '+ASMDATA/racdb/datafile/big_test.661.852999379' to '+ASMDATA/racdb/datafile/big_test01.dbf'
Fri Jul 18 12:12:35 2014

明显看出文件被delete ,Deleted Oracle managed file

ASMCMD> ls -l +ASMDATA/racdb/datafile/big_test*
Type Redund Striped Time Sys Name
DATAFILE UNPROT COARSE JUL 18 12:00:00 Y BIG_TEST.6.853243193
 N big_test01.dbf => +ASMDATA/RACDB/DATAFILE/BIG_TEST.6.853243193

从asmcmd看到只剩下一个文件

原文地址：Oracle Db Rname datafile/redofile on ASM, 感谢原作者分享。