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The default role assigned to all database users. If you want all database users to have specific permissions, assign the permissions to the public role Designed for users who need to add or remove logins in a data Designed for users who need to back up a database. base.

Designed for users who need to view data in a database. Mem bers of this role can select all data from any user table in the database. Designed for users who need to add or modify any data in any user table in the database. Members of this role can perform these tasks on any objects in the selected database: DELETE, INSERT, and UPDATE.

A search argument (SARG) is a filter expression that is used to limit the number of rows returned by a query and that can utilize an index seek operation which will substantially increase the performance of the query. Typically, a filter expression is not a SARG if the column from the table is changed in any way (such as LEFT(Name, 1) = 'A'). If the filter is not a SARG and no other SARGs exist in the query, this will result in an index or table scan. A scan refers to the scan of the entire table or index. Instead of a scan, you want a seek to be performed. A seek implies the use of the index s balanced tree to find the values for which the query searched. For example, in the following query, the OrderDateIndex index will be scanned (rather than seeked). The execution plan for the following query is shown in Figure 7-1.

11

Designed for users who need to perform tasks related to the data definition language (DDL) for SQL Server. Members of this role can issue any DDL statement except GRANT, REVOKE, or DENY. Designed to restrict access to data in a database by login. Members of this role cannot read any data in user tables within a database.

Designed to restrict modifications permissions in a database by login. Members of this role cannot add, modify, or delete any data in user tables within a database. Designed for users who need complete control over all aspects of the database.

USE AdventureWorks; CREATE NONCLUSTERED INDEX OrderDateIndex ON Sales.SalesOrderHeader (OrderDate); SELECT COUNT(*) FROM Sales.SalesOrderHeader WHERE YEAR(OrderDate) = 2004;

Exam Tip To simplify administration of SQL Server in an enterprise environment, you should place the Windows accounts of all domain users who require similar privileges to SQL Server into a single Windows group account. Then assign an appropriate server role to that Windows group account. In general, you should avoid assigning roles directly to individual Windows user accounts.

You can verify information about credentials by using the sys.credentials security catalog view, which returns one row for each credential in the server. The information contained in each row is listed in Table 11-7.

If the query is instead rewritten so that the OrderDate column is not changed, an index seek operation will be used instead of a scan. The execution plan for the following query is shown in Figure 7-2.

Securables are entities within SQL Server to which you can assign permissions. The three top-level securables are server, database, and schema. Each of these securables contains other securables, which in turn can contain other securables. These nested

hierarchies are referred to as scopes. The server scope includes securables such as server instances, databases, endpoints, logins, and server roles. Examples of secur ables within the database scope include application roles, database roles, schemas, and users. Securables within the schema scope include functions, procedures, tables, and views.

SELECT COUNT(*) FROM Sales.SalesOrderHeader WHERE OrderDate >= '20040101' AND OrderDate < '20050101';

You can use the Transact-SQL IS_SRVROLEMEMBER and HAS_PERMS_BY_NAME functions to verify the permissions and privileges of security principals in SQL Server 2005. The IS_SRVROLEMEMBER function returns a value of 1 if the current login is a mem ber of the specified fixed server role. For example, the following statement indicates whether the login for the current user is a member of the sysadmin fixed server role: