January 2016
Intermediate to advanced
240 pages
7h 36m
English
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Understanding Query Performance with the Query Plan
If you aren’t familiar with database indexes, Wikipedia has a pretty good definition,[37] but in essence, an index is a data structure created inside the database that speeds up query operations. Usually, databases use advanced data structures like B-trees to find the data you’re looking for without examining every single row in a table.
If you are familiar with indexes, you might only be familiar with the type of indexes that can be created by Active Record’s Migrations API. This API provides a “lowest common denominator” approach. The best we can do is create an index on last_name, first_name, and email. Doing so won’t actually help us because of the search we are doing. We need to match ...
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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.