When taking manual backups using O/s commands we have to take tablespaces in the BACKUP mode to take ONLINE backups and then after backup is over we have to END the backup mode.
Whereas if you are taking backup using RMAN there is no need to take tablespaces in the BACKUP MODE you can simply take backup by just starting RMAN and typing the backup command.
To take online backup of particular tablespaces using RMAN do the following
Step 1
Start RMAN by typing the following command
$ export ORACLE_SID=test
$ rman target system/manager nocatalog
Then RMAN will get connected to the database and it will show the following messages
Step 2
For Example let's take backup of USERS tablespace
To take the backup of a particular tablespace we have to mentioned the tablespace name in the backup command.
rman> backup tablespace users tag 'usertsbak';
Similarly to take the backup of particular datafiles you can give the following command
rman> backup datafile 2,6 tag 'userdbfbak';
In the above command we are specifying the datafile id's instead of it's path and filename. You can see the file ID from V$DATAFILE view
In the above command 2 is the file ID of example01.dbf and 6 is the ID of users01.dbf
Once you type the above command you will get a output as shown below
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