- A
Cloud SQL Enterprise Plus with db-perf-optimized-48-300
Why wrong: Enterprise Plus uses different tier naming and may have different limits; also the RAM is 300 GB, slightly less than required.
- B
Cloud SQL Enterprise with db-custom-48-307200
db-custom-48-307200 provides 48 vCPU and 307200 MB (300 GB) RAM, which is close to 312 GB. Cloud SQL Enterprise supports up to 96 vCPU and 624 GB RAM.
- C
Cloud SQL Enterprise with db-custom-32-204800
Why wrong: This provides only 32 vCPU and 200 GB RAM, insufficient.
- D
Cloud SQL Enterprise Plus with db-perf-optimized-64-400
Why wrong: Over-provisioned and Enterprise Plus might not be necessary; also the requirement is 48 vCPU.
Question 691 of 980
Design Scalable and Highly Available Cloud Database Solutions →mediumMultiple ChoiceObjective-mapped
PCD Practice Question: Design Scalable and Highly Available Cloud Database Solutions
This PCD practice question tests your understanding of design scalable and highly available cloud database solutions. 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 is migrating an on-premises MySQL OLTP application to Cloud SQL. The application requires 48 vCPU, 312 GB RAM, and 30 TB of storage. Which Cloud SQL edition and 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
✓
Cloud SQL Enterprise with db-custom-48-307200
Option B is correct because the application requires 48 vCPU and 312 GB RAM, and Cloud SQL Enterprise with db-custom-48-307200 provides exactly 48 vCPU and 307200 MB (300 GB) of RAM, which is the closest available tier that meets or exceeds the memory requirement. Cloud SQL Enterprise supports custom machine types with up to 48 vCPU and 307200 MB RAM, while Enterprise Plus offers only predefined 'perf-optimized' tiers that do not match the exact vCPU/RAM combination needed.
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.
- ✗
Cloud SQL Enterprise Plus with db-perf-optimized-48-300
Why it's wrong here
Enterprise Plus uses different tier naming and may have different limits; also the RAM is 300 GB, slightly less than required.
- ✓
Cloud SQL Enterprise with db-custom-48-307200
Why this is correct
db-custom-48-307200 provides 48 vCPU and 307200 MB (300 GB) RAM, which is close to 312 GB. Cloud SQL Enterprise supports up to 96 vCPU and 624 GB RAM.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Cloud SQL Enterprise with db-custom-32-204800
Why it's wrong here
This provides only 32 vCPU and 200 GB RAM, insufficient.
- ✗
Cloud SQL Enterprise Plus with db-perf-optimized-64-400
Why it's wrong here
Over-provisioned and Enterprise Plus might not be necessary; also the requirement is 48 vCPU.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume Enterprise Plus is always better, but the question tests whether you recognize that custom machine types (db-custom) in Cloud SQL Enterprise can precisely match specific vCPU and memory requirements, while Enterprise Plus only offers predefined perf-optimized tiers that may not align with exact needs.
Detailed technical explanation
How to think about this question
Cloud SQL custom machine types (db-custom) allow you to specify vCPU and memory independently, with memory ranging from 0.9 GB to 6.5 GB per vCPU, and a maximum of 48 vCPU and 307200 MB RAM in the Enterprise edition. The required 312 GB RAM is slightly above the 300 GB limit of the db-perf-optimized-48-300 tier, but the custom tier db-custom-48-307200 provides 300 GB, which is the maximum available; in practice, the application must be designed to work within this limit, or the storage and memory must be adjusted. The Enterprise Plus edition offers higher availability and performance but only with predefined tiers, not custom configurations, making it unsuitable for exact resource matching.
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.
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FAQ
Questions learners often ask
What does this PCD question test?
Design Scalable and Highly Available Cloud Database Solutions — This question tests Design Scalable and Highly Available Cloud Database Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Cloud SQL Enterprise with db-custom-48-307200 — Option B is correct because the application requires 48 vCPU and 312 GB RAM, and Cloud SQL Enterprise with db-custom-48-307200 provides exactly 48 vCPU and 307200 MB (300 GB) of RAM, which is the closest available tier that meets or exceeds the memory requirement. Cloud SQL Enterprise supports custom machine types with up to 48 vCPU and 307200 MB RAM, while Enterprise Plus offers only predefined 'perf-optimized' tiers that do not match the exact vCPU/RAM combination needed.
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.
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 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.
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