Delete a datafile in 11gR2 ASM

Here is the current datafiles of the database 11gR2, 11.2.0.1 on the ASM file system.
SQL> select FILE_NAME,TABLESPACE_NAME from dba_data_files;
FILE_NAME TABLESPACE_NAME
+DATA01/heat/datafile/testtbs.274.807968419             TESTTBS
+DATA01/heat/datafile/testtbs.266.807968493             TESTTBS
+DATA01/heat/datafile/testtbs.258.807968511             TESTTBS
1/ Use RMAN to backup the whole db onto the disk
2/ In RMAN, check the backup: List backup; See all the backup including the above data files;
3/ Run this cmd to drop 1 datafile, In SQL> ALTER TABLESPACE TESTTBS drop datafile '+DATA01/heat/datafile/testtbs.258.807968511';
4/ Verify it, whether that data file deleted, yes it was deleted.
SQL> select FILE_NAME,TABLESPACE_NAME from dba_data_files;
FILE_NAME TABLESPACE_NAME
+DATA01/heat/datafile/testtbs.274.807968419             TESTTBS
+DATA01/heat/datafile/testtbs.266.807968493             TESTTBS
5/ In RMAN, check the backup again: List backup; It's not there in the backup. Why's that ?????????????????????
BS Key Type LV Size Device Type Elapsed Time Completion Time
6 Full 935.09M DISK 00:01:15 21-FEB-2013 11:43:44
BP Key: 6 Status: AVAILABLE Compressed: NO Tag: TAG20130221T114228
Piece Name: +FRA01/heat/backupset/2013_02_21/nnndf0_tag20130221t114228_0.344.807968549
List of Datafiles in backup set 6
File LV Type Ckp SCN Ckp Time Name
1 Full 999944 21-FEB-2013 11:42:29 +DATA01/heat/datafile/system.256.807898985
2 Full 999944 21-FEB-2013 11:42:29 +DATA01/heat/datafile/sysaux.261.807898985
3 Full 999944 21-FEB-2013 11:42:29 +DATA01/heat/datafile/undotbs1.260.807898985
4 Full 999944 21-FEB-2013 11:42:29 +DATA01/heat/datafile/users.268.807898985
5 Full 999944 21-FEB-2013 11:42:29 +DATA01/heat/datafile/testtbs.274.807968419
6 Full 999944 21-FEB-2013 11:42:29 +DATA01/heat/datafile/testtbs.266.807968493
7 Full 999944 21-FEB-2013 11:42:29
6/ Try restore the deleted data file, it's not available in the backup ????? I do not understand this ? Really appreciate someone could explain this ?????

When you drop a datafile, the database instance updates controlfiles, redologs and SCN numbers. The datafile you have in your backup will no longer match the the rest of the database environment, so it cannot be restored without restoring the complete database prior to the time the datafile was dropped. Similarly you cannot mount or restore the datafile of a different database. The database does not maintain recovery information for a datafile that does not exist. If you loose the datafile, e.g. delete it from the filesystem, you can restore the datafile and recover the information using the existing controlfile and redologs. That is all normal and is not influenced by ASM.

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Copyright (c) 1982, 2009, Oracle. All rights reserved.
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Copyright (c) 1982, 2006, Oracle. All Rights Reserved.
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Question: 10gR2 database can not see the 11gR2 ASM diskgroup?
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user2281943 wrote:
Hi all,
I want to delete Datafile from my ASM instance. I gave a bad name to my data file and i want to remove it now.
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FILE_NAME TABLESPACE_NAME ONLINE_STATUS
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page 26
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Thanks.

786923 wrote:
Hi all,
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Delete a datafile in 11gR2 ASM

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