Table Indexing

1. What is Indexing?

An index is a data structure that allows the database to find and retrieve specific rows much faster than scanning the entire table. Think of it like the index in a book, which helps you quickly locate a topic without reading every page.

2. How Indexing Improves Query Performance

3. Types of Indexes

4. When to Use Indexes

5. Creating Indexes

In SQL, you can create an index using:

CREATE INDEX index_name ON table_name (column_name);

For a composite index:

CREATE INDEX index_name ON table_name (column1, column2);

6. Best Practices

7. Analyzing Query Performance

Run the query with EXPLAIN to check if indexes are being used effectively:

EXPLAIN SELECT * FROM table_name WHERE column_name = 'value';

This will show whether the database uses an index or performs a full table scan.

8. Downsides of Indexing

By strategically applying indexes and monitoring their effectiveness, you can significantly speed up query performance in your database.


Revision #1
Created 15 November 2024 02:39:07 by Ahmad
Updated 15 November 2024 05:17:18 by Ahmad