Skill Topic · Cinematic

📘 MongoDB — Performance & Profiling

Slow queries dhundho, optimize karo, production-ready banao! ⚡

Topic 1

📌 1. explain() — Query Analysis

📚 `javascript // ═══ explain() modes ═══ db.users.find({ age: { $gt: 25 } }).explain() //…

Topic 2

💡 ` Winning Plan Stages: COLLSCAN ← Collection scan (NO index) — BAD! IXSCAN ← Index scan —…

Topic 3

🎯 `javascript // ═══ Enable profiling ═══ db.setProfilingLevel(0) // Off (default)…

Topic 4

⭐ `javascript // ═══ See what's running RIGHT NOW ═══ db.currentOp() // ═══ Long-running…

Topic 5

🔑 `javascript // ═══ Server stats ═══ db.serverStatus() // Key sections:…

Topic 6

✨ `javascript // ═══ Find missing indexes ═══ // Step 1: Enable profiler…

Topic 7

🌟 `javascript // ═══ 1. Covered query (fastest!) ═══ db.users.createIndex({ email: 1, name:…

Topic 8

🚀 `javascript // ═══ 1. Bulk operations ═══ // BAD (1000 separate calls): for (let i = 0; i…

Topic 9

📚 ` WiredTiger Storage Engine Cache: ┌────────────────────────────────────────────┐ │…

Topic 10

💡 `javascript // ═══ mongostat (CLI) ═══ // mongostat --host localhost:27017 // Shows:…

Topic 11

🎯 ` ┌─────────────────────────────────────────────────────┐ │ Performance Optimization…

Topic 12

⭐ KEY POINTS: - explain("executionStats") = query performance analyze karo - COLLSCAN =…

Quick Quiz

📘 MongoDB — Performance & Profiling ka sabse sahi definition kya hai?

Complete! 🎉

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