Connections to data sources are defined in the Oracle BI repository. Repository developers use the Administration Tool to configure data source connections by importing metadata and configuring connection pools.
See Importing Metadata and Working with Data Sources in Metadata Repository Builder's Guide for Oracle Business Intelligence Enterprise Edition.
You might need to update connection pool information in the repository during migrations to production and other environments. You can use the Oracle BI Server XML API to automate these connection pool changes. See Moving from Test to Production Environments in XML Schema Reference for Oracle Business Intelligence Enterprise Edition.