Book Image

AWS Certified Database – Specialty (DBS-C01) Certification Guide

By : Kate Gawron
5 (1)
Book Image

AWS Certified Database – Specialty (DBS-C01) Certification Guide

5 (1)
By: Kate Gawron

Overview of this book

The AWS Certified Database – Specialty certification is one of the most challenging AWS certifications. It validates your comprehensive understanding of databases, including the concepts of design, migration, deployment, access, maintenance, automation, monitoring, security, and troubleshooting. With this guide, you'll understand how to use various AWS databases, such as Aurora Serverless and Global Database, and even services such as Redshift and Neptune. You’ll start with an introduction to the AWS databases, and then delve into workload-specific database design. As you advance through the chapters, you'll learn about migrating and deploying the databases, along with database security techniques such as encryption, auditing, and access controls. This AWS book will also cover monitoring, troubleshooting, and disaster recovery techniques, before testing all the knowledge you've gained throughout the book with the help of mock tests. By the end of this book, you'll have covered everything you need to pass the DBS-C01 AWS certification exam and have a handy, on-the-job desk reference guide.
Table of Contents (24 chapters)
1
Part 1: Introduction to Databases on AWS
Free Chapter
2
Chapter 1: AWS Certified Database – Specialty Overview
5
Part 2: Workload-Specific Database Design
12
Part 3: Deployment and Migration and Database Security
16
Part 4: Monitoring and Optimization
20
Part 5: Assessment
21
Chapter 16: Exam Practice

Redis versus Memcached

ElastiCache supports both Redis version 2.8 onward and Memcached 1.4 onward. These two database engines both support caching operations, but how they do that and what features they support differs. Let's start by looking at Redis.

Redis

Redis can be used as both a caching database and a non-durable data store due to its ability to store key-value pairs in a similar manner to other NoSQL databases. Redis also offers a wide range of features that NoSQL databases typically support, such as sharding, read replicas, and backups.

Read replicas are nodes that are only able to handle read operations. A primary node can handle both reads and writes. Redis uses a system called a shard, which contains one primary node and up to five read replicas. Redis can create up to 500 shards when running in cluster mode. In non-cluster mode (or with cluster mode disabled), Redis will create a single shard. The main benefit to running with cluster mode disabled is that...