DynamoDB

What it is: A fully managed NoSQL key-value and document database.

What it’s for:

• Low-latency workloads at any scale.
• Serverless applications (no servers to manage).
• Event-driven patterns with Streams.

Key ideas:

• Data model uses:
  • Partition Key
  • Sort Key (optional)
• Scaling:
  • On-demand or provisioned capacity (exam topic).
• Secondary indexes:
  • GSI
  • LSI
• Change capture:
  • DynamoDB Streams

Exam cues:

• “single-digit millisecond latency at scale” → DynamoDB.
• “serverless NoSQL” → DynamoDB.

Hard words:

• *NoSQL* /ˌnoʊ ɛs kjuː ˈel/: không phải SQL
• *key-value* /ˈkiː ˌvæljuː/: khóa-giá trị
• *document* /ˈdɑːkjumənt/: tài liệu (JSON-like)
• *provisioned* /prəˈvɪʒənd/: cấp sẵn (tài nguyên)