support@testinganswers.com
Interview Questions, Answers and Tutorials

Category: 11. Indexes and Performance

Index Superpowers! Making Slow Queries Run Like Lightning

11. Indexes and Performancetestinganswers.com
Imagine your database is a huge school library. Now here’s the problem If the librarian checks every single book, it’s slow But if the librarian uses a catalog (index) → FAST! That’s exactly what indexes do in databases like MySQL. What Is an Index? Index = Book’s Table of Contents Instead of reading the whole book: In databases: Query Without Index (Slow Way) Database checks every student one by oneThis is called Full Table Scan Query With Index (Fast Way) Now run the same query: MySQL uses the indexJumps directly to age = 10Super fast! How Indexes Work Think of…

Speed Superpowers for Databases! Becoming an Index Ninja

11. Indexes and Performance, Testingtestinganswers.com
Imagine a huge library with millions of books.If the books are not organized, finding one book will take forever. Now imagine the library has a magic index card system that tells you exactly where each book is.That magic system is called an INDEX in databases. In this lesson, we’ll learn about Creating and Managing Indexes inMySQL— step by step, slowly, clearly, and with lots of examples. What Is an Index? An index is like: It helps MySQL find data faster without checking every row. Without Index vs With Index Without Index With Index MySQL checks every row MySQL jumps directly…

Speed Superpowers! How Database Indexes Help Find Data Fast

11. Indexes and Performancetestinganswers.com
Imagine you have a huge storybook with 10,000 pages. Databases work the same way.That magical shortcut is called an INDEX. What Is an Index? An index is like: It helps MySQL find data faster without checking every row. Without Index MySQL says: “Let me check row 1… row 2… row 3… row 1,000,000…” With Index MySQL says: “Aha! I know exactly where this data lives!” Real-Life Example Imagine a school register: Roll No Name 1 Rahul 2 Anya 3 Rohan If the teacher wants Rohan: Table Example (Our Playground) Searching WITHOUT an Index MySQL scans every rowSlow for big tablesThis…