The answer is to create a read replica of the current instance, upgrade the replica, and then promote it to primary. This approach minimizes downtime because the read replica can be upgraded to the new major version in the background while the original primary instance continues serving traffic; promotion is a fast metadata operation that typically redirects traffic in seconds, avoiding the extended outage required for an in-place upgrade or a full data migration. On the AWS Certified Data Engineer Associate DEA-C01 exam, this scenario tests your understanding of high-availability patterns for RDS PostgreSQL major version upgrade with minimal downtime, often appearing as a distractor against slower options like snapshot restore or manual pg_dump. A common trap is assuming an in-place upgrade is fastest, but the replica method decouples the upgrade process from production traffic. Memory tip: think “replica, upgrade, promote” as the three-step handoff—like a relay race where the baton never stops moving.
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 Amazon RDS for PostgreSQL and wants to minimize downtime during a major version upgrade. Which approach best meets this requirement?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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 current instance, upgrade the replica, and then promote it to primary.
Option C is correct because creating a read replica, upgrading it to the new major version, and then promoting it to primary minimizes downtime by allowing the replica to be upgraded while the original instance remains operational. The promotion process is fast, typically taking only a few seconds to redirect traffic, and avoids the longer downtime associated with in-place upgrades or full data migrations.
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.
✗
Perform an in-place upgrade using the AWS Management Console.
Why it's wrong here
In-place upgrades cause downtime during the process.
✗
Modify the DB instance class to a larger size to handle the upgrade.
Why it's wrong here
Changing instance class does not upgrade the major version.
✓
Create a read replica of the current instance, upgrade the replica, and then promote it to primary.
Why this is correct
This minimizes downtime by switching over after upgrade.
Clue confirmation
The clue words "best", "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use pg_dump and pg_restore to migrate data to a new upgraded instance.
Why it's wrong here
Manual dump and restore incurs significant downtime.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume an in-place upgrade (Option A) is the simplest and fastest method, but they overlook the fact that major version upgrades in RDS PostgreSQL require a longer downtime window due to the need for a database restart and potential compatibility checks, making the read replica promotion strategy the superior choice for minimizing downtime.
Detailed technical explanation
How to think about this question
Under the hood, RDS read replicas use PostgreSQL's native streaming replication to maintain an asynchronous copy of the primary database. When you upgrade the replica, RDS applies the new major version binaries while the replica is stopped, then re-establishes replication from the primary after the upgrade. Promoting the replica breaks the replication link and makes it a standalone primary; the promotion process is a metadata change that completes in seconds, as it does not require a full data copy. This approach is particularly effective for minimizing downtime in production environments where even a few minutes of outage can be costly.
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 current instance, upgrade the replica, and then promote it to primary. — Option C is correct because creating a read replica, upgrading it to the new major version, and then promoting it to primary minimizes downtime by allowing the replica to be upgraded while the original instance remains operational. The promotion process is fast, typically taking only a few seconds to redirect traffic, and avoids the longer downtime associated with in-place upgrades or full data migrations.
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: "best", "minimum / minimize". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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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