September 2014
Intermediate to advanced
298 pages
6h 13m
English
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The query cache
The query cache stores the results of the previously executed select statements so that they may be reused if the same query is issued again. If data is updated/added to a table, the query cache is flushed, and the data should be retrieved once again from the disk on the next SELECT query.
When there are too many concurrencies, the query cache could be a bottleneck. Depending on the size of the database and the requested access, here are two scenarios:
- Smaller database, no high load traffic, no money: The query cache should help you to get fast database access
- Huge database, high load traffic, money: Disable the query cache, optimize your indexes, spread the read load across several read-only replicas, and use a better caching mechanism, ...
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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.