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

Performance tuning and maintaining DocumentDB

DocumentDB is a very specialized database, so tuning methods that are used on other systems are not that effective. It is important to choose the right size instance for your DocumentDB as this controls the resources it is given. Without sufficient memory and CPU, your performance will be poor and queries will be slow. If you are migrating from MongoDB, it is recommended to match the resource that was allocated to your MongoDB cluster initially as a start and tune from there. For a new workload, it can be different to accurately estimate the resources needed. For those cases, you need to test different instance sizes as extensively as possible before launching your production or critical workloads.

Once your primary instance has been sized correctly, you can consider some other performance tuning options such as read replicas.

Read replicas

DocumentDB allows for up to 15 read replicas per cluster. A read replica is a copy of...