August 2025
Intermediate to advanced
476 pages
12h 52m
English
Content preview from AWS Certified Data Engineer Associate Study Guide
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Chapter 2. Prerequisite Knowledge for Aspiring Data Engineers
Before being introduced to AWS services, you need to have some prerequisite knowledge on data engineering concepts. This chapter briefly covers the foundational knowledge related to databases, data lakes, data ingestion, data processing, data consumption, working with code repositories, and AWS Cloud that you’re going to need before you begin preparing for AWS Certified Data Engineer Associate certification.
Databases and Types of Databases
Most applications require persistent storage of their data and an efficient way to query it. The data can be stored in different formats depending on use case, but for most use cases, storing in databases is one of the best solutions for persistent storage (if the data is available in structured or semi-structured format). Let’s understand what a database is, and the different types of databases that you can consider while designing your application.
What Is a Database?
A database is a collection of data that can help represent an entity as a table or view having a fixed or flexible set of attributes stored electronically for easier access and management. It provides better performance compared to storing data in files and reading from them.
What Is a Database Management System?
The software system that integrates database features such as create, insert, update, and delete is called a database management system (DBMS). It acts as an interface between the database and the end ...
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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.