June 2010
Intermediate to advanced
328 pages
7h 51m
English
Content preview from SQL AntipatternsBecome 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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Antipattern: Using Indexes Without a Plan
When we choose our indexes by guessing, we inevitably make some wrong choices. Misunderstandings about when to use indexes leads to mistakes in one of these three categories:
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Defining no indexes or not enough indexes
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Defining too many indexes or indexes that don’t help
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Running queries that no index can help
No Indexes
We commonly read that a database incurs overhead as it keeps an index up-to-date. Each time we use INSERT, UPDATE, or DELETE, the database has to update the index data structures for that table to be consistent so that our subsequent searches use these indexes to find the right set of rows reliably.
We’re trained to think that overhead means waste. So when we read that the database ...
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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.