Unique and non-unique SQL Server indexes on a heap table
In the upcoming weblog postings I want to work out the differences between unique
and non-unique indexes in SQL Server. I...
2010-08-18
3,221 reads
In the upcoming weblog postings I want to work out the differences between unique
and non-unique indexes in SQL Server. I...
2010-08-18
3,221 reads
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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?
See possible answers