DEA-C01 Data Store Management Practice Question
A company runs an Amazon RDS for MySQL database. The database experiences high write latency during peak hours. The data engineer notices that the WriteIOPS metric is consistently at the provisioned limit. Which action would most effectively reduce write latency without increasing costs?
⚠ Common exam trap
A common mix-up: candidates assume increasing provisioned IOPS (Option B) is the only way to fix write latency, overlooking that Aurora’s pay-per-request I/O model can provide higher throughput without a fixed cost increase, and that Multi-AZ (Option A) is a common distractor because it sounds like it improves performance but actually targets availability.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Migrate to Amazon Aurora MySQL with appropriate instance size
Migrating to Amazon Aurora MySQL with an appropriate instance size reduces write latency because Aurora’s distributed storage architecture provides up to 20 times the write throughput of standard MySQL on RDS, without requiring additional IOPS provisioning. Aurora automatically scales storage I/O and uses a 6-replica quorum-based write model, which eliminates the bottleneck of hitting a fixed IOPS limit while keeping costs comparable to or lower than provisioned IOPS on RDS.
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 Multi-AZ deployment
Why it's wrong here
Multi-AZ provides high availability but does not improve write throughput.
- ✗
Increase the provisioned IOPS on the existing RDS instance
Why it's wrong here
This increases cost and may not be efficient if the bottleneck is elsewhere.
- ✗
Add a read replica to offload read traffic
Why it's wrong here
Read replicas handle only read queries, not writes.
- ✓
Migrate to Amazon Aurora MySQL with appropriate instance size
Why this is correct
Aurora's distributed storage can handle higher write throughput with lower latency and cost.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This DEA-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DEA-C01 exam.