Watching Index Use

Question:
The goal is to watch queries for their use, nonuse, or abuse of indices (using SQL Server 6.5). One of the problems is to be sure that a given index is no longer in use. If an index is dropped, is there any way to watch for a table scan–either on this particular table or in general.

Answer:
The best way I know of would be to use the trace utility provided with SQL Server to save a log of activity before the index drop and then compare it to a trace log generated after the index is dropped. The trace log shows the SQL from each statement and the response time. You would look for queries that use that table whose response times have changed significantly. I would suggest loading the trace log into a SQL table to help facilitate the comparison. You can find documentation on the table structure in the online books.

You could then run those same queries in isqlw using both showplan and show statistics to test whether a table scan is occurring.

Share the Post:
Share on facebook
Share on twitter
Share on linkedin

Overview

The Latest

your company's audio

4 Areas of Your Company Where Your Audio Really Matters

Your company probably relies on audio more than you realize. Whether you’re creating a spoken text message to a colleague or giving a speech, you want your audio to shine. Otherwise, you could cause avoidable friction points and potentially hurt your brand reputation. For example, let’s say you create a

chrome os developer mode

How to Turn on Chrome OS Developer Mode

Google’s Chrome OS is a popular operating system that is widely used on Chromebooks and other devices. While it is designed to be simple and user-friendly, there are times when users may want to access additional features and functionality. One way to do this is by turning on Chrome OS

homes in the real estate industry

Exploring the Latest Tech Trends Impacting the Real Estate Industry

The real estate industry is changing thanks to the newest technological advancements. These new developments — from blockchain and AI to virtual reality and 3D printing — are poised to change how we buy and sell homes. Real estate brokers, buyers, sellers, wholesale real estate professionals, fix and flippers, and beyond may