Amazon DynamoDB is a fast, flexible NoSQL database service for apps that need consistent, single-digit millisecond latency at any scale. Learn how this key-value and document database works and scales.
Table of Contents
Question
Which description best defines Amazon DynamoDB?
A. A key-value and document database that scales horizontally and works well for internet-scale applications
B. A relational database that is built for the cloud and is compatible with MySQL and PostgreSQL
C. A graph database engine that is optimized for storing billions of relationships
D. An in-memory data store that can boost the performance of databases.
Answer
A. A key-value and document database that scales horizontally and works well for internet-scale applications
Explanation
Amazon DynamoDB is a key-value and document database. It is a multi-Region, Multi-active, and durable database that delivers single-digit milisecond performance. It works well for internet-scale applications.
This is the correct answer. Amazon DynamoDB is a fully managed NoSQL database service that provides fast and predictable performance with seamless scalability. It is a key-value and document database, meaning it stores data as key-value pairs or as JSON-like documents.
Key features of DynamoDB include:
- Horizontal scalability – DynamoDB can scale out horizontally by adding more servers to handle increased traffic and data storage needs. It automatically spreads data and traffic across servers for high availability and performance.
- Single-digit millisecond latency – DynamoDB provides consistent sub-10 ms latency for read and write operations at any scale, making it suitable for real-time applications.
- Schema flexibility – As a NoSQL database, DynamoDB does not enforce a fixed schema. Each item can have its own attributes, allowing easy changes to data models over time.
- Fully managed – DynamoDB is a fully managed service, so there are no servers to provision, patch, or manage. Availability, fault tolerance, and backups are built-in.
DynamoDB is purpose-built for high-scale applications such as gaming, ad tech, mobile apps, and other workloads that require low latency data access. Its ability to scale seamlessly and provide fast, consistent performance make it well-suited for internet-scale use cases.
The other options are not accurate descriptions of DynamoDB:
- B refers to Amazon Aurora, a relational database compatible with MySQL/PostgreSQL
- C refers to Amazon Neptune, a graph database
- D refers to Amazon ElastiCache, an in-memory caching service
So in summary, A is the best description of the key-value, document-oriented, and horizontally scalable nature of DynamoDB. Let me know if you need any clarification or have additional questions!
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