This PCA practice question tests your understanding of ensure solution and operations reliability. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 uses Cloud SQL for PostgreSQL. They want to minimize downtime during maintenance. Which feature should they enable?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Read replicas.
Why wrong: Read replicas don't failover automatically.
High availability with a standby in another zone.
Provides automatic failover.
Point-in-time recovery.
Why wrong: For data recovery, not downtime.
Automated backups.
Why wrong: Do not reduce downtime.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
High availability with a standby in another zone.
High availability (HA) with a standby in another zone ensures that Cloud SQL for PostgreSQL automatically fails over to a standby instance in a different zone if the primary zone experiences an outage. This minimizes downtime during maintenance because Cloud SQL performs a controlled failover to the standby, typically completing within a few seconds, rather than requiring a full instance restart or rebuild.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Read replicas.
Why it's wrong here
Read replicas don't failover automatically.
High availability with a standby in another zone.
Why this is correct
Provides automatic failover.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Point-in-time recovery.
Why it's wrong here
For data recovery, not downtime.
Automated backups.
Why it's wrong here
Do not reduce downtime.
Common exam traps
The trap here is that candidates often confuse read replicas with high availability, assuming read replicas can automatically take over for the primary, but read replicas require manual promotion and do not provide automatic failover, making HA with a standby the correct choice for minimizing downtime during maintenance.
Detailed technical explanation
Cloud SQL HA uses synchronous replication to a standby instance in a different zone within the same region, ensuring zero data loss during failover. During maintenance, Cloud SQL performs a graceful failover by draining connections, flushing writes, and promoting the standby, typically completing in under 60 seconds. A subtle behavior is that the standby is not directly accessible for reads; it only becomes the primary after failover, unlike read replicas which serve read traffic.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Ensure solution and operations reliability — This question tests Ensure solution and operations reliability — Read the scenario before looking for a memorised answer..
The correct answer is: High availability with a standby in another zone. — High availability (HA) with a standby in another zone ensures that Cloud SQL for PostgreSQL automatically fails over to a standby instance in a different zone if the primary zone experiences an outage. This minimizes downtime during maintenance because Cloud SQL performs a controlled failover to the standby, typically completing within a few seconds, rather than requiring a full instance restart or rebuild.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
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