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Eric is living in Chapel Hill, NC. By night, he writes and edits science fiction. On weekends, he spends too much time making plumbers hop on things. Eric has posted 249 posts at DZone. You can read more from them at their website. View Full User Profile

Google on Datastore Query, Index, and Transactions

02.11.2013
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This Google Developers tutorial delves into querying, indexing, and transactions with App Engine's Datastore service, driven by Google Bigtable:


In this lesson, we will cover topics including Datastore Query and Transaction. The Query is one of the most challenging parts on learning App Engine technologies. You will learn what are rules and practices of the Query, and why they are important to enable the high scalability of the service. Then we will look at some workarounds to cope with the restrictions of the Query. In the latter part of the lesson, we will cover Transaction of Datastore. Especially, understanding the Eventual Consistency of the Query is very important to designing consistent and reliable App Engine application. We will examine how Entity Group and Ancestor Query will ensure Strong Consistency of your application.


Published at DZone with permission of its author, Eric Gregory. (source)

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