Which TWO combinations correctly match an AWS database or related service with its characteristics? (Choose TWO.)
A question asking to select the two correct pairings of DB/related service and characteristic.
Amazon Redshift — A key-value NoSQL database that responds in single-digit milliseconds.
The key-value NoSQL database that responds in single-digit milliseconds is Amazon DynamoDB.
Redshift is an analytics-oriented data warehouse; the description is incorrect, so this is incorrect.
Amazon DynamoDB — A serverless, auto-scaling key-value NoSQL database.
This is correct. DynamoDB is a fully managed, serverless, auto-scaling key-value/document NoSQL database.
Amazon ElastiCache — An in-memory cache that accelerates response times.
This is correct. ElastiCache is an in-memory cache (Redis/Memcached) that accelerates response times and reduces database load.
Amazon DynamoDB — An analytics data warehouse that performs complex table joins and aggregations.
The analytics data warehouse for complex aggregations is Amazon Redshift.
DynamoDB is a key-value NoSQL database; the description is incorrect, so this is incorrect.
Amazon Aurora — A cache-only service that holds data exclusively in memory.
The characteristic of holding data in memory for fast responses is Amazon ElastiCache.
Amazon Aurora is a relational database compatible with MySQL/PostgreSQL that persists data to storage; the characteristics have been swapped. This is incorrect.
Mappings: DynamoDB = key-value NoSQL / ElastiCache = in-memory cache / Redshift = analytics DWH / Neptune = graph DB / RDS & Aurora = relational. Distinguish by use case.