September 2015
Beginner to intermediate
230 pages
4h 47m
English
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Bitmaps
A Bitmap is not a real data type in Redis. Under the hood, a Bitmap is a String. We can also say that a Bitmap is a set of bit operations on a String. However, we are going to consider them as data types because Redis provides commands to manipulate Strings as Bitmaps. Bitmaps are also known as bit arrays or bitsets.
A Bitmap is a sequence of bits where each bit can store 0 or 1. You can think of a Bitmap as an array of ones and zeroes. The Redis documentation refers to Bitmap indices as offsets. The application domain dictates what each Bitmap index means.
Bitmaps are memory efficient, support fast data lookups, and can store up to 232 bits (more than 4 billion bits).
See this example of a Bitmap with three bits turned on and two turned ...
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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.