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If your queries have been parameterized at the client using the prepare and execute method, the metadata shows you prepared queries, just as for queries that are parameterized at the server, either automatically or by using sp_executesql. However, queries that are not parameterized (either under simple or forced parameterization) do not have any corresponding adhoc shell queries in cache, containing the unparameterized actual values; they have only the prepared plans. There is no guaranteed way to detect whether a prepared plan was prepared by SQL Server using simple or forced parameterization or by the developer through client-side parameterization. If you see a corresponding shell query, you can know that the query was parameterized by SQL Server, but the opposite is not always true. Because the shell queries have zero cost, they are among the rst candidates to be removed when SQL Server is under memory pressure. So a lack of a shell query might just mean that adhoc plan was already removed from cache, not that there never was a shell query.

When looking at the metadata in sys.dm_exec_cached_plans, we ve seen compiled plans with objtype values of Adhoc and Prepared. The third objtype value that we will be discussing is Proc, and you will see this type used when executing stored procedures, user-de ned scalar functions, and multistatement TVFs. With these objects, you have full control over what values are parameters and what their data types are when executing these objects.

Stored procedures and user-de ned scalar functions are treated almost identically. The metadata indicates that a compiled plan with an objtype value of Proc is cached and can be reused repeatedly. By default, the cached plan is reused for all successive executions, and as we ve seen with the sp_executesql, this is not always desirable. However, unlike the plans cached and reused with sp_executesql, you have an option with stored procedures and user-de ned scalar functions to force recompilation when the object is executed. In addition, for stored procedures, you can create the object so that a new plan is created every single time it is executed. To force recompilation for a single execution, you can use the EXECUTE . . . WITH RECOMPILE option. Here is an example in the Northwind2 database of forcing recompilation for a stored procedure:

Schemas and Document Type Definitions (DTDs) form the meta-data that enables an XML document to be self-describing Although they have very different constructs, schemas and DTDs serve the same general purpose: to define the rules and data elements within an XML document They attach context to XML documents that can be read by humans and by machines The specific flavor of XML syntax that a given DTD or schema defines is called a vocabulary The vocabulary may cover a set of XML documents or only one document Although DTDs are the more mature technology, the World Wide Web Consortium (W3C) is pushing the specification and acceptance of schemas Each construct has advantages, but advocates believe that schemas provide the superior extensibility and compatibility with the XML format

When one of the steps says to add a control and then name it XYZ, it means you need to add the control onto the design surface, and then go to the Properties window and change the (Name) property of the control to XYZ.

USE Northwind2; GO CREATE PROCEDURE P_Customers @cust nvarchar(10) AS SELECT RowNum, CustomerID, OrderDate, ShipCountry FROM BigOrders WHERE CustomerID = @cust; GO

9

DBCC FREEPROCCACHE; GO SET STATISTICS IO ON; GO EXEC P_Customers 'CENTC'; GO EXEC P_Customers 'SAVEA'; GO EXEC P_Customers 'SAVEA' WITH RECOMPILE;

If you look at the output from STATISTICS IO, you see that the second execution used a suboptimal plan that required more pages to be read than would be needed by a table scan. This is the situation that you may have seen referred to as parameter snif ng. SQL Server is basing the plan for the procedure on the rst actual parameter, in this case, CENTC, and then subsequent executions assume the same or a similar parameter is used. The third execution uses the WITH RECOMPILE option to force SQL Server to come up with a new plan, and you should see that the number of logical page reads is equal to the number of pages in the table. If you look at the results from running the usecounts query, shown here, you should see that the cached plan for the P_Customers procedure has a usecounts value of 2, instead of 3.

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CREATE PROCEDURE P_Customers @cust nvarchar(10) AS SELECT RowNum, CustomerID, OrderDate, ShipCountry FROM BigOrders WHERE CustomerID = @cust

The plan developed for a procedure executed with the WITH RECOMPILE option is considered valid only for the current execution; it is never kept in cache for reuse.

Schema may be an unfortunate choice of terms because database theory also uses the term schema In fact, the word schema is used in different modeling disciplines and means something different in each context An XML schema has no relationship to a database schema An XML schema is a construct used to represent the data elements, attributes, and their relationships