November 2009
Intermediate to advanced
848 pages
30h 4m
English
book
SQL Server MVP Deep Dives
by Adam Machanic, Greg Low, Kimberly Tripp, Paul S. Randal, Kalen Delaney, Paul Nielsen
Content preview from SQL Server MVP Deep DivesBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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.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.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.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.
Chapter 17. Build your own index
Erland Sommarskog
Consider this SQL query:
SELECT person_id, first_name, last_name, birth_date, emailFROM persons WHERE email LIKE '%' + @word + '%'
You can immediately tell that the only way the SQL Server can evaluate this query is to look through every single email address, be that by scanning the table or by scanning an index on the email column. If the table is large, say, ten million rows, you can expect an execution time of at least a minute.
Imagine now that there is a requirement that in most cases the response time for a search should be only a few seconds. How could you solve this? Regular indexes do not help, nor do full-text indexes; to be efficient both require that there is no leading wildcard ...
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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.