"Backup optimization on" is not working for "backup database"

Hi,
I am using a windows environment and my database info is like this:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
PL/SQL Release 11.2.0.1.0 - Production
CORE    11.2.0.1.0      Production
TNS for 64-bit Windows: Version 11.2.0.1.0 - Production
NLSRTL Version 11.2.0.1.0 - Productionnow, I change my configuration for backup optimization on and then make example tablespace offline and also make example datafile offline. After that I run 2 times "Backup Database" command but 2 backup has same size and have example tablespace too... Backup archivelog all is working bur backup database is not!
according to this link it must not backup example datafile for second: http://download.oracle.com/docs/cd/E11882_01/backup.112/e10642/rcmconfb.htm#BRADV113
is there something that I missed ?
rman configuration:
CONFIGURE RETENTION POLICY TO REDUNDANCY 5;
CONFIGURE BACKUP OPTIMIZATION ON;
CONFIGURE DEFAULT DEVICE TYPE TO DISK;
CONFIGURE CONTROLFILE AUTOBACKUP ON;
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '%F'; # default
CONFIGURE DEVICE TYPE DISK PARALLELISM 1 BACKUP TYPE TO BACKUPSET;
CONFIGURE DATAFILE BACKUP COPIES FOR DEVICE TYPE DISK TO 1;
CONFIGURE ARCHIVELOG BACKUP COPIES FOR DEVICE TYPE DISK TO 1;
CONFIGURE MAXSETSIZE TO UNLIMITED; # default
CONFIGURE ENCRYPTION FOR DATABASE OFF;
CONFIGURE ENCRYPTION ALGORITHM 'AES128'; # default
CONFIGURE COMPRESSION ALGORITHM 'HIGH' AS OF RELEASE 'DEFAULT' OPTIMIZE FOR LOAD TRUE;
CONFIGURE ARCHIVELOG DELETION POLICY TO NONE; # default
CONFIGURE SNAPSHOT CONTROLFILE NAME TO 'C:\APP\ABC\PRODUCT\11.2.0\DBHOME_1\DATABASE\SNCFORCL.ORA'; # default

If you enable backup optimization, then the BACKUP command skips backing up files when the identical file has already been backed up to the specified device type.
1. In case of datafile RMAN compares the DBID, checkpoint SCN, creation SCN, and RESETLOGS SCN and time as a datafile already in a backup. If they are identical then skip to take backup again.
2. In case of archived redo log RMAN compares thread, sequence number, and RESETLOGS SCN and time.
3. In case of backupset RMAN compares recid and stamp.
Backup optimization applies to only commands,
-BACKUP DATABASE
-BACKUP ARCHIVELOG with ALL or LIKE options
-BACKUP BACKUPSET ALL
refer,
http://www.stanford.edu/dept/itss/docs/oracle/10gR2/backup.102/b14191/rcmconc1008.htm
Thanks

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