July 2015
Beginner to intermediate
162 pages
3h 31m
English
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Therein lies the problem
By insulating the database from the read load, a problem is introduced in the form of a cache consistency issue. How does the local data cache deal with data changing underneath it within the primary database? The answer is rather disappointing—it can't! The manifestation of issues will largely depend on the data needs of the application and how frequently the data changes, but typically, caching systems will operate in one of the following two modes to combat the problem:
- Time-bound cache: This holds entries for a defined period (time-to-live, popularly abbreviated as TTL)
- Write-through cache: This holds entries until they are invalidated by subsequent updates
Time-bound caches almost always have consistency issues, but ...
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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.