How many Datastore reads consume each Fetch, Count and Query operations?

Question

I\'m reading on Google App Engine groups many users (Fig1, Fig2, Fig3) that can\'t figure out where the high number of Datastore reads in their billing reports come from.

Answer 1

Just to make sure:

I'm almost sure:

Example.all().count(10000)

This one uses small datastore operations (no need to fetch the entities, only keys), so this would count as 1 read + 10,000 (max) small operations.