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The Google App Engine datastore provides robust scalable data storage for your web application. The datastore is designed with web applications in mind, with an emphasis on read and query performance. It stores data entities with properties, organized by application-defined kinds. It can perform queries over entities of the same kind, with filters and sort orders on property values and keys. All queries are pre-indexed for fast results over very large data sets. The datastore supports transactional updates, using entity groupings defined by the application as the unit of transactionality in the distributed data network.