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Schema-Based Access Control for SQL Server Databases. Access-control within the database is important for the security of data, but it should be simple to implement. It is easy to become overwhelmed by the jargon of principals, securables, owners, schemas, roles, users and permissions, but beneath the apparent complexity, there is a schema. Mar 10, 2014 · Created a login on the server for the group. Assigned the login to the db_datareader role on the model database. Assigned the login to the db_datareader role on all the pre-existing databases. Added my windows users into the AD group. This way, you can simply assign (or train your servicedesk folks to assign) users who need read only access to .... Create SQL Server Roles and Add Members. For the SqlDBAGroup, we will can use Server Roles to give permission at the server level. You have the option to either use the Fixed Server-Level Roles or create your own custom Server-Level Role. One benefit is that with the custom role, you can design very specific privileges precisely for your system.