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I've duplicated quite a few databases and I haven't run into this problem. It sounds like you've read +RMAN Duplicate Database Hangs [ID 198212.1]+. My wild guess is that the memory allocation isn't high enough. I say that because I've always given duplicate instances 1-2GB of memory and I've never run into this problem. I've also never manually set a large pool for duplicate databases.
Maybe check your ASM instance too...
It may have trouble shutting down (immediate ) the auxiliary database . You can check its alert.log file.1 person found this helpful