Assembly: Microsoft.SqlServer.Smo (in microsoft.sqlserver.smo.dll)
The Update method compares the current instance and application definitions in the databases with your definitions of the instance and its applications. For each valid change, the Update method updates the database as specified.
Not all of the instance and application properties can be updated. For example you cannot change the instance and application database definitions. For more information, review the documentation for the properties you are updating.
Altering some EventClass, SubscriptionClass, and NotificationClass properties can delete or rename existing tables in the application database. Review the properties you are changing to make sure you know the effects of the changes.