I have created a geodatabase by using arccatalog 10 and sqlserver 2008. And I have also created the different tables, feature classes and a dataset to group my feature classes. As the geodatabase is going to be used by other applications, so I am wondering if I could add my constraints (foreign keys, unique constraints) to my tables by using Sql Server Management Studio without affecting the connection and the work of ArcMap and ArcCatalog with the geodatabase. Thank you very much for your help. Alaeddine Saadaoui. saadaoui@marshall.edu