December 2002
Intermediate to advanced
1560 pages
40h 44m
English
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Common Query Optimization Problems
So you've written the query and examined the query plan, and performance isn't what you expected. It might appear that SQL Server isn't choosing the appropriate query plan that you expect. Is something wrong with the query or with the optimizer? Before we delve into a detailed discussion about how to debug and analyze query plans (covered in detail in the next chapter), this section takes a look at some of the more common problems and SQL-coding issues that can lead to poor query plan selection.
Out-of-Date or Unavailable Statistics
Admittedly, this is not as big a problem as it was in SQL Server releases prior to 7.0. Back in those days, the first question asked when someone was complaining of poor performance ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.