Difference between RMAN Allocate channel and Configure Channel

Hello Sir,
It is a very small problem that the more I study about RMAN I get more confused that what is the difference between Allocate Channel and Configure Channel.
The thing I understand is that first we allocate channel and then after we configure it for uses.
Pl. anybody make me clear if it is wrong and please tell me the right theory.
Thanks and regards

Hi,
As Already Aman and Hemant K Chitale .. described the difference..
Let me put up one thing one thing Ahead... !!
CONFIGURE CHANNEL takes the same options used to specify one-time options with the ALLOCATE CHANNEL command. You can configure generic channel settings for a device type, that is, a template that is used for any channels created based on configured settings for that device.
Example :-
Note that if you use CONFIGURE CHANNEL to specify generic channel settings for a device, any previous settings are discarded, even if the settings are not in conflict. For example, after the second CONFIGURE CHANNEL command, which specifies only the FORMAT for configured disk channels, the MAXPIECESIZE for the disk channel is returned to its default value:
CONFIGURE CHANNEL DEVICE TYPE DISK MAXPIECESIZE 2G;
CONFIGURE CHANNEL DEVICE TYPE DISK FORMAT /tmp/%U;
If you manually allocate a channel during a job, then RMAN disregards any configured channel settings. For example, assume that the default device type is SBT, and you execute the following command:
RUN
ALLOCATE CHANNEL c1 DEVICE TYPE DISK;
BACKUP TABLESPACE users;
Ever thing is in ORACLE Documentation.. . (Pick out the things....)
http://download-uk.oracle.com/docs/cd/B28359_01/backup.111/b28270/rcmconfb.htm
Study or Go through Slow and Study... you can understnad ever thing...
- Pavan Kumar N

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