sqs

1# AWS SQS
2 
3Amazon Simple Queue Service (SQS) is a fully managed message queuing service for decoupling and scaling microservices, distributed systems, and serverless applications.
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### Queue Types
17 
18| Type | Description | Use Case |
19|------|-------------|----------|
20| **Standard** | At-least-once, best-effort ordering | High throughput |
21| **FIFO** | Exactly-once, strict ordering | Order-sensitive processing |
22 
23### Key Settings
24 
25| Setting | Description | Default |
26|---------|-------------|---------|
27| **Visibility Timeout** | Time message is hidden after receive | 30 seconds |
28| **Message Retention** | How long messages are kept | 4 days (max 14) |
29| **Delay Seconds** | Delay before message is available | 0 |
30| **Max Message Size** | Maximum message size | 256 KB |
31 
32### Dead-Letter Queue (DLQ)
33 
34Queue for messages that failed processing after maxReceiveCount attempts.
35 
36## Common Patterns
37 
38### Create a Standard Queue
39 
40**AWS CLI:**
41 
42```bash
43aws sqs create-queue \
44  --queue-name my-queue \
45  --attributes '{
46    "VisibilityTimeout": "60",
47    "MessageRetentionPeriod": "604800",
48    "ReceiveMessageWaitTimeSeconds": "20"
49  }'
50```
51 
52**boto3:**
53 
54```python
55import boto3
56 
57sqs = boto3.client('sqs')
58 
59response = sqs.create_queue(
60…