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

Understanding replicas and multi-AZ

Many database deployments require high availability or a failover strategy to meet the recovery point objectives (RPOs) and recovery time objectives (RTOs) of the application. RDS offers two different solutions to meet those requirements:

  • Multi-AZ deployments
  • Read replicas

Both of these technologies offer enhanced protection from a primary database failing and will speed up any database recovery strategy, but they use different methods and have different use cases.

Multi-AZ

In Chapter 3, Understanding AWS Infrastructure, we learned about AWS infrastructure, VPCs, and Availability Zones (AZs). A Multi-AZ deployment is one in which you provision a primary database in one AZ and standby databases in one or more different AZs. The primary and standby databases are kept synchronized either using their native replication technology (Always On for SQL Server, for example) or by using an AWS-specific technology. The syncing process...