Скачать или смотреть What is an Index in Database? | Sequential vs. Index Scan | PostgreSQL Performance Tuning

What is an Index in Database? | Sequential vs. Index Scan | PostgreSQL Performance Tuning

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Описание к видео What is an Index in Database? | Sequential vs. Index Scan | PostgreSQL Performance Tuning

Welcome to Dev Portal!
In this video, we’re breaking down one of the most powerful feature for database performance tuning - Indexes.

Whether you're a beginner trying to understand how queries become faster or a backend dev looking to optimize database queries, this tutorial is for YOU!

Important Links
Notes: https://github.com/nakulmitra/database-pos...
Page Layout in PostgreSQL: https://www.postgresql.org/docs/17/storage...

Topics Covered:
Sequential Scan vs Index Scan Explained
How PostgreSQL stores data (Heap, Pages, TIDs)
Index Internals (B-Trees and TID lookup)
Index Creation Syntax
PostgreSQL Optimization Tips

Timestamp:
00:00 - Introduction
00:31 - What is an Index in a Database?
01:14 - Why Indexes are Important
02:37 - Query Performance - Without Index (Sequential Scan on Heap)
06:09 - Sequential Scan Execution Planner
09:39 - Query Performance - With Index (Index Scan + Heap Fetch)
13:35 - Index Scan Execution Planner
15:49 - How to Create Single-Column and Multi-Column Indexes
17:30 - Important Considerations for Indexes
19:23 - Best Practices and Warnings

What’s Next?
In the next tutorial, we’ll go deeper into:
How data is stored on disk
Why PostgreSQL uses sequential scan even if an index exists
When PostgreSQL chooses Index Scan vs Index-Only Scan

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