Thanks, I have read this post before I sent my question to the group. 
However it 1 count() operation is much more "cheaper" that loading one 
entity (that in the collection I checked takes ~7 Datastore Key Fetch Ops on 
average).   

Actually I need to reformulate the question I originally asked:

*  Is there anything I can do in order to decrease number of Datastore 
Small Operations beside attempting to memcache counts and the entire 
repository to memcache? *

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