Exam Professional Cloud Database Engineer topic 1 question 85 discussion

Actual exam question from Google's Professional Cloud Database Engineer

Question #: 85
Topic #: 1

[All Professional Cloud Database Engineer Questions]

You are designing a physician portal app in Node.js. This application will be used in hospitals and clinics that might have intermittent internet connectivity. If a connectivity failure occurs, the app should be able to query the cached data. You need to ensure that the application has scalability, strong consistency, and multi-region replication. What should you do?

A. Use Firestore and ensure that the PersistenceEnabled option is set to true.
B. Use Memorystore for Memcached.
C. Use Pub/Sub to synchronize the changes from the application to Cloud Spanner.
D. Use Table.read with the exactStaleness option to perform a read of rows in Cloud Spanner.

Show Suggested Answer

Suggested Answer: A 🗳️

by pk349 at Dec. 24, 2022, 11:42 p.m.

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pk349

Highly Voted 2 years, 1 month ago

A: Use Firestore and ensure that the PersistenceEnabled ***** option is set to true. Cloud Firestore is a NoSQL document database that lets you easily store, sync, and query data for your mobile and web apps - at global scale. To use offline persistence, you don't need to make any changes to the code that you use to access Cloud Firestore data. With offline persistence enabled, the Cloud Firestore client library automatically manages online and offline data access and synchronizes local data when the device is back online.

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chelbsik

Highly Voted 2 years, 1 month ago

Selected Answer: A

Intermittment connectivity -> Firestore

upvoted 5 times

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887ad17

Most Recent 6 months, 1 week ago

Selected Answer: A

Firestore meets all the requirements for your physician portal app: Offline Access: With the PersistenceEnabled option, Firestore caches data locally, allowing the app to function during intermittent internet connectivity. Scalability: Firestore is designed to scale automatically with your application's needs. Strong Consistency: Firestore provides strong consistency for read and write operations. Multi-Region Replication: Firestore supports multi-region replication, ensuring high availability and resilience.

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gcp_k

8 months, 3 weeks ago

The answer is: C since the use case is for Strong consistency and multi-regional replication.

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Pime13

1 year, 3 months ago

Selected Answer: A

A: Firestore supports offline data persistence. This feature caches a copy of the Firestore data that your app is actively using, so your app can access the data when the device is offline. You can write, read, listen to, and query the cached data. When the device comes back online, Firestore synchronizes any local changes made by your app to the Firestore backend. https://cloud.google.com/firestore/docs/manage-data/enable-offline

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learnazureportal

1 year, 4 months ago

correct answer is C! Firestore may not provide the same level of strong consistency and multi-region replication as Cloud Spanner. :)

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dynamic_dba

1 year, 10 months ago

A. An app with intermitted internet access meaning it does not HAVE to sync with the live data source must mean Firestore in Datastore mode. The only option that mentions Firestore is A. https://firebase.google.com/docs/firestore/manage-data/enable-offline

upvoted 4 times

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