This article discusses the importance of database indexes, how indexing in a database boosts performance, and it is from my eBook:
What is a Database Index?
Imagine that you have a large book and you are looking for a specific piece of information. If the book has 500 pages and has no index, you will have to go through page by page until to find the information you are looking for. The worst-case scenario would be to check all 500 pages. That would be a full “scan” of the book. However, if the book has an index, you will just go through the index list and find the page that contains the information you are looking for.
The same thing happens with databases. In the database world, seeking specific information in a frequently-used large table without using an index, could end-up scanning the entire table thus taking a considerable amount of time. However, when having an index, eventually the data retrieval time would be much faster as the operation will not have to search every row in the database table every time the database table is accessed.
Strengthen your SQL Server Administration Skills – Enroll to the online course!
Check our online course titled “Essential SQL Server Administration Tips“
(special limited-time discount included in link).
Learn essential hands-on SQL Server Administration tips on SQL Server maintenance, security, performance, integration, error handling and more. Many live demonstrations and downloadable resources included!
The Importance of Indexing in a Database
Even though indexes are key data structures in databases, they bring the cost of additional writes and the use of more storage space to maintain the extra copy of data. In addition, they need to be frequently maintained in order to be as performant as possible. Nevertheless, the performance gain when using indexes is significant thus making the overheads of maintaining them negligible.
In order to have a healthy set of indexes you need to run frequent maintenance operations. Such operations include index fragmentation checks, reorganization and rebuild actions.
Featured Online Courses:
- Boost SQL Server Database Performance with In-Memory OLTP
- Essential SQL Server Administration Tips
- SQL Server Fundamentals – SQL Database for Beginners
- Introduction to Computer Programming for Beginners
- .NET Programming for Beginners – Windows Forms with C#
- Introduction to Data Science and SQL Server Machine Learning
- Introduction to Azure SQL Database for Beginners
- SQL Server 2019: What’s New
- Entity Framework: Getting Started – Complete Beginners Guide
- How to Import and Export Data in SQL Server
- Get Started with SQL Server in 30 Minutes
- A Guide on How to Start and Monetize a Successful Blog
- SQL Server Index Rebuild Scripts
- Locking and Blocking in SQL Server
- The TempDB System Database in SQL Server
- In-Memory OLTP Simulator: The Experiment
Subscribe to our newsletter and stay up to date!
Subscribe to our YouTube channel (SQLNetHub TV)
Easily generate snippets with Snippets Generator!
Secure your databases using DBA Security Advisor!
Generate dynamic T-SQL scripts with Dynamic SQL Generator!
Check our latest software releases!
Check our eBooks!
Rate this article:
Reference: SQLNetHub (https://www.sqlnethub.com)
Artemakis Artemiou is a Senior SQL Server Architect, Author, a 9 Times Microsoft Data Platform MVP (2009-2018) and a Udemy Instructor. He has over 15 years of experience in the IT industry in various roles. Artemakis is the founder of SQLNetHub and TechHowTos.com. Artemakis is the creator of the well-known software tools Snippets Generator and DBA Security Advisor. Also, he is the author of many eBooks on SQL Server. Artemakis currently serves as the President of the Cyprus .NET User Group (CDNUG) and the International .NET Association Country Leader for Cyprus (INETA). Moreover, Artemakis teaches on Udemy, you can check his courses here.