What is indexing in SQL databases?

What is indexing in SQL databases?

Indexing in SQL databases is a data structure technique that improves the speed of data retrieval operations on a database table.

How does indexing improve query performance?

Indexing allows the database to find data without scanning the entire table, significantly reducing the time it takes to execute queries.

Are there different types of indexes?

Yes, there are several types of indexes, including unique indexes, composite indexes, and full-text indexes, each serving different purposes.

Can indexing slow down data modification operations?

Yes, while indexing speeds up read operations, it can slow down write operations like INSERT, UPDATE, and DELETE due to the overhead of maintaining the index.

When should I use indexing in my database?

You should use indexing when you have large tables and frequently run queries that filter or sort data, but be mindful of the trade-offs.