Which of the following are use cases for Amazon DynamoDB? (Choose three)
A.
Storing BLOB data.
B.
Managing web sessions.
C.
Storing JSON documents.
D.
Storing metadata for Amazon S3 objects.
E.
Running relational joins and complex updates.
F.
Storing large amounts of infrequently accessed data.
Explanation:
Ideal Usage Patterns
•Amazon DynamoDB is ideal for existing or new applications that need a flexible NoSQL database with low
read and write latencies, and the ability to scale storage and throughput up or down as needed without code
changes or downtime.
•Use cases require a highly available and scalable database because downtime or performance degradation
has an immediate negative impact on an organization’s business. for e.g. mobile apps, gaming, digital ad
serving, live voting and audience interaction for live events, sensor networks, log ingestion, access control for
web-based content, metadata storage for Amazon S3 objects, e-commerce shopping carts, and web session
management
B C D
Why not E ?
Not E b/c https://aws.amazon.com/dynamodb/faqs/ – do ctrl+f for joins…
BCD is correct
You cannot do complex joins in DynamoDB and it is not for storing infrequently accessed data. I would throw blob data in S3. That leaves the other 3.
Running relational joins and complex updates. this is the feature of RDS not DynomoDB
In https://aws.amazon.com/dynamodb/faqs/ it is mentioned
Amazon S3 stores unstructured ‘blobs’ and suited for storing large objects up to 5 TB. In order to optimize your costs across AWS services, large objects or ‘infrequently accessed data sets’ should be stored in Amazon S3
The above covers for F & A and finally Json is supported. therefore the answers are ->
A, C, F
Managing web sessions
Storing JSON documents
Storing metadata for Amazon S3 objects