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Function Creates, alters, and resizes databases. Manages database storage files. Kills (stops) processes running on the server. Creates and manages server logins and auditing. Changes server configuration parameters and shuts down server. Manages replication and extended procedures. Completes control over all database functions.
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3. Optionally, you can click the Permissions tab to see the permissions available for this user, as shown here:
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NOTE: You won t be able to change the options for built-in server roles.
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Large and complex database applications often enforce their own security based on business rules. For example, an accounting package might enforce security permissions that allow a specific user to update a database only during specific hours. The application itself will use a single login and password that have access permissions to obtain and modify any data within a database. In this case, the program can use an application role to access the data it needs. By doing this, you can prevent DBAs from having to manage multiple accounts on the database level, and allow more complex security management within the application logic. Regardless of the authentication mode selected for server logins, application roles require the use of a login name, username, and password to access database information.
Database Roles
Within databases, users will be required to carry out specific functions. For small databases, a single individual might be responsible for all maintenance and administration. Large databases, on the other hand, will require multiple users to manage specific aspects
4:
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of the configuration. To make managing permissions easier, SQL Server includes built-in database roles that allow administrators to easily assign only the permissions necessary for completing specific tasks. Table 4-8 lists the built-in roles generated for new databases. Users can be assigned to any of these roles based on the requirements of their job functions. By default, whenever a user creates a database object, he or she is defined as the owner of that object. Other users with appropriate permissions may change database ownership. To remove a database owner, you must first either drop any objects owned by the user or transfer ownership to another user or role.
User-Defined Database Roles
db_owner db_accessadmin db_datareader db_datawriter db_ddladmin db_securityadmin
db_backupoperator db_denydatareader db_denydatawriter
Table 4-8.
Database Roles
Role
Permissions
Has full control of the database and its objects, as well as other maintenance and configuration activities. Can add or remove Windows NT groups, Windows NT users, and SQL Server users in the database. Can see any data from all user tables in the database. Can add, change, or delete data from all user tables in the database. Can add, modify, or drop objects in the database. Can manage roles and members of SQL Server database roles, and can manage statement and object permissions in the database. Can back up the database. Cannot see any data in the database, but can make schema changes. Cannot change any data in the database.
AM FL Y
Team-Fly
It s likely that the built-in database roles will cover many of your requirements. You can, however, create custom roles for common tasks that are performed within a database. With user-defined database roles, you can group users who have access to perform specific functions on tables, views, and other objects.
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CREATING A ROLE
To create a new user-defined database role, follow these steps:
1. In Enterprise Manager, expand the database for which you want to create a role. 2. Right-click Roles and select New Database Role. You ll see this dialog box:
3. For the Database Role Type, select Standard Role. Click Add to assign existing database users to this role. If you choose to make this an Application Role, it must be assigned a password. ADDING USERS TO A ROLE Once a role is created, you can assign users to it. A user can be assigned to multiple roles, according to the needed permissions. To add users to an existing role, expand the Database Roles folder within a database. Double-click an existing role and use the Add and Remove buttons to change assigned users. All users who are members of a role will inherit any permissions assigned to the role itself. Keep in mind that permissions are cumulative, with one exception: If a user is denied permissions at the user level or in any role, he or she will not have this permission regardless of other role permissions.
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