OCI: Basic Naming and Terminology's Part-2

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Tenancy

The general meaning of Tenancy is:

Tenant = a person who uses or occupies something.

Tenancy = the agreement or arrangement under which they use it.

When you create OCI services, Oracle creates a tenancy for you.

Within the datacenter, you can create multiple tenancies.

Tenancy includes all of your OCI resources, including storage, databases, compute instances, and more.

While creating the tenancy, we need to provide the region, which is called your home region. We may additionally subscribe to other regions.

When you are going to create a tenancy, Oracle will create the compartment called the root compartment.

Region

The general meaning of Region is an area or a particular place/location.

Region is basically the geographical area where Oracle data centers are located.

Regions contain physical datacenters.

Those datacenters are named Availability Domains.

Each region can have multiple datacenters or can have one datacenter.

Your cloud account has a home region, and you can subscribe to additional regions.

OCI Console shows both subscribed and unsubscribed regions.

Availability Domain (AD)

Availability Domain is made up of several datacenters within a region.

Some datacenters have three Availability Domains, while others have only one Availability Domain.

It provides high availability for the region.

Fault Domain

Fault Domain is a grouping for hardware and infrastructure within an Availability Domain.

Each Availability Domain has three Fault Domains.

It is used to avoid hardware failure. If any hardware failure happens, the application will run from another Fault Domain.

If Oracle plans maintenance activities such as patching, upgrades, and so on, it will shift the application from one Fault Domain to another Fault Domain so end users do not face any discontinuity.


Sample diagram of Region, Availability Domain (AD), and Fault Domain (FD)

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