Where does slow performance come from?

SQL Server 2005, SQL Server 2008, SQLServerPedia Syndication, TSQL, Visual Studio
I have my opinions and experience, and I’ve no doubt you have yours. Paul Randal (blog|twitter) has put up another one of his interesting surveys to try to collect our opinions and our experience. You should run right over to here and vote immediately. Now that you’ve completed that, I’ll tell you what I think. Based on my experience (neither particularly broad, nor particularly deep, but there has been quite a bit of it), I’ve mostly seen problems in code. When talking about databases, the T-SQL code. When talking about apps, the application code. This is followed not too far back by really poor database structures and poor indexing strategies. I’m sure other people have seen other things, but these really are the areas where I’ve seen the most problems. The one…
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