The answer is to create a read replica of the DB instance, upgrade the replica, and then promote it to the primary instance. This approach minimizes downtime during an RDS major version upgrade by keeping the original primary fully operational while the replica is upgraded in the background; the only interruption is a brief cutover period—typically seconds—when applications switch to the promoted replica, leveraging RDS’s managed asynchronous replication to avoid the longer outage of a direct in-place upgrade. On the AWS Certified Data Engineer Associate DEA-C01 exam, this scenario tests your understanding of high-availability patterns and the trade-offs between replication-based upgrades and standard modification operations, with a common trap being to choose a snapshot restore or in-place upgrade that incurs significant downtime. Remember the memory tip: “Replica first, promote fast”—the key is that the replica absorbs the upgrade work, so the primary never goes dark until the final, swift cutover.
DEA-C01 Data Store Management Practice Question
This DEA-C01 practice question tests your understanding of data store management. 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 using an RDS for PostgreSQL instance and wants to minimize downtime during a major version upgrade. Which approach should be taken?
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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a read replica of the DB instance, upgrade the replica, and then promote it to the primary instance.
Option A is correct because creating a read replica of the RDS for PostgreSQL instance, upgrading the replica to the new major version, and then promoting it to become the primary instance minimizes downtime by allowing the replica to be upgraded while the original primary remains fully operational. The promotion process is fast (typically seconds), and the only downtime is the brief cutover period when applications switch to the promoted replica. This approach leverages RDS's managed replication and avoids the longer downtime associated with direct in-place upgrades.
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.
✓
Create a read replica of the DB instance, upgrade the replica, and then promote it to the primary instance.
Why this is correct
Minimizes downtime by failing over to the upgraded replica.
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.
✗
Use AWS Database Migration Service (DMS) to migrate data to a new upgraded instance.
Why it's wrong here
DMS is for migrations, not for minimizing upgrade downtime in the same instance.
✗
Modify the DB instance and apply the upgrade immediately.
Why it's wrong here
This causes downtime during the upgrade.
✗
Take a snapshot of the DB instance and restore it as a new instance with the upgraded version.
Why it's wrong here
Restoring from snapshot takes time and causes downtime.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume a snapshot-and-restore (Option D) is the fastest method because it seems like a simple copy, but they overlook the fact that the snapshot itself requires the instance to be operational and the restore creates a new instance that is not automatically kept in sync, leading to longer overall downtime compared to the replica promotion method.
Detailed technical explanation
How to think about this question
Under the hood, RDS for PostgreSQL read replicas use PostgreSQL's native streaming replication (WAL-based) to stay in sync with the primary. When you upgrade the replica's major version, RDS performs the upgrade on the replica independently, and the replica continues to apply WAL changes from the primary until the moment of promotion. The promotion process breaks the replication link and makes the replica a standalone primary; the entire cutover can be completed in under a minute if the application's connection string is updated quickly. In real-world scenarios, this approach is especially valuable for production databases where even a few minutes of downtime can impact SLAs or cause user-facing errors.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Data Store Management — This question tests Data Store Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create a read replica of the DB instance, upgrade the replica, and then promote it to the primary instance. — Option A is correct because creating a read replica of the RDS for PostgreSQL instance, upgrading the replica to the new major version, and then promoting it to become the primary instance minimizes downtime by allowing the replica to be upgraded while the original primary remains fully operational. The promotion process is fast (typically seconds), and the only downtime is the brief cutover period when applications switch to the promoted replica. This approach leverages RDS's managed replication and avoids the longer downtime associated with direct in-place upgrades.
What should I do if I get this DEA-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
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.
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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