October 2003
Intermediate to advanced
1072 pages
24h 21m
English
Content preview from Guru's Guide to SQL Server Architecture and Internals, TheBecome 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,
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Key Terms and Concepts
✓ Predicate— an expression that evaluates to true, false, or unknown.
✓ Cardinality— strictly speaking, refers to the number of unique values in a table. Because SQL Server allows tables to have duplicate rows and indexes to have duplicate key values, cardinality often more generally refers to the number of rows in a table or the number of rows returned by a query plan operator when discussed from a SQL Server perspective. Cardinality can also refer to the number of unique values in an index.
✓ Density— refers to the uniqueness of values within a data set. An index's density is computed by dividing the number of rows that would correspond to a given key value by the number of rows in the table.
✓ Selectivity— a measure ...
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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.