Duplicate problem with non standard cache sizes

Today I had a problem creating a standby database. Just after RMAN shutdowns and restarts the standby for copying the files, I was getting:

RMAN-05501: aborting duplication of target database
RMAN-03015: error occurred in stored script Memory Script
RMAN-04014: startup failed: ORA-04031: unable to allocate 4128 bytes of sha
red memory (“shared pool”,”unknown object”,”sga heap(1,0)”,”object queue ha
sh buckets”)

After investigating the problem was because I was decreasing the size of SGA on the target database (and putting it on Automatic Memory Management) but not decreasing the non-standard cache settings.
The solution was to add to the duplicate command the decrease of the non-standard cache (on the source it is 800M):
  SET memory_target ‘1G’
  SET db_32k_cache_size ’50M’

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