Google PCA Practice Question: Analyze and optimize technical and business processes
This PCA practice question tests your understanding of analyze and optimize technical and business processes. 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 migrated their on-premises database to Cloud SQL and now experiences high latency for read-heavy workloads. How can they optimize performance?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Add read replicas.
Adding read replicas is the correct optimization because Cloud SQL read replicas offload read traffic from the primary instance, reducing latency for read-heavy workloads. Read replicas asynchronously replicate data from the primary using MySQL or PostgreSQL native replication, allowing queries to be distributed across multiple instances. This directly addresses the high latency by scaling read capacity horizontally without impacting write performance.
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.
✗
Switch to a higher machine type.
Why it's wrong here
More powerful machine may improve performance but is often more expensive than using replicas.
✗
Enable automatic storage increase.
Why it's wrong here
Storage increase prevents out-of-space issues but does not improve query latency.
✗
Use connection pooling.
Why it's wrong here
Connection pooling reduces client-side connection overhead but does not reduce database read latency.
✓
Add read replicas.
Why this is correct
Read replicas serve read traffic, reducing load on primary and improving read latency.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that vertical scaling (higher machine type) is the universal fix for performance issues, but the trap here is that read-heavy workloads require horizontal scaling via read replicas to distribute the read load, not just a more powerful single instance.
Detailed technical explanation
How to think about this question
Cloud SQL read replicas use asynchronous replication based on the database engine's native binlog (MySQL) or WAL (PostgreSQL) streaming, which introduces a small replication lag (typically sub-second). For read-heavy workloads, applications can direct SELECT queries to the read replica's IP address or use a load balancer, while writes and critical reads remain on the primary. In a real-world scenario, a read-heavy e-commerce site might use multiple read replicas to handle product catalog queries, ensuring the primary instance remains responsive for order transactions.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this PCA question in full detail.
Analyze and optimize technical and business processes — This question tests Analyze and optimize technical and business processes — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Add read replicas. — Adding read replicas is the correct optimization because Cloud SQL read replicas offload read traffic from the primary instance, reducing latency for read-heavy workloads. Read replicas asynchronously replicate data from the primary using MySQL or PostgreSQL native replication, allowing queries to be distributed across multiple instances. This directly addresses the high latency by scaling read capacity horizontally without impacting write performance.
What should I do if I get this PCA 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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Question Discussion
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