The first time you open the SQL Diagnostic Manager Management Console, SQL Diagnostic Manager displays the Connect to SQL Diagnostic Manager Repository window. Use this window to select the SQL Server instance, the SQL Diagnostic Manager Repository database name, and enter the authentication details the SQL Diagnostic Manager Console uses to communicate with the SQL Diagnostic Manager Repository.
The SQL Diagnostic Manager Console requires Read Access on the SQL Diagnostic Manager Repository database. You can use either Windows Authentication or SQL Server Authentication for this connection.
Access the Connect to SQL Diagnostic Manager Repository window
You can open the Connect to SQL Diagnostic Manager Repository window from the SQL Diagnostic Manager Console, selecting 
> Connect to SQLDM Repository. The ability to connect to another Repository is important in disaster recovery situations where you need to change the location of your SQL Diagnostic Manager Repository.