Skill Topic · Cinematic

📘 MongoDB — Replication

High availability — replica sets se data safe aur always available! 🔄

Topic 1

📌 1. Replication Kya Hai?

📚 ` Single Server: ┌──────────┐ │ MongoDB │ ← Agar crash ho gaya? │ (alone) │ DATA LOST!…

Topic 2

💡 ` ┌─────────────────────────────────┐ │ Replica Set │ ├─────────────────────────────────┤…

Topic 3

🎯 `bash ═══ Step 1: Start 3 mongod instances ═══ Node 1: mongod --replSet rs0 --port 27017…

Topic 4

⭐ `javascript // ═══ Check status ═══ rs.status() // Shows: all members, who is primary,…

Topic 5

🔑 `javascript // ═══ Oplog = Replication log ═══ // local.oplog.rs collection me store hota…

Topic 6

✨ `javascript // ═══ Where to read from? ═══ // primary (default): // Always read from…

Topic 7

🌟 `javascript // ═══ How many nodes must confirm write? ═══ // w: 1 (default) — Primary…

Topic 8

🚀 ` Election Process: 1. Primary unreachable detected 2. Eligible secondaries start…

Topic 9

📚 `javascript // ═══ Replica set status ═══ rs.status() // Key fields: //…

Topic 10

💡 `javascript // ═══ 1. Reporting on secondary ═══ // Don't burden primary with heavy…

Topic 11

🎯 KEY POINTS: - Replica Set = primary + secondaries (minimum 3 members recommended) -…

Quick Quiz

📘 MongoDB — Replication ka sabse sahi definition kya hai?

Complete! 🎉

Aliens School · HIEN · Cinematic Knowledge

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