RMAN-10008/RMAN-04006: error from auxiliary database: ORA-12537: TNS:connection closed

Just a short note:

When doing a “duplicate from active database” with a larger amount of channels you need to set the PROCESSES setting in your parameter file to a reasonable high value (i.e. 500). Otherwise the duplicate will fail with:

RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of Duplicate Db command at 03/30/2012 13:56:22
RMAN-05501: aborting duplication of target database
RMAN-12001: could not open channel ORA_AUX_DISK_60
RMAN-10008: could not create channel context
RMAN-10003: unable to connect to target database
RMAN-04006: error from auxiliary database: ORA-12537: TNS:connection closed

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