====== 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:
    * [[aws:database:dynamodb:partition-key|Partition Key]]
    * [[aws:database:dynamodb:sort-key|Sort Key]] (optional)
  * Scaling:
    * On-demand or provisioned capacity (exam topic).
  * Secondary indexes:
    * [[aws:database:dynamodb:gsi|GSI]]
    * [[aws:database:dynamodb:lsi|LSI]]
  * Change capture:
    * [[aws:database:dynamodb:streams|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)