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---
title: "Amazon DynamoDB"
type: entity
tags: [AWS, Database, NoSQL, Key-Value, Document]
date: 2026-04-18
---
## Definition
Amazon DynamoDB 是 AWS 提供的全托管键值和文档数据库,提供单数字毫秒级延迟,支持每日数万亿请求。
## Key Characteristics
- 类型:键值存储 + 文档数据库
- 延迟:单数字毫秒级别
- 规模:支持每日数万亿请求
- 模式:灵活模式,无需预定义 schema
- 备份:自动备份和点时间恢复
## Use Cases
- 物联网数据存储
- 游戏玩家数据
- 电子商务购物车
- 个性化推荐
## Sources
- [[ctp-topic-51-architecting-with-aws-purpose-built-databases]]
## Case Studies
- Duolingo使用 DynamoDB 存储个性化用户数据
- Netflix使用 DynamoDB 实现弹性和低延迟 JSON 文档访问