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Manage a solution that can span multiple database technologies →hardMultiple SelectObjective-mapped

PCDE Practice Question: Manage a solution that can span multiple database technologies

A company uses Cloud Spanner and needs to capture real-time changes from a table for downstream processing. They want to avoid writing custom application code to track changes. Which THREE components should they use? (Choose three.)

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

Pub/Sub

Cloud Spanner Change Streams (option C) capture real-time changes (inserts, updates, deletes) from a table. These changes are automatically published to a Pub/Sub topic (option B). A subscriber can then use Dataflow (option E) to process the change stream messages for downstream transformations or loading. Cloud Bigtable (option A) is a different database service not involved in this scenario. The Cloud Spanner API (option D) is not needed because Change Streams already integrate with Pub/Sub.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

  • ✗

    Cloud Bigtable

    Why it's wrong here

    Bigtable is not involved in capturing Spanner changes.

  • ✓

    Pub/Sub

    Why this is correct

    Change Streams can publish to Pub/Sub for downstream consumption.

  • ✓

    Change Streams

    Why this is correct

    Change Streams capture DML changes in Spanner tables.

  • ✗

    Cloud Spanner API

    Why it's wrong here

    The API is used for general database operations, not specifically for capturing changes; Change Streams are the correct feature.

  • ✓

    Dataflow

    Why this is correct

    Dataflow can read from Pub/Sub and process the change stream events.

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JA

Written by Johnson Ajibi, MSc IT Security

Senior Network & Security Engineer · founder of Courseiva

This PCDE practice question is part of Courseiva's free Google Cloud certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PCDE exam.