TheSQLPro

Ayman is a passionate SQL Server DBA, Developer, and Business Intelligence Developer. His passion for technology started when he was a young boy playing DOS games on his father's computer. From there, he moved up to computer programming in high school and went on to get B.S. and M.S. degrees in Information Systems from Drexel University in Philadelphia. He has worked with the SQL Server product since 2006 and has experience with SQL 2000 through SQL 2012. He holds a MCITP SQL 2008 DBA certification and is also a Microsoft Certified Trainer (MCT. He has been active with the virtual chapters of PASS, participating in online training and also giving presentations. Ayman has lived in many different countries around the world including the U.S., U.K., Egypt, Saudi Arabia and speaks fluent Arabic. He is huge football(soccer) fan and is always looking forward to learn more about SQL Server, SQL Server BI, and technology in general. www.thesqlpro.com

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What is KTLO? Keep The Lights On vs Project Work in Agile

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🔍 Demystifying KTLO: A Deep Dive into Keep The Lights On Work in IT...

The PASS Summit on Tour in Dallas

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The PASS Summit goes on tour this year, with a September stop in Dallas....

SQL Server Auto-settings: The Good, the Bad, and the Ugly

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Settings That Could Be Hurting Your Performance If you’ve ever created a new SQL...

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Forums

How a Legacy Logic Choked SQL Server in a 30-Year-Old Factory

By Chandan Shukla

Comments posted to this topic are about the item How a Legacy Logic Choked...

Formatting Dates and Times: The SQL Dialect Divide

By dbakevlar

Comments posted to this topic are about the item Formatting Dates and Times: The...

Query Plan Regressions --

By dbakevlar

Comments posted to this topic are about the item Query Plan Regressions --

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Question of the Day

Query Plan Regressions --

For the Question of the day, I am going to go deep, but try to be more clear, as I feel like I didn't give enough info last time, leading folks to guess the wrong answer... :) For today's question:  You’re troubleshooting a performance issue on a critical stored procedure. You notice that a previously efficient query now performs a full table scan instead of an index seek. Upon investigating, you find that an NVARCHAR parameter is being compared to a VARCHAR column in the WHERE clause. What is the most likely cause of the query plan regression?

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