Introduction:

Oracle Cloud Infrastructure services are hosted in regions and availability domains (AD). Oracle keeps on adding new Regions and AD’s globally. Currently, Oracle services are spread across 30 regions. (As of 12th Oct ’21)

This Image shows OCI- Region and Availability Domain

1. Region is a localized geographic area.
2. A region is a collection of one or more Availability Domains
3. Availability Domains is one or more data centers located within one particular region.
4. Most OCI resources are either Region Specific (VCN) or Availability Domain Specific
(Compute Instance )
5. Currently Oracle has 30 regions across the globe, 14 new to come by the end of year 2022
6. Regions are:
Asia Pacific: Tokyo (Japan), Osaka (Japan), Seoul (South Korea), Chuncheon (South Korea), Mumbai (India), Hyderabad (India), Sydney (Australia), Melbourne (Australia)
Americas: San Jose (United States), Phoenix (United States), Ashburn (United States), Toronto (Canada), Montreal (Canada), São Paolo (Brazil), Vinhedo (Brazil), Santiago (Chile)
Europe: Frankfurt (Germany), London (United Kingdom), Newport, Wales (United Kingdom), Zürich (Switzerland), Amsterdam (The Netherlands)
Middle East: Jeddah (Saudi Arabia), Dubai (U.A.E)
Government: Two general U.S. Government regions, and U.S. National Security regions, three U.S. Department of Defense specific Government regions, two in the United Kingdom (London and Newport, Wales)

OCI- Region and Availability Domain:

1. Availability Domains are isolated from each other.
2. They provide fault tolerance i.e both data centers have different hardware and networks.
3. It’s very unlikely that two Availability Domains go down simultaneously.
4. Failure of one AD within one region will not impact other services on other AD
5. There may be more than 1 Availability Domain within one region.
6. 4 Regions available which has 3 Availability Domains.

Every OCI Region offers selective core infrastructure services, which are following:

1. Storage: Block Volume, File Storage, Archive Storage, Object Storage
2. Compute: Compute Instance (Bare Metal, VM)
3. Networking: Virtual Cloud Network, Subnet, Load Balancing, Fast Connect
4. Database: All supported versions of Database 12cR1, 12cR2, Exadata, Autonomous DB
5. Edge: DNS Services
6. IAM Services, Backup, E-Business Suites, Weblogic, Fusion Middleware

Oracle Cloud team provides two types of regions within OCI Infrastructure.

A. Government Regions
a. This region is very much specific to government Organization bodies to use. These regions are federal compliant.
b. Currently OCI provides two regions for Government Regions ( Phoenix & Ashburn)
c. Two more proposed regions are Chicago & London

B. Commercial Regions
a. Commercial regions are publicly open to all organization
b. Commercial regions are publicly available and can be used by anyone.

Refer to the Blog to know more about OCI- Region and Availability Domain

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