Slowing Changing Dimension (SCD) demystified – Part 2
In Part 1 of this series, we looked at SCD Type I. We would now look at the SCD Type...
2012-05-04
743 reads
In Part 1 of this series, we looked at SCD Type I. We would now look at the SCD Type...
2012-05-04
743 reads
SCD is a basically a concept that explains how historical data/values are stored within a data in a database.
There are...
2012-05-03
682 reads
I am responding late to a T-SQL Tuesday invite from John Sterrett. John’s call...
It’s been forgotten about and neglected for few years but I’ve decided to dust...
I am honored to announce that I have been renewed as a Microsoft MVP...
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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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