April 2024
Beginner
832 pages
20h 32m
English
book
Data Analytics & Visualization All-in-One For Dummies
by Jack A. Hyman, Luca Massaron, Paul McFedries, John Paul Mueller, Lillian Pierson, Jonathan Reichental, Joseph Schmuller, Alan R. Simon, Allen G. Taylor
Content preview from Data Analytics & Visualization All-in-One For Dummies
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Chapter 5
Tuning Queries
IN THIS CHAPTER
Avoiding retrieving duplicate records
Managing multiple selection conditions
Saving resources with temporary tables
Filtering out groups that don’t meet a search condition
Working with indexes
Performance is almost always a top priority for any organizational database system. As the usage of the system goes up, if resources such as processor speed, cache memory, and hard disk storage do not go up proportionally, performance starts to suffer, and users start to complain. Clearly, one thing that a system administrator can do is increase the resources — install a faster processor, add more cache, buy more hard disks. These solutions may give the needed improvement and may even be necessary, but you should try a cheaper solution first: improving the efficiency of the queries that are loading down the system.
Generally, there are several different ways that you can obtain the information you want from a database; in other words, there are several ...
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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.