dynamodb

1# AWS DynamoDB
2 
3Amazon DynamoDB is a fully managed NoSQL database service providing fast, predictable performance at any scale. It supports key-value and document data structures.
4 
5## Table of Contents
6 
7- [Core Concepts](#core-concepts)
8- [Common Patterns](#common-patterns)
9- [CLI Reference](#cli-reference)
10- [Best Practices](#best-practices)
11- [Troubleshooting](#troubleshooting)
12- [References](#references)
13 
14## Core Concepts
15 
16### Keys
17 
18| Key Type | Description |
19|----------|-------------|
20| **Partition Key (PK)** | Required. Determines data distribution |
21| **Sort Key (SK)** | Optional. Enables range queries within partition |
22| **Composite Key** | PK + SK combination |
23 
24### Secondary Indexes
25 
26| Index Type | Description |
27|------------|-------------|
28| **GSI (Global Secondary Index)** | Different PK/SK, separate throughput, eventually consistent |
29| **LSI (Local Secondary Index)** | Same PK, different SK, shares table throughput, strongly consistent option |
30 
31### Capacity Modes
32 
33| Mode | Use Case |
34|------|----------|
35| **On-Demand** | Unpredictable traffic, pay-per-request |
36| **Provisioned** | Predictable traffic, lower cost, can use auto-scaling |
37 
38## Common Patterns
39 
40### Create a Table
41 
42**AWS CLI:**
43 
44```bash
45aws dynamodb create-table \
46  --table-name Users \
47  --attribute-definitions \
48    AttributeName=PK,AttributeType=S \
49    AttributeName=SK,AttributeType=S \
50  --key-schema \
51    AttributeName=PK,KeyType=HASH \
52    AttributeName=SK,KeyType=RANGE \
53…