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.) Thanks.