February 2018
Intermediate to advanced
382 pages
11h 33m
English
Content preview from Redis 4.x Cookbook
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How it works...
When a timeout is set on a Redis key, the expiration time for the key will be stored as an absolute UNIX timestamp. Therefore, even if the Redis Server is down for some time, the expiration timestamp won't be lost and the key will still expire when the server is up again and the clock has passed the UNIX timestamp.
When a key has expired and the client tries to access it, Redis will delete the key from memory immediately. The way Redis deletes a key is known as expiring passively. What if a key has expired but it will never be accessed again? Redis also actively deletes expired keys by running a probabilistic algorithm periodically. Specifically, Redis randomly picks 20 keys associated with the timeout. Expired keys will be ...
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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.