Noam Brezis is a technology expert and a senior SQL Server consultant at Madeira SQL Server Services. With over 10 years of experience in various technologies, he enjoys a wide knowledge range, from Visual C#, .Net, C++, MFC, COM and VB, through UNIX and Oracle and up to a deep and thorough understanding of SQL Server. In his work, Noam deals on a daily basis with a broad and varied clientele, designing, developing and troubleshooting their SQL Server systems. Noam also spends part of his career teaching SQL Server and frequently speaks at events such as the Israeli SQL Server User Group.

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Blog Post

Pro and Cons of Parameter Sniffing

Look at the following 3 scripts:
-- 1. Hardcoded
SELECT
*
FROM
Sales.Orders
WHERE
DateAndTime < '19900101'

-- 2. Variable
DECLARE @FilterDate DATETIME = '19900101'
SELECT
*
FROM
Sales.Orders
WHERE
DateAndTime...

2012-01-02

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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?

See possible answers