The image shows a multi-data center deployment using Oracle Global Data Services (GDS).

At the top, two separate data centers (Data Center 1 and Data Center 2) host application and mid-tier servers, represented by user and server icons.

In the middle layer, labeled "Global Data Services," Global Service Managers (GSMs) and a shared GDS Catalog (depicted as key/server icons) facilitate centralized management of global services across both data centers, with synchronization between the GDS Catalogs.

The bottom layer, "Database Tier," shows two example service pools:

• The Sales GDS Pool (order_entry_service), with databases in both data centers, replicates data using either Active Data Guard or Oracle GoldenGate.
• The HR GDS Pool (payroll_service) uses Oracle GoldenGate for replication.

Arrows indicate the flow of data and synchronization between database replicas in the two data centers.