Wiki Article · Cinematic

Cache Eviction

Yeh article cache eviction ka complete guide hai — woh process jisme cache full hone pe purani ya…

Overview

Cache Eviction — Quick Facts

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Property: Detail

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Topic: Cache Eviction

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Also Known As: Cache replacement, cache expiry,…

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Category: Performance / Caching / Scalability

Topic 1

Infobox

📚 | Property | Detail | |---|---| | Topic | Cache Eviction | | Also Known As | Cache…

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What Is Cache Eviction?

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LRU: Jo kitaab sabse lambe time se…

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LFU: Jo kitaab sabse kam baar…

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FIFO: Jo kitaab sabse pehle rakhi…

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Random: Koi bhi random hatao

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Why Eviction Is Needed

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Cache badhta jayega → memory…

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Redis: maxmemory set nahi kiya →…

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Browser: quota exceed → browser…

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CPU: cache fixed size hai →…

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Eviction Policies Overview

⭐ | Policy | Full Name | How It Decides | Complexity | Best For | |---|---|---|---|---| |…

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LRU — Least Recently Used

🔑 Concept LRU sabse popular eviction policy hai: jo item sabse lambe time se access nahi…

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LFU — Least Frequently Used

✨ Concept LFU = jo item sabse kam baar access hua → woh hatao. Frequency-based decision.…

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FIFO — First In First Out

🌟 Concept FIFO = jo item sabse pehle cache me aaya → woh pehle evict. How It Works 1. Items…

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TTL — Time-to-Live Based

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Lazy: Key access pe TTL check →…

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Active: Har 100ms me random 20…

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Random Eviction

📚 Concept Random = koi bhi random item evict karo. No access tracking, no ordering. When…

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ARC — Adaptive Replacement Cache

💡 Concept ARC = self-tuning algorithm jo LRU + LFU ka balance automatically adjust karta…

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Clock / Second-Chance

🎯 Concept Clock algorithm = LRU ka approximate — OS virtual memory page replacement me use…

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Other Policies (LRU-K, SLRU, 2Q, TLRU)

⭐ | Policy | Description | Best For | |---|---|---| | LRU-K | Eviction based on K-th last…

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Policy Comparison

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Eviction in Redis

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Random sample of keys (default: 5)…

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In me se sabse purana (LRU clock…

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maxmemory-samples increase karne…

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Redis 4.0+ me LFU bhi available…

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Eviction in Memcached

🌟 Slab-Based LRU | Feature | Detail | |---|---| | Slab classes | Items size ke basis pe…

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Eviction in CDN

🚀 | Factor | How CDN Evicts | |---|---| | TTL | Origin server Cache-Control/Expires headers…

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Eviction in CPU Cache

📚 Set-Associative Cache | Term | Description | |---|---| | Set | Cache lines ka group…

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Eviction in OS (Page Replacement)

💡 Virtual Memory Context OS RAM pages ke liye eviction decide karta hai — RAM full hone pe…

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When to Use Which Policy

🎯 | Workload Type | Recommended Policy | Reason | |---|---|---| | General web app cache |…

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LRU Eviction Flow — Mermaid Diagram

⭐ `mermaid flowchart TD REQ["cache.get(key) or cache.put(key, val)"] CHECK{"Key exists\nin…

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Common Mistakes

🔑 1. No maxmemory Set (Redis/Memcached) ` Problem: Cache server pe maxmemory nahi set kiya.…

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Best Practices

✨ 1. Choose Policy Based on Workload Default LRU best for most cases. Frequency-heavy (CDN,…

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Interview Perspective

🌟 Q1: LRU eviction policy kya hai aur O(1) me kaise implement hoti hai? A: LRU (Least…

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Glossary

🚀 | Term | Definition | |---|---| | Eviction | Cache full hone pe item hatana | | Eviction…

Comparison

Policy Comparison

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LRU: Good

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LFU: Good (frequency workloads)

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FIFO: Fair

Diagram

Visual Flow

📊 Diagram visualization — details in narration

Quiz — Question 1

Cache Eviction ka sabse sahi definition kya hai?

Quick Quiz

Quiz — Question 2

Cache Eviction ka 'Topic' kya hai?

Complete! 🎉

Cache Eviction Complete!

Aliens Wiki · HIEN · Cinematic Knowledge

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Cache Eviction Complete

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Cache Eviction

Cache Eviction — Quick Facts

Property: Detail

Topic: Cache Eviction

Also Known As: Cache replacement, cache expiry,…

Category: Performance / Caching / Scalability

Infobox

What Is Cache Eviction?

LRU: Jo kitaab sabse lambe time se…

LFU: Jo kitaab sabse kam baar…

FIFO: Jo kitaab sabse pehle rakhi…

Random: Koi bhi random hatao

Why Eviction Is Needed

Cache badhta jayega → memory…

Redis: maxmemory set nahi kiya →…

Browser: quota exceed → browser…

CPU: cache fixed size hai →…

Eviction Policies Overview

LRU — Least Recently Used

LFU — Least Frequently Used

FIFO — First In First Out

TTL — Time-to-Live Based

Lazy: Key access pe TTL check →…

Active: Har 100ms me random 20…

Random Eviction

ARC — Adaptive Replacement Cache

Clock / Second-Chance

Other Policies (LRU-K, SLRU, 2Q, TLRU)

Policy Comparison

Eviction in Redis

Random sample of keys (default: 5)…

In me se sabse purana (LRU clock…

maxmemory-samples increase karne…

Redis 4.0+ me LFU bhi available…

Eviction in Memcached

Eviction in CDN

Eviction in CPU Cache

Eviction in OS (Page Replacement)

When to Use Which Policy

LRU Eviction Flow — Mermaid Diagram

Common Mistakes

Best Practices

Interview Perspective

Glossary

Policy Comparison

LRU: Good

LFU: Good (frequency workloads)

FIFO: Fair

Visual Flow

See Also

Cache — General caching concepts

Cache coherence — Multi-cache…

Cache API — Browser Cache API

Redis — In-memory cache + data…

Memcached — High-throughput caching

CDN — Content delivery caching

Quiz — Question 1

Quiz — Question 2

Cache Eviction Complete!

Cache Eviction Complete

Cache — General caching…