Thanks Nick. So can you confirm costs are:
1.) For a projection query, cost is a single read for the entire query
regardless of number of results returned (and same under the new Datastore
pricing)
2.) For a projection query with distinct option, cost is 1 read + 1 read
per entity retrieved
3.) For normal queries ("SELECT * FROM ... " in GQL) under the new (from
July) Datastore pricing, cost is 1 read per entity
Are there drawbacks to the suggestion made by the poster of that link you
specified, in achieving a "SELECT * " at projection query cost, by adding
in a dummy property to the entity kind and then doing a projection query on
the remaining properties? (I suppose the obvious drawback being you'd need
an index for every property)
Thanks,
Alex
On Thursday, April 7, 2016 at 12:31:22 AM UTC+1, Nick (Cloud Platform
Support) wrote:
>
> Hi Alex,
>
> I believe this old App Engine Groups thread
> <https://groups.google.com/forum/#!msg/google-appengine/iL9ci30WSxU/0vLuvv8fAwAJ>
>
> answers your question adequately. Let me know if you have any questions
> after reading.
>
> Cheers,
>
> Nick
> Cloud Platform Community Support
>
> On Wednesday, April 6, 2016 at 10:12:15 AM UTC-4, Alex Kerr wrote:
>>
>> Hi,
>>
>> Can anyone clarify the cost of projection queries please? (both in
>> operations and financially)
>>
>> Datastore pricing page at:
>> https://cloud.google.com/datastore/docs/pricing says a regular query (is
>> that "SELECT * " ?) is 1 read + 1 read per entity retrieved. I get that,
>> but then projection queries are just "1 read" - which implies a cost of 1
>> read total regardless of the number of results returned and the number of
>> properties projected - that can't be right?
>>
>> Also I note the new pricing section from July but still not clear on
>> projection query cost!
>>
>> Many thanks
>> Alex
>>
>
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