dynamodb

# AWS DynamoDB Amazon DynamoDB is a fully managed NoSQL database service providing fast, predictable performance at any scale. It supports key-value and document data structures. ## Table of Contents - [Core Concepts](#core-concepts) - [Common Patterns](#common-patterns) - [CLI Reference](#cli-reference) - [Best Practices](#best-practices) - [Troubleshooting](#troubleshooting) - [References](#references) ## Core Concepts ### Keys | Key Type | Description | |----------|-------------| | **Partition Key (PK)** | Required. Determines data distribution | | **Sort Key (SK)** | Optional. Enables range queries within partition | | **Composite Key** | PK + SK combination | ### Secondary Indexes | Index Type | Description | |------------|-------------| | **GSI (Global Secondary Index)** | Different PK/SK, separate throughput, eventually consistent | | **LSI (Local Secondary Index)** | Same PK, different SK, shares table throughput, strongly consistent option | ### Capacity Modes | Mode | Use Case | |------|----------| | **On-Demand** | Unpredictable traffic, pay-per-request | | **Provisioned** | Predictable traffic, lower cost, can use auto-scaling | ## Common Patterns ### Create a Table **AWS CLI:** ```bash aws dynamodb create-table \ --table-name Users \ --attribute-definitions \ AttributeName=PK,AttributeType=S \ AttributeName=SK,AttributeType=S \ --key-schema \ AttributeName=PK,KeyType=HASH \ AttributeName=SK,KeyType=RANGE \ --billing-mode PAY_...