I'm planning a backend with Google App Engine application for Android. I would like some clarification as regards to Small operation. I did not understand if, for example:
Key key = ...
Entity entity = datastore.get(key)
From the documentation:
Small datastore operations include calls to allocate datastore ids or keys-only queries, and these operations are free.
get operation is a regular read, not a small operation. Here is an example of a small operation:
Query q = new Query("Photo").setKeysOnly();
When you run this query, it will result a bunch of small operations (depending on how many entities it finds).