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Index (Database)

Database Index ek special data structure hai jo database me data ko fast search, sort, aur retrieve…

Overview

Index (Database) — Quick Facts

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Property: Detail

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Full Name: Database Index

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Type: Data Structure / Database…

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Purpose: Fast data retrieval without full…

Topic 1

Infobox

📊 | Property | Detail | |---|---| | Full Name | Database Index | | Type | Data Structure /…

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Simple Explanation

💾 Real-Life Analogies | Scenario | Without Index | With Index | |---|---|---| | Book me…

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Why Index Matters

🗄️ | Metric | Without Index (10M rows) | With Index (10M rows) | |---|---|---| | SELECT by…

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How Index Works

📈 | Step | Internal Action | |---|---| | 1. Index Create | Database column values ko sorted…

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Index Lookup Flow

🔍 `mermaid flowchart TD A[📥 Query Arrives<br/>SELECT * FROM users<br/>WHERE email =…

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Index Types

📉 | Index Type | Structure | Best For | Example Use Case | |---|---|---|---| | B-Tree |…

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B-Tree Index Deep-Dive

🧮 | Property | Detail | |---|---| | Structure | Balanced tree — root → branch → leaf nodes…

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Composite Index

🌐 Composite Index = ek index jo multiple columns pe banta hai. | Aspect | Detail |…

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Covering Index

📊 Covering Index = index me hi sab required columns hain — table pe jaane ki zaroorat nahi.…

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Partial Index

💾 Partial Index = sirf subset of rows pe index — WHERE condition ke saath. | Aspect | Full…

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Unique Index

🗄️ | Aspect | Detail | |---|---| | Purpose | Ensure no duplicate values in indexed column |…

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Index Scan vs Full Table Scan

📈 | Factor | Index Scan | Full Table Scan | |---|---|---| | When | Selective query (small %…

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Index in Different Databases

🔍 | Database | Default Index | Unique Features | |---|---|---| | PostgreSQL | B-Tree | GIN,…

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When NOT to Index

📉 | Scenario | Why Not | |---|---| | Small tables (<1000 rows) | Full scan fast enough —…

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Index Maintenance

🧮 | Task | Why | Frequency | |---|---|---| | ANALYZE / UPDATE STATISTICS | Query planner ko…

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Best Practices

🌐 | Practice | Why | |---|---| | Index columns in WHERE, JOIN, ORDER BY | Most impactful…

Comparison

Index Scan vs Full Table Scan

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When: Selective query (small % of rows)

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Speed (selective): ⚡ Fast

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Speed (full table): 🐌 Slower (random IO)

Diagram

Visual Flow

📊 Diagram visualization — details in narration

Quiz — Question 1

Index (Database) ka sabse sahi definition kya hai?

Quick Quiz

Quiz — Question 2

Index (Database) ka 'Full Name' kya hai?

Complete! 🎉

Index (Database) Complete!

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Index (Database) Complete

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Index (Database)

Index (Database) — Quick Facts

Property: Detail

Full Name: Database Index

Type: Data Structure / Database…

Purpose: Fast data retrieval without full…

Infobox

Simple Explanation

Why Index Matters

How Index Works

Index Lookup Flow

Index Types

B-Tree Index Deep-Dive

Composite Index

Covering Index

Partial Index

Unique Index

Index Scan vs Full Table Scan

Index in Different Databases

When NOT to Index

Index Maintenance

Best Practices

Index Scan vs Full Table Scan

When: Selective query (small % of rows)

Speed (selective): ⚡ Fast

Speed (full table): 🐌 Slower (random IO)

Visual Flow

See Also

Index Scan

Index Tuning

Query Optimization

B-Tree

SQL

Database

Quiz — Question 1

Quiz — Question 2

Index (Database) Complete!

Index (Database) Complete

Index Scan