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How to duplicate oracle database in multiple channels?

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I saw on the internet, some oracle duplication commands used multi channels. Their log looks like:

using channel ORA_AUX_DISK_1
using channel ORA_AUX_DISK_2
using channel ORA_AUX_DISK_3
using channel ORA_AUX_DISK_4...

However, when I perform duplication, the rman uses only one channel ORA_AUX_DISK_1. And the performance is very bad. Please tell me how to configure rman when backup to use multi channels to improve duplication performance when duplication. (I duplicate oracle database without target connection.)


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Please explain more details:


AUTOMATIC CHANNEL ALLOCATION  - RMAN Channels can be configured to use a set of default attributes for each operation when a channel is not allocated manually. This set of channels is persistent and can be configured using the CONFIGURE command. When such a set of channels is pre-defined, it is called automatic channel allocation. By default, RMAN configures a channel of device type, DISK, to be used for automatic channel allocation.

If possible, can you give me an example of this configure command for the duplication?

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