The correct answer is to set up logical replication using pglogical or native publication/subscription. This works because logical replication decodes the write-ahead log (WAL) to capture row-level changes—INSERT, UPDATE, and DELETE—and can include both the old and new values of updated rows, providing the before-and-after images required for audit logging. On the AWS Certified Data Engineer Associate DEA-C01 exam, this scenario tests your understanding of how to meet compliance-driven audit requirements in Amazon RDS for PostgreSQL, often appearing as a trap where candidates mistakenly choose triggers or native audit extensions like pgAudit, which log statements but not row-level before-and-after images. Remember the key distinction: logical replication gives you the full row snapshot, while pgAudit only logs the SQL text. A helpful memory tip is “Logical for Logging Row-Level,” linking logical replication directly to the row-level change data needed for audit trails.
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 financial services company stores transaction data in Amazon RDS for PostgreSQL. The company requires that all changes to the database be logged for audit purposes, including before and after images of updated rows. Which feature should the data engineer enable?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Set up logical replication using pglogical or native publication/subscription
Option C is correct because logical replication, using either pglogical or native PostgreSQL publication/subscription, captures row-level changes (INSERT, UPDATE, DELETE) and can include both the old and new values of updated rows. This meets the audit requirement for before-and-after images, as logical replication decodes the write-ahead log (WAL) to produce a change stream that includes full row snapshots.
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.
✗
Enable automated backups and export logs to Amazon S3
Why it's wrong here
Backups capture point-in-time snapshots, not incremental changes with before/after images.
✗
Enable Enhanced Monitoring and publish logs to CloudWatch Logs
Why it's wrong here
Enhanced Monitoring captures OS metrics, not data changes.
✓
Set up logical replication using pglogical or native publication/subscription
Why this is correct
Logical replication provides row-level changes with before and after images.
Related concept
Read the scenario before looking for a memorised answer.
✗
Enable Multi-AZ deployment and read replicas
Why it's wrong here
Multi-AZ provides failover, not change capture.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse database-level logging features (like Enhanced Monitoring or automated backups) with row-level change data capture, assuming any logging mechanism will capture before-and-after images, when only logical replication (or triggers with audit tables) provides that granularity.
Detailed technical explanation
How to think about this question
Logical replication works by decoding WAL records into a logical change set using a plugin like pgoutput (native) or pglogical; the publisher sends these changes to a subscriber, which applies them. For UPDATE operations, the replication slot can be configured to include both old and new tuple data by setting 'include-xids' or using the 'REPLICA IDENTITY FULL' option on the table, ensuring full before-and-after images are captured. In a real-world audit scenario, this enables reconstructing the exact state of a row before and after a modification, which is critical for compliance with regulations like SOX or PCI-DSS.
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.
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: Set up logical replication using pglogical or native publication/subscription — Option C is correct because logical replication, using either pglogical or native PostgreSQL publication/subscription, captures row-level changes (INSERT, UPDATE, DELETE) and can include both the old and new values of updated rows. This meets the audit requirement for before-and-after images, as logical replication decodes the write-ahead log (WAL) to produce a change stream that includes full row snapshots.
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.
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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