A Directory Service and a database fundamentally work differently. For this reason, they tend to be used for different types of applications. Directory Services are hierarchical based, allowing security to be applied to an object. If you want to add additional objects you need to change the schema. Changes to the schema cannot be undone after they have been made. Here are some guides you may be interested in: Amazon Relational Database Service: How to install Amazon RDS using Terraform, Squid Proxy: How to setup and configure a Proxy Server, How to install, configure Prometheus for Monitoring on a Linux Server, How to install Gradle on Ubuntu, how to install and configure Microsoft Teams on Ubuntu, how to add an EBS volume to AWS EC2, and, how to Deploy MVC Application to AWS EC2 Using RDP.
A directory service is a database for storing and maintaining information about users and resources. Directory Services are often referred to as directories, user stores, Identity Stores, or LDAP Directory, and they store information such as usernames, passwords, user preferences, information about devices, and more.
Since Directory Services is hierarchical in nature, it can perform fast searches, for example looking up a person in the Directory Service would be quite fast. Directory Services can be modified in multiple locations at the same time. If multiple changes are made at the same time, the last write performed will overwrite any previous writes.
A Relational Database in comparison offers faster write times than a directory service as the data is stored in rows and columns rather than in a hierarchy. Data is locked before it is updated so there is no chance that data will be changed in two locations at the same time.
A relational database does not have a schema so changes to the layout of the data can be changed at any time. This includes the ability to reverse changes later on which is not possible with a Directory Service.
I hope you found this blog post helpful. If you have any questions, please let me know in the comment session.