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Google on Datastore Query, Index, and Transactions

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Google on Datastore Query, Index, and Transactions

· Big Data Zone ·
Free Resource

The open source HPCC Systems platform is a proven, easy to use solution for managing data at scale. Visit our Easy Guide to learn more about this completely free platform, test drive some code in the online Playground, and get started today.

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.


Managing data at scale doesn’t have to be hard. Find out how the completely free, open source HPCC Systems platform makes it easier to update, easier to program, easier to integrate data, and easier to manage clusters. Download and get started today.

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