- A
Strong consistency and automatic failover across regions
Spanner's core features: globally consistent and automatic failover.
- B
Secondary indexes
Why wrong: Secondary indexes help queries, but not specifically for parent-child join performance.
- C
Bigtable as a caching layer
Why wrong: Bigtable is not part of Spanner; mixing services is not a Spanner feature.
- D
Read replicas for global distribution
Why wrong: Spanner does not use read replicas; it uses multi-region configurations.
- E
Interleaved tables
Interleaved tables physically colocate rows, optimizing joins.
Question 507 of 1,000
PDE Storing the Data Practice Question
This PDE practice question tests your understanding of storing the data. 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 multinational corporation needs a globally distributed database that supports strong consistency, SQL queries, and automatic failover across regions. They also want to optimize join performance for parent-child relationships. Which TWO features of Cloud Spanner should they use?
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
✓
Strong consistency and automatic failover across regions
Cloud Spanner provides strong consistency and automatic failover across regions as core features. Strong consistency ensures that all reads return the most recent write, which is critical for globally distributed databases that require ACID transactions. Automatic failover across regions is built into Spanner's architecture using synchronous replication and Paxos-based consensus, enabling high availability without manual intervention.
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.
- ✓
Strong consistency and automatic failover across regions
Why this is correct
Spanner's core features: globally consistent and automatic failover.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Secondary indexes
Why it's wrong here
Secondary indexes help queries, but not specifically for parent-child join performance.
- ✗
Bigtable as a caching layer
Why it's wrong here
Bigtable is not part of Spanner; mixing services is not a Spanner feature.
- ✗
Read replicas for global distribution
Why it's wrong here
Spanner does not use read replicas; it uses multi-region configurations.
- ✓
Interleaved tables
Why this is correct
Interleaved tables physically colocate rows, optimizing joins.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between secondary indexes and interleaved tables, where candidates mistakenly believe secondary indexes optimize parent-child joins, but interleaved tables are the correct feature for physical co-location and join performance.
Detailed technical explanation
How to think about this question
Interleaved tables physically co-locate parent and child rows on the same storage node, eliminating cross-node network hops for joins and enabling efficient hierarchical queries. Under the hood, Spanner uses TrueTime to globally order transactions and the Paxos protocol to replicate data across zones, ensuring that failover is transparent and consistent. In a real-world scenario, a multinational e-commerce platform using interleaved tables for orders and order items can achieve sub-millisecond join latencies even across continents.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
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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Storing the Data — study guide chapter
Learn the concepts, then practise the questions
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Storing the Data practice questions
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FAQ
Questions learners often ask
What does this PDE question test?
Storing the Data — This question tests Storing the Data — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Strong consistency and automatic failover across regions — Cloud Spanner provides strong consistency and automatic failover across regions as core features. Strong consistency ensures that all reads return the most recent write, which is critical for globally distributed databases that require ACID transactions. Automatic failover across regions is built into Spanner's architecture using synchronous replication and Paxos-based consensus, enabling high availability without manual intervention.
What should I do if I get this PDE 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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jul 4, 2026
This PDE 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 PDE exam.
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