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

Chapter 9

  1. 2 and 3

You do not know when the peak hours for this application are, so setting backups to midnight might make things worse.

Setting reserved-memory-percent stops backups from taking all the memory and is correct.

Running a backup from the read replica will also reduce the load on the primary instance and is correct.

Additional read replicas will not help as the load is on the primary instance.

Increasing the number of shards will not help as the load will remain the same.

  1. 1

Write-through applies the changes to the cache first before writing to the database so the data is always current, and this is the correct answer.

Lazy-loading is where the cache only loads data after it is requested and it doesn't maintain current data.

Cache-aside is where the application can directly access both the database and the cache.

Read-through is where the application can only access the cache directly.

  1. 1

Redis (cluster mode...