Comparison to Datastore
Both platforms implement similar indexing strategies, although Firestore offers additional consistency guarantees using broader collections, due to the fact that Firestore implements shallow queries within the collections. By far the most significant difference between Datastore and Firestore is that Firestore is a real-time database. Up to 100,000 concurrent users may subscribe to Firestore and be notified when data changes occur, instead of constantly polling the database to identify changes.
Additionally, Firestore offers a number of Firebase integrations and mobile-first features such as Firebase Rules and user roles. Support for integrations with services external to the Firebase ecosystem is currently limited, ...
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