1.3 Storing and Accessing Data PROFESSIONAL-CLOUD-DEVELOPER Practice Questions (Page 3)

Questions 11–15

1. 11foundation · easy

   In Firestore, what is the recommended way to structure data to avoid write contention on a single document?

   • AUse a map field to store all data in one document
   • BUse a subcollection to store related data as separate documents
   • CCreate a new collection for each user
   • DStore all data in a single document with nested fields
   Reveal Solution Discussion Select an answer first
2. 12application · medium

   A company has a private Cloud Storage bucket with a large video file. They want to allow a user to download the file for a limited time without creating a Google account. What is the most secure way to do this?

   • AMake the object public for a day and then make it private again.
   • BCreate a signed URL with a specific expiration time and share it.
   • CGrant the user the Storage Object Viewer IAM role on the bucket.
   • DCopy the object to a public bucket and share the link.
   Reveal Solution Discussion Select an answer first
4. 13foundation · easy

   What is the consistency model of Cloud Storage for object reads and writes?

   • AEventual consistency
   • BStrong consistency
   • CNo consistency guarantee
   • DRead-after-write consistency
   Reveal Solution Discussion Select an answer first
5. 14application · medium

   A logistics company needs to store GPS telemetry from 50,000 delivery vehicles. Each vehicle sends a small JSON payload every 5 seconds. The data is used for real-time fleet tracking dashboards and for post-hoc route optimization queries that scan hours of data. The team wants to minimize storage cost while keeping write latency under 10 ms. Which storage approach should they use?

   • AIngest payloads into Bigtable with row keys like {vehicleId}#{reverseTimestamp}, and use BigQuery for route optimization via an external table or export.
   • BStore each payload as a document in Firestore in a collection named telemetry, and run route optimization queries directly against Firestore.
   • CWrite each payload as a separate object to Cloud Storage with a key like fleet/{vehicleId}/{timestamp}.json, then use BigQuery for analysis.
   • DInsert each payload into Cloud SQL (PostgreSQL) in a telemetry table with an index on vehicleId and timestamp.
   Reveal Solution Discussion Select an answer first
6. 15application · medium

   A team is using Cloud Bigtable to store time-series data from IoT sensors. Each sensor has a unique ID. The most common query is to retrieve all readings for a specific sensor over a time range. Which row key design is most appropriate?

   • Atimestamp only
   • Btimestamp#sensorID
   • CsensorID#timestamp
   • DsensorID#randomID
   Reveal Solution Discussion Select an answer first