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Stored procedures have several performance advantages over ad hoc queries. Stored procedures are cached in a compiled form on the database server, so when they need to be used, the server does not have to parse and recompile them again. A developer can optimize a stored procedure s code so that every user will use the best possible method to perform an action.

reference does not already exist, right-click Database References and select New Database Reference to create one that points to the Asset database.

When SQL Server needs to locate data, it calls the access methods manager. The access methods manager sets up and requests scans of data pages and index pages and then prepares the OLE DB rowsets to return to the relational engine. It contains services to open a table, retrieve qualified data, and update data. The access methods manager does not actually retrieve the pages; it makes the request of the buffer

One sign of a well-designed database system is that it prevents users from directly accessing the tables and forces them to use stored procedures to perform specific functions. It is also easier to manage a set of stored procedures by functionality than to manage table- and column-level permissions.

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We have taken a detailed look at the world of stored procedures in this chapter Stored procedures are database objects that encapsulate collections of Transact-SQL statements on the server for later repetitive use As do their counterparts in other programming languages (functions and procedures), they support the use of input and output parameters and return values Since the return value is limited to integer datatypes, parameters are mostly used to return success codes for the stored procedure By placing Select statement(s) inside stored procedures, developers can return one (or more) resultset(s) from a stored procedure To run a stored procedure, use the Execute statement This statement must be supplied with a list of input and output parameters Transact-SQL supports passing parameters by position and by name We have described how batches and stored procedures are parsed, compiled, and executed in Microsoft SQL Server.

This process is similar to compilation in standard programming languages The end result is an execution plan that is cached in the procedure cache in the hope that somebody else will need it, that it will be reused, and that there will not be a need to parse and compile it again Sometimes developers want to force compilation of a stored procedure It is possible to force compilation during the creation of a stored procedure, during the execution of a stored procedure, or as needed (for example, when a new index is added to a table) Stored procedures are saved in system tables (sysobjects and syscomments) to allow SQL Server to manipulate them and to preserve them during shutdowns or when they are removed from the procedure cache A developer can decide to protect his or her intellectual property and use encryption to hide a stored procedure s source code.

Nobody (not even the system administrator) will be able to access this code, but SQL Server will have no problem with it, even during upgrades The use of Transact-SQL statements for manipulation of stored procedures and other database objects might seem outdated.

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Figure 11-1

compared to the ease of use provided by Enterprise Manager. Unfortunately, Enterprise Manager does not provide all the functionality of Transact-SQL, and in some cases, due to errors or environmental considerations, you will not be able to use it. You do not have to use Transact-SQL statements in your everyday work, but you have to be familiar with them to be able to use them when you have to. You should try to go through a complete development cycle using both Enterprise Manager and Query Analyzer. There is no need to learn details like the syntax of each stored procedure or statement, but you have to know that there is a stored procedure that can perform the function that you need performed, and that you will be able to find it in SQL Server Books Online.

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