Contact OLTP Database Server Role Associations

Associated Roles	Mandatory, Optional, or If Exists	Association Scope	Association Type & Limits	Why is this Association Required or used?
Contact Database Server role in the Data Center that includes long-term interactions. The Contact Database is optimized for searching operations, and interactions are inserted and updated in bulk operations.	Mandatory	Enterprise	One-to-one	Automatic Association.
QM Database Server role in the Data Center used to store Quality Monitoring application data.	Mandatory	Enterprise	One-to-one	Automatic Association.