This image shows an Oracle Fusion Middleware stretched cluster topology across two Oracle Cloud Infrastructure (OCI) regions (Frankfurt and Amsterdam) used for performance testing.

The architecture has the following components:

• Context and connectivity
  • The WebLogic domain consists of five servers distributed to compare topologies: servers colocated with the database in the same availability domain (AD), servers in the same region in a different AD, and servers in a different region.
  • SOA DOMAIN: The SOA domain spans the SOAHOST servers and WLS nodes across regions.
  • CLUSTER: The stretched clustrer spans the WLS nodes across regions.
  • DNS (steering policy) answers queries for frontend.example.com and returns the address of the regional load balancer.
  • Clients connect to the selected region through OCI Load Balancer and Oracle HTTP Server.
  • Regions use dynamic routing gateways (DRGs) to provided remote peering between regions.
  • Oracle Data Guard replicates from the Primary RAC database in the FRANKFURT region to the Standby RAC database in the AMSTERDAM region.
• FRANKFURT region
  • Availability domain AD1: Includes Oracle HTTP Server OHSHOST1. SOAHOST1 hosts AdminServer and WLS_PROD1. SOAHOST3 hosts WLS_PROD3. Includes the primary Oracle Real Application Clusters (Oracle RAC) database. File systems Config FS, Runtime FS, and Products1 FS support the domain.
  • Availability domain AD2: Oracle HTTP Server OHSHOST2 appears. SOAHOST2 hosts WLS_PROD2. File systems Products2 FS support the domain.
• AMSTERDAM region
  • Availability domain AD1: Includes Oracle HTTP ServerOHSHOST3 and OHSHOST4. SOAHOST4 hosts AdminServer and WLS_PROD4. SOAHOST5 hosts WLS_PROD5.
  • Includes the standby Oracle RAC database and Config FS, Runtime FS, Products1 FS, Products2 FS file systems.