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Redis Essentials

Complete guide to Redis in-memory data store - caching, data structures, pub/sub, persistence, and cluster management

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Installation & Basics

Getting started with Redis

Installation & Setup

Installing Redis on different platforms

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⚡ In-memory data store for high performance
📦 Available in most package managers
🔧 Default port 6379
💾 Optional persistence with AOF/RDB

Basic Commands

Essential Redis commands and operations

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🔑 All operations on keys are atomic
⚡ O(1) complexity for most operations
🔍 Use SCAN instead of KEYS in production
💾 Transactions with MULTI/EXEC

Data Structures

Redis data types and their operations

Lists

Ordered collections of strings

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📝 Doubly-linked lists for fast push/pop
🔄 O(1) for head/tail operations
📊 Great for queues and stacks
⏰ Blocking operations for queue patterns

Sets

Unordered collections of unique strings

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🎯 Guarantees unique members
⚡ O(1) add, remove, and check
🔄 Powerful set operations (union, intersection)
🎲 Random member selection support

Sorted Sets

Ordered sets with scores

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📊 Members ordered by score
🏆 Perfect for leaderboards and rankings
⚡ O(log(N)) for most operations
🔢 Floating point scores for precision

Hashes

Field-value pairs (like objects)

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🗂️ Perfect for storing objects/records
⚡ O(1) for single field operations
💾 More memory efficient than JSON strings
🔍 Can fetch specific fields without entire object

Pub/Sub & Streams

Messaging patterns and stream processing

Pub/Sub Messaging

Publish/Subscribe messaging pattern

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📡 Real-time messaging between clients
🔥 Fire-and-forget delivery (no persistence)
🎯 Pattern matching for flexible subscriptions
⚠️ Messages lost if no active subscribers

Streams

Persistent message streams with consumer groups

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💾 Persistent message history
👥 Consumer groups for distributed processing
✅ Message acknowledgment support
📊 Better than pub/sub for reliable messaging

Persistence & Backup

Data persistence and backup strategies

Persistence Options

RDB snapshots and AOF logging

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💾 RDB for periodic snapshots
📝 AOF for write durability
🔄 Hybrid mode combines both benefits
⚡ Choose based on durability vs performance needs

Performance & Optimization

Optimizing Redis for better performance

Memory Optimization

Memory management and optimization techniques

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💾 Choose correct eviction policy
📊 Use appropriate data structures
🗜️ Enable compression for large values
⏱️ Set TTL to auto-clean old data

Performance Tuning

Optimizing Redis performance

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🚀 Pipeline commands to reduce latency
📊 Monitor slow queries regularly
⚙️ Tune OS settings for production
📈 Use redis-benchmark for testing

Clustering & Replication

Scaling Redis with replication and clustering

Replication & Clustering

Master-slave replication and Redis Cluster

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📋 Replication for read scaling and backup
🔰 Sentinel for automatic failover
🎯 Cluster for horizontal scaling
⚠️ Use hash tags for multi-key operations in cluster