Objective 3.4
CLF-C02Identify AWS database services.
Objective 3.4 sits in Cloud Technology and Services, which carries 34% of the Cloud Practitioner exam. The questions below are original, written from the official objective title above, and each explanation cites the Amazon Web Services (AWS) page it rests on.
Objective title verbatim from the official objectives. Amazon Web Services (AWS) exam page ↗
A worked example
Shown solved, with the whole explanation open: this is what every question here carries.
A shopping cart needs single-digit millisecond reads at any scale, with no servers to patch and no capacity to provision. Which database fits?
Correct.
Checked against docs.aws.amazon.com, August 2026Concept
Choosing a data store starts with the access pattern, not the feature list. Predictable lookups by key at high volume and rich ad hoc querying pull toward different engines and different operating models.
Why C
A serverless NoSQL store answers key-based lookups in the same few milliseconds whether ten people or a hundred million are using it, with no instances, versions or maintenance windows in the picture.
Source
AWS Docs: What is Amazon DynamoDB, checked August 2026Amazon DynamoDB is a serverless, fully managed, distributed NoSQL database with single-digit millisecond performance at any scale. DynamoDB addresses your needs to overcome scaling and operational complexities of relational databases. DynamoDB is purpose-built and optimized for operational workloads that require consistent performance at any scale. For example, DynamoDB delivers consistent single-digit millisecond performance for a shopping cart use case…
Now you: objective 3.4 questions
No account needed. The explanation opens when you answer.
Sample question 1 of 3
A team moves a PostgreSQL database from EC2 to Amazon RDS. Which task stops being theirs after the move?
Sample question 2 of 3
A team weighs Aurora against RDS for PostgreSQL for a database that keeps growing. How does Aurora handle the storage volume?
Sample question 3 of 3
A reporting feature joins five normalized tables and runs ad hoc SQL. Why is DynamoDB the wrong choice for it?
That’s 3 of the full Cloud Practitioner bank.
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Continue practicingRead the sources
These are the official pages the questions above cite. Reading them is studying the objective from the primary source, which is what the explanations point you toward anyway.
More objectives in Cloud Technology and Services
- 3.1 Define methods of deploying and operating in the AWS Cloud.
- 3.2 Define the AWS global infrastructure.
- 3.3 Identify AWS compute services.
- 3.5 Identify AWS network services.
- 3.6 Identify AWS storage services.
- 3.7 Identify AWS artificial intelligence and machine learning (AI/ML) services and analytics services.
- 3.8 Identify services from other in-scope AWS service categories.