DBS-C01 Workload-Specific Database Design Practice Question
A company is building a document management system where each document can have multiple attributes (tags) that need to be queried efficiently. The workload is write-heavy with occasional reads. Which database is best suited?
⚠ Common exam trap
AWS often tests the misconception that a ledger database (QLDB) is suitable for general-purpose document storage because of its 'immutable' and 'verifiable' features, but candidates overlook that QLDB is not designed for high write throughput or flexible attribute queries, which DynamoDB handles natively.
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 DynamoDB
Amazon DynamoDB is the best choice for a write-heavy, document management system with tag-based queries because it is a fully managed NoSQL key-value and document database that delivers single-digit millisecond performance at any scale. Its flexible schema allows each document to have multiple attributes (tags) without predefined schemas, and its secondary indexes (LSI/GSI) enable efficient querying on those tags. DynamoDB's auto-scaling and provisioned throughput are designed to handle high write volumes, while occasional reads benefit from its consistent low-latency access.
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 QLDB
Why it's wrong here
QLDB is a ledger database for immutable transactions, not for document management.
- ✓
Amazon DynamoDB
Why this is correct
DynamoDB allows flexible attributes and global secondary indexes for efficient queries.
- ✗
Amazon ElastiCache for Redis
Why it's wrong here
ElastiCache is an in-memory cache, not designed for durable document storage.
- ✗
Amazon RDS for MySQL
Why it's wrong here
RDS requires predefined schema, making it less flexible for dynamic attributes.
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Written by Johnson Ajibi, MSc IT Security
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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.