3 Nasty I/O Statistics That Lag SQL Query Performance

3 Nasty I/O Statistics That Lag SQL Query Performance

This article describes several ways to reduce SQL Server logical reads in I/O Statistics for fine-tuning SQL query performance.

“But it ran fine on our development server!”

How many times did I hear it when SQL query performance issues occurred here and there? I said it myself back in the day. I presumed that a query running in less than a second would run fine in production servers. But I was wrong.

Can you relate to this experience? If you are still in this boat today for whatever reason, this post is for you. It will give you a better metric of fine-tuning your SQL query performance. We’ll talk about three of the most critical figures in STATISTICS IO.

As an example, we will use the AdventureWorks sample database.

Before you start running queries below, turn on STATISTICS IO. Here’s how to do it in a query window:

USE AdventureWorks


Once you run a query with STATISTICS IO ON, different messages will appear. You can see these in the Messages tab of the query window in SQL Server Management Studio (see Figure 1):

Figure 1: Sample STATISTICS IO output in the Message tab of SSMS

Now that we’re done with the short intro let’s dig deeper.

sql server query performance ssms sql

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