AWS AWS Database Services

Question 1

When should you choose Amazon DynamoDB over Amazon RDS?

Accepted Answer

For applications needing single-digit millisecond latency at any scale with flexible schema

Answer

DynamoDB is ideal for applications requiring consistent single-digit millisecond performance at any scale, flexible schemas, and key-value or document data models, while RDS suits traditional relational workloads with complex queries.

Question 2

What is Amazon Aurora and how does it differ from standard RDS?

Accepted Answer

A MySQL/PostgreSQL-compatible database with up to 5x and 3x better performance respectively and automatic storage scaling

Answer

Aurora is AWS's proprietary cloud-optimized relational database offering MySQL and PostgreSQL compatibility with superior performance, automatic storage scaling up to 128 TB, and up to 15 read replicas.

Question 3

What is Amazon ElastiCache and when should it be used?

Accepted Answer

A managed in-memory caching service (Redis or Memcached) for reducing database load and improving latency

Answer

ElastiCache provides managed Redis or Memcached in-memory caching, used to reduce database read load, store session data, cache API responses, and improve application latency for frequently accessed data.

Question 4

What is Amazon Redshift used for?

Accepted Answer

A fully managed data warehouse for analyzing large datasets using SQL

Answer

Amazon Redshift is a fully managed, petabyte-scale data warehouse that uses columnar storage, massively parallel processing, and SQL-based analytics for business intelligence and big data analytics workloads.

Question 5

What is Amazon DocumentDB?

Accepted Answer

A managed document database service compatible with MongoDB workloads

Answer

Amazon DocumentDB is a fully managed document database service designed for MongoDB compatibility, providing scalable, highly available document storage with automatic backups, encryption, and replication.

AWS Practice Test

AWS Practice Test

AWS AWS Database Services