DBS-C01 Workload-Specific Database Design Practice Question
Which TWO AWS services can be used to cache database query results to improve read performance? (Select TWO.)
⚠ Common exam trap
Many exam-takers confuse read replicas with caching, but read replicas are full database copies that still execute queries, whereas ElastiCache stores pre-computed results in memory for near-instant retrieval.
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
✓
Amazon ElastiCache for Redis
Amazon ElastiCache for Redis and Amazon ElastiCache for Memcached are in-memory caching services that can store the results of database queries, allowing subsequent identical queries to be served from the cache instead of hitting the database. This reduces latency and improves read performance by offloading read traffic from the primary database.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Amazon DynamoDB Accelerator (DAX)
Why it's wrong here
Only for DynamoDB, not for general databases.
- ✓
Amazon ElastiCache for Redis
Why this is correct
In-memory cache for query results.
- ✗
Amazon CloudFront
Why it's wrong here
CDN, not for database caching.
- ✓
Amazon ElastiCache for Memcached
Why this is correct
In-memory caching service.
- ✗
Amazon RDS read replica
Why it's wrong here
Replica, not cache.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This DBS-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 DBS-C01 exam.