How fast are App Engine db.get(keys) and A.all(keys_only=True).filter('b =', b).fetch(1000)?

Posted by Liron Shapira on Stack Overflow See other posts from Stack Overflow or by Liron Shapira
Published on 2010-06-17T23:20:47Z Indexed on 2010/06/17 23:23 UTC
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google-app-engine

A db.get() of 50 keys seems to take me 5-6 seconds. Is that normal? What is the time a function of?

I also did a A.all(keys_only=True).filter('b =', b).fetch(1000) where A.b is a ReferenceProperty. I did 50 such round trips to the datastore, with different values of b, and the total time was only 3-4 seconds.

How is this possible? db.get() is done in parallel, with only one trip to the datastore, and I would think that looking up an entity by key is a faster operation than fetch.

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