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Manage a Solution that Can Span Multiple Database Systems →mediumMultiple ChoiceObjective-mapped

PCD Practice Question: Manage a Solution that Can Span Multiple Database Systems

This PCD practice question tests your understanding of manage a solution that can span multiple database systems. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.

A company has an application using Cloud SQL MySQL and wants to add a caching layer. They also need the cache to persist data across restarts. Which Memorystore tier should they choose?

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

✓

Memorystore for Redis Standard tier

Memorystore for Redis Standard tier is the correct choice because it provides replication (a replica node) and automatic failover, which enables data persistence across restarts. Unlike the Basic tier, which is a single node with no persistence guarantees, the Standard tier uses append-only file (AOF) persistence to ensure data survives node restarts. This meets the requirement for a caching layer that persists data across restarts.

Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Answer analysis

Option-by-option breakdown

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

  • ✗

    Memorystore for Redis Basic tier

    Why it's wrong here

    Basic tier does not persist data.

  • ✓

    Memorystore for Redis Standard tier

    Why this is correct

    Standard tier provides replication and persistence.

    Related concept

    Read the scenario before looking for a memorised answer.

  • ✗

    Memorystore for Memcached

    Why it's wrong here

    Memcached is not persisted.

  • ✗

    Cloud Bigtable

    Why it's wrong here

    Bigtable is not a cache.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The Google PCD exam often tests the distinction between Memorystore tiers by making candidates assume that any Redis tier provides persistence, when in fact only the Standard tier (with replication) guarantees data survival across restarts.

Detailed technical explanation

How to think about this question

Memorystore for Redis Standard tier uses AOF persistence by default, writing every write operation to disk, which allows the cache to recover its state after a restart. The replication in Standard tier also provides high availability; if the primary node fails, the replica is promoted, and the cache remains available. In contrast, the Basic tier runs a single Redis instance with no persistence, making it suitable only for transient data that can be regenerated.

KKey Concepts to Remember

  • Read the scenario before looking for a memorised answer.
  • Find the constraint that changes the correct option.
  • Eliminate answers that are true in general but not in this case.

TExam Day Tips

  • Watch for words such as best, first, most likely and least administrative effort.
  • Review why wrong options are wrong, not only why the correct option is correct.

Key takeaway

Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Real-world example

How this comes up in practice

A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.

What to study next

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this PCD question test?

Manage a Solution that Can Span Multiple Database Systems — This question tests Manage a Solution that Can Span Multiple Database Systems — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Memorystore for Redis Standard tier — Memorystore for Redis Standard tier is the correct choice because it provides replication (a replica node) and automatic failover, which enables data persistence across restarts. Unlike the Basic tier, which is a single node with no persistence guarantees, the Standard tier uses append-only file (AOF) persistence to ensure data survives node restarts. This meets the requirement for a caching layer that persists data across restarts.

What should I do if I get this PCD question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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Last reviewed: Jul 4, 2026

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This PCD 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 PCD exam.