Cost of many operations in one transaction

[rekby]

http://www.slideshare.net/ikailan/introducing-the-app-engine-datastore

Slide 80:

- If you write N entities that are all part of 1 entity group, it counts as 1 write.

Is it mean that cost of batch write in transaction will pay as 1 datastore operation?

Do batch/query read many items from 1 entity group pay as 1 datastore operation?

[Max]

by my understanding, batch write on same entity group actually writes only once to datastore.

For your second case, if you do it via async queries, then API call is the same but you will be charged way less CPU time than do it sequentially. 

PS: datastore API call is unlimited, so the only thing need to concern is CPU hour.

[Timofey Koolin]

See new pricing model http://www.google.com/enterprise/appengine/appengine_pricing.html 

2011/7/12 Max <theb...@gmail.com>

by my understanding, batch write on same entity group actually writes only once to datastore.

For your second case, if you do it via async queries, then API call is the same but you will be charged way less CPU time than do it sequentially. 

PS: datastore API call is unlimited, so the only thing need to concern is CPU hour.

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