Quick Answer
The answer is Multi-AZ RDS for PostgreSQL with synchronous standby replication, as this configuration meets the strict RPO of 1 second and RTO of 5 minutes at the lowest cost. The synchronous standby ensures zero data loss during failover by committing writes to both the primary and standby in a different Availability Zone before acknowledging the transaction, which satisfies the 1-second RPO for point-in-time recovery, while the automatic failover typically completes in 1–2 minutes, well within the 5-minute RTO. On the AWS Certified Database Specialty DBS-C01 exam, this scenario tests your understanding that Multi-AZ with synchronous replication is the cost-effective high availability solution for financial applications requiring near-zero data loss, as opposed to a Multi-AZ cluster or cross-Region replication, which would be overkill and more expensive. A common trap is assuming asynchronous replication meets a 1-second RPO—it does not, because asynchronous standby can lag. Memory tip: “Sync for zero, async for lag” helps you remember that synchronous replication is required when every second of data matters.
This DBS-C01 practice question tests your understanding of workload-specific database design. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 runs a financial application on Amazon RDS for PostgreSQL that requires point-in-time recovery (PITR) with a recovery point objective (RPO) of 1 second and recovery time objective (RTO) of 5 minutes. Which configuration meets these requirements at the lowest cost?
Multi-AZ RDS with synchronous standby.
Automatic failover within minutes, minimal data loss.
Single-AZ RDS with automated backups and manual snapshot restore.
Why wrong: Manual restore exceeds RTO.
Single-AZ RDS with a read replica and promote on failure.
Why wrong: Promotion is manual and slower.
Single-AZ RDS with cross-region snapshot copy.
Why wrong: Does not meet RTO.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Multi-AZ RDS with synchronous standby.
Multi-AZ RDS for PostgreSQL with synchronous standby replication provides automatic failover to a standby in a different Availability Zone, enabling an RTO of typically 1–2 minutes, well within the 5-minute requirement. Automated backups and transaction logs allow PITR with an RPO of 1 second by restoring to any point within the retention period, and the synchronous standby ensures zero data loss during failover, meeting the strict RPO at the lowest cost for this high-availability need.
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.
Multi-AZ RDS with synchronous standby.
Why this is correct
Automatic failover within minutes, minimal data loss.
Related concept
Read the scenario before looking for a memorised answer.
Single-AZ RDS with automated backups and manual snapshot restore.
Why it's wrong here
Manual restore exceeds RTO.
Single-AZ RDS with a read replica and promote on failure.
Why it's wrong here
Promotion is manual and slower.
Single-AZ RDS with cross-region snapshot copy.
Why it's wrong here
Does not meet RTO.
Common exam traps
The trap here is that candidates often assume a read replica can provide fast failover and low RPO, but they overlook that read replicas use asynchronous replication, which introduces lag and requires manual promotion, failing both the RPO and RTO requirements.
Detailed technical explanation
In Multi-AZ RDS for PostgreSQL, synchronous replication is implemented using PostgreSQL's streaming replication with synchronous_commit set to 'on' or 'remote_write', ensuring that transactions are committed on both the primary and standby before acknowledging the client. The failover process is automated by AWS, which detects primary failure and promotes the standby within 60–120 seconds, while automated backups capture transaction logs every 5 minutes, enabling PITR to any second within the retention window. For financial applications, this configuration balances cost and performance because Multi-AZ incurs only the cost of the standby instance and storage, avoiding the higher expense of a full cross-region setup or the complexity of custom replication solutions.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
What to study next
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FAQ
Workload-Specific Database Design — This question tests Workload-Specific Database Design — Read the scenario before looking for a memorised answer..
The correct answer is: Multi-AZ RDS with synchronous standby. — Multi-AZ RDS for PostgreSQL with synchronous standby replication provides automatic failover to a standby in a different Availability Zone, enabling an RTO of typically 1–2 minutes, well within the 5-minute requirement. Automated backups and transaction logs allow PITR with an RPO of 1 second by restoring to any point within the retention period, and the synchronous standby ensures zero data loss during failover, meeting the strict RPO at the lowest cost for this high-availability need.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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