In Oracle Cloud terminology, “Classic” refers to the generation 1 cloud. OCI refers to the generation 2 cloud, which introduced Bare Metal and off-box virtualization for example.

OCI and OCI Classic has different data centers (regions). There are some Classic PaaS services that can be deployed on OCI regions, but those are still managed with the gen1 PSM (PaaS Service Manager Tool), so they also have a different UI compared to OCI services.

“Oracle strongly encourages customers to migrate their existing cloud resources from Oracle Cloud Infrastructure Compute Classic regions.” – Source: Introduction to Migrating to Oracle Cloud Infrastructure.

Oracle already published documentation and eBook for the OCI upgrade.Oracle Cloud Infrastructure (OCI) is a second-generation Cloud that provides a better-than-ever foundation for AI.  Its offer more security, lower Compute costs and manage new high-performance workloads.

Its enterprise cloud platforms with the flexibility and scalability of public clouds.

The new features of the Oracle Generation 2 Cloud extend far beyond the underlying infrastructure. There is a suite of services that span;

– application development,

– integration of Oracle and non-Oracle apps(both on-prem and in the Cloud)

– multiple layers of security for, users, data and infrastructure, and the Oracle Autonomous Database.

https://www.sofbang.com/wp-content/uploads/2019/10/orc-gen2-img1-1024x482.jpg

So What is the Key Features? Here is the answers:

Security – Offer customers effective and easy-to-use application, platform, and network security solutions that allow them to protect their workloads, constrain access to their services, and segregate operational responsibilities to reduce the risk associated with malicious and accidental user actions. OCI now incorporates an identity and access management (IAM) suite into its core cloud offering to provide more security, governance and auditing capabilities. With the IAM suite, administrators can manage users, groups and access privileges.

Performance – Oracle’s latest cloud offering, OCI Generation 2, is not just an upgrade to OCI Classic, it’s a complete rebuild from scratch, incorporating the experience and lessons learned from OCI Classic. The new network design and layout is at the heart of the redesign and is critical to the performance and scaling of OCI v2.0.

Customer Isolation – Allow customers to deploy their application and data assets in an environment that commits full isolation from other tenants and Oracle’s staff. OCI offers Bare Metal instances, VM instances, Virtual Cloud Network and IAM Compartments in order to achieve the customer isolation.

Open Standards – Due to the strong shift to Cloud native technologies and DevOps methodologies across businesses of all sizes, companies are seeking an open Cloud that offers flexibility and avoids lock-in.

High Availability – Offer fault-independent data centers that enable high-availability scale-out architectures and are resilient against network attacks, ensuring constant up time in the face of disaster and security attack.

What is difference for Classic vs OCI Migration Topology

With the launch of Gen 2 new cloud provides more value running the same workloads with better features, faster speed, and lower cost.

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Source:
https://blogs.oracle.com/generation-2:-oracle-cloud-infrastructure

https://docs.oracle.com/en/cloud/iaas/compute-iaas-cloud/migrate-oci/introduction-migrating-oracle-cloud-infrasturcture.html#GUID-FDD1912B-3277-47C2-8269-25BFFBE7E351
https://docs.oracle.com/en/cloud/migrate-oci.html