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Designed for users who need to manage logins, create database permissions, and read error logs. Members of this role can add members to secu rityadmin; grant, deny, and revoke server-level and database-level permissions; reset passwords; and read the error logs. In addition, they can also perform these tasks: sp_addlinkedsrvlogin, sp_addlogin, sp_defaultdb, sp_defaultlanguage, sp_denylogin, sp_droplinkedsrvlogin, sp_droplogin, sp_grantlogin, sp_helplogins, sp_remoteoption, and sp_revokelogin.

A thick arrow represents a large number of rows moving from one operation in the execution plan to another. The greater the number of rows transferred from one operation to another, the thicker the arrow. If a hash operation is used to handle clauses such as GROUP BY and JOIN, it often means that an appropriate index did not exist to optimize the query.

Designed for users who need to set server-wide configuration options and shut down the server. Members of this role can add members to serveradmin and can perform these other tasks: DBCC FREEPROCCACHE, RECONFIGURE, SHUTDOWN, sp_configure, sp_fulltext_service, and sp_tableoption. Designed for users who need to manage linked servers and control startup procedures. Members of this role can add members to setupadmin; can add, drop, and configure linked servers; and can control startup procedures. Designed for users who need complete control over SQL Server and installed databases. Members of this role can perform any activity in SQL Server.

The sp_helpuser stored procedure does not return information about SQL Server 2005 securables. You should use sys.database_principals for this purpose.

For the 70-443 exam, you need to know the difference between the various built-in server roles in SQL Server 2005.

7

At the database level, security principals include database users, application roles, and database roles. Database users are entities that are associated with Windows or SQL Server logins and that are assigned a configured set of permissions and privileges to specific objects (such as tables) in the database. Although you can create custom database users, data bases in SQL Server also include default, or built-in, users. These built-in users include guest, dbo, INFORMATION_SCHEMA, and sys. The guest user is a special user that you can add to a database to enable anyone with a valid SQL Server login to access the database. The database owner, or dbo, is a special type of database user (generally the creator of the database) that is granted all permissions and privileges on the database including the right to assign permissions to other users. The INFORMATION_SCHEMA and sys users are used by the system internally to refer ence views of metadata in a database. Application roles enable you to create password-protected roles for specific applica tions. For example, a user could connect to a database through a Web-based applica tion that could activate the role and provide the user with the role s permissions and privileges. You can use database roles to assign permissions at the database level. For example, you could create a role called Users that allows users to SELECT, INSERT, and UPDATE specific tables in the database. You could then assign this role to specific

3

Table 7-3

A credential is a record containing authentication information needed to connect to a resource outside SQL Server. Most credentials consist of a Windows login name and password. Credentials allow users who connect to SQL Server using SQL Authentication to connect to Windows or other resources outside of SQL Server. After creating a credential, you can use the Login Properties (General Page) in SQL Server Object Explorer to map it to a login. You can map a single credential to multiple SQL Server logins, but you can map a SQL Server login to only one credential. System credentials are created automatically and are associated with specific endpoints. Their names begin with '##'.

users instead of assigning permissions to each user separately. SQL Server also includes the following predefined database roles for each database:

A sort isn t necessarily bad, but if it is a high percentage of the query cost, you should consider whether an index can be built to remove the need for the sort operation. The plan with fewer operations is typically the better-optimized plan. A clustered index scan and a table scan indicate that no appropriate index can be used to optimize the query.