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SQL Server uses a method known as parameter sniffing to further optimize SP calls. During compilation or recompilation of an SP, SQL Server captures the parameters used and passes the values along to the optimizer. The optimizer then generates and caches a query plan optimized for those parameters. This can actually cause problems in some cases for example, when your SP can return wildly varying numbers of rows based on the parameters passed in. Listing 6-13 shows a simple SP that retrieves all products from the Production.Product table with a Name like the @Prefix parameter passed into the SP . Listing 6-13. Simple Procedure to Demonstrate Parameter Sniffing CREATE PROCEDURE Production.GetProductsByName @Prefix NVARCHAR(100) AS BEGIN SELECT p.Name, p.ProductID FROM Production.Product p WHERE p.Name LIKE @Prefix; END GO Calling this SP with the @Prefix parameter set to % results in a query plan optimized to return 504 rows of data with a nonclustered index scan, as shown in Figure 6-8.

The core of SQL is defined by statements that perform five major functions: querying data stored in tables, manipulating data stored in tables, managing the structure of tables, controlling access to tables, and managing transactions. All of these subsets of SQL are defined following: Querying: The SELECT query statement is a complex statement. It has more optional clauses and vendor-specific tweaks than any other statement, bar none. SELECT is concerned simply with retrieving data stored in the database. Data Manipulation Language (DML): DML is considered a sublanguage of SQL. It is concerned with manipulating data stored in the database. DML consists of four commonly used statements: INSERT, UPDATE, DELETE, and MERGE. DML also encompasses cursor-related statements. These statements allow you to manipulate the contents of tables and persist the changes to the database. Data Definition Language (DDL): DDL is another sublanguage of SQL. The primary purpose of DDL is to create, modify, and remove tables and other objects from the database. DDL consists of variations of the CREATE, ALTER, and DROP statements. Data Control Language (DCL): DCL is yet another SQL sublanguage. DCL s goal is to allow you to restrict access to tables and database objects. DCL is composed of various GRANT and REVOKE statements that allow or deny users access to database objects. Transactional Control Language (TCL): TCL is the SQL sublanguage that is concerned with initiating and committing or rolling back transactions. A transaction is basically an atomic unit of work performed by the server. The BEGIN TRANSACTION, COMMIT, and ROLLBACK statements comprise TCL.

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Once you have configured your mail connection settings, click the OK button, and use the Save button to commit your changes. If you have altered the settings, restart the service, and test that your invitations and acceptances function (these are explained further later in this chapter).

up everything on this computer. If you select this option, the backup job you create will include the system state data along with all programs and data on the machine. This is a convenient way to create a backup plan to protect an entire server in one shot.

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