Managing Implementation and Ensuring Solution and Operations Reliability →hardMultiple ChoiceObjective-mapped
Google PCA Practice Question: Managing Implementation and Ensuring Solution and Operations Reliability
An organization uses Cloud Spanner with a multi-region configuration to achieve 99.999% availability for their global user base. They notice an increase in write latency during peak hours. Which action would MOST effectively reduce write latency?
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
✓
Add more nodes to the Spanner instance
In Cloud Spanner, write latency can be reduced by adding more nodes (increasing throughput) or optimizing schema. Adding nodes provides more compute and I/O capacity, reducing queuing and latency.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use a stronger read consistency level
Why it's wrong here
Stronger consistency (e.g., strong reads) may increase latency; it does not reduce write latency.
- ✗
Change from a multi-region to a single-region configuration
Why it's wrong here
This would reduce write latency due to less replication, but would compromise global availability and durability.
- ✗
Enable follower reads
Why it's wrong here
Follower reads reduce read latency but do not affect write latency.
- ✓
Add more nodes to the Spanner instance
Why this is correct
Adding nodes increases throughput and reduces write latency by providing more resources.
Go deeper
Related to this question
Learn chapter
Introduction to Google Cloud Platform
Key term
Throughput
Throughput is the rate at which data is successfully transferred from one point to another over a network, typically measured in bits per second.
Key term
Cloud Spanner
Cloud Spanner is a fully managed, globally distributed relational database service from Google Cloud that combines the benefits of relational database structure with horizontal scalability and strong consistency.
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Written by Johnson Ajibi, MSc IT Security
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This PCA 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 PCA exam.