Mark this question as an answered and continue with your other discussion in the following thread. Also, what is the error you are getting in your other thread.
What error your getting and in which location your looking for alert_log.
the duplicate database is failing with ora-01092 error. Sybrand_b suggested to look at the alert_log of the auxilary database. and I am a bit confused on how an alert log would be generated for an auxillary database that has not yet been generated.
Calling krmmpem from krmmmai
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00601: fatal error in recovery manager
RMAN-03004: fatal error during execution of command
RMAN-04006: error from auxiliary database: ORA-01092: ORACLE instance terminated. Disconnection forced
RMAN-03002: failure of Duplicate Db command at 12/27/2013 12:18:10
RMAN-05501: aborting duplication of target database
RMAN-03015: error occurred in stored script Memory Script
ORA-03113: end-of-file on communication channel