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FOR BROWSE OPTION <query hints> DISTINCT TOP WAITFOR statements GROUP BY, HAVING, COMPUTE Full-text predicates Subqueries FROM clause of a SELECT statement has a table-valued method or full-text table or OPENROWSET or OPENXML or OPENQUERY or OPENDATASOURCE Comparison predicate of the form EXPR <> a non-null constant
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Simple parameterization is also disallowed for data modi cation statements that use the following constructs:
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If your application uses many similar queries that you know bene t from the same plan but are not autoparameterized, either because SQL Server doesn t consider the plans safe or because they use one of the disallowed constructs, SQL Server 2008 provides an alternative. A database option called PARAMETERIZATION FORCED can be enabled with the following command:
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ALTER DATABASE <database_name> SET PARAMETERIZATION FORCED;
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Once this option is enabled, SQL Server treats constants as parameters, with only a very few exceptions. These exceptions, as listed in SQL Server Books Online, include the following:
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INSERT . . . EXECUTE statements. Statements inside the bodies of stored procedures, triggers, or user-de ned functions. SQL Server already reuses query plans for these routines. Prepared statements that have already been parameterized on the client-side application. Statements that contain XQuery method calls, in which the method appears in a context in which its arguments would typically be parameterized, such as a WHERE clause. If the method appears in a context in which its arguments would not be parameterized, the rest of the statement is parameterized.
Microsoft SQL Server 2008 Internals
Statements inside a T-SQL cursor. (SELECT statements inside API cursors are parameterized.) Deprecated query constructs. Any statement that is run in the context of ANSI_PADDING or ANSI_NULLS set to OFF. Statements that contain more than 2,097 literals. Statements that reference variables, such as WHERE T.col2 >= @p. Statements that contain the RECOMPILE query hint. Statements that contain a COMPUTE clause. Statements that contain a WHERE CURRENT OF clause.
You need to be careful when setting this option on for the entire database because assuming that all constants should be treated as parameters during optimization and then reusing existing plans frequently gives very poor performance. An alternative that allows only selected queries to be autoparameterized is to use plan guides, which are discussed at the end of this chapter. In addition, plan guides can also be used to override forced parameterization for selected queries, if the database has been set to PARAMETERIZATION FORCED.
Drawbacks of Simple Parameterization
A feature of autoparameterization that you might have noticed in the output from the usecount query shown previously is that SQL Server makes its own decision as to the data type of the parameter, which might not be the data type you think should be used. In the earlier example, looking at the employees table, SQL Server chose to assume a parameter of type tinyint. If we rerun the batch and use a value that doesn t t into the tinyint range (that is, a value less than 0 or larger than 255), SQL Server cannot use the same autoparameterized query. The batch below autoparameterizes both SELECT statements, but it is not able to use the same plan for both queries. The output from the usecount query should show two adhoc shell queries, and two prepared queries. One prepared query has a parameter of type tinyint, and the other is smallint. As strange as it may seem, even if you switch the order of the queries and use the bigger value rst, you get two prepared queries with two different parameter data types:
USE Northwind2; GO DBCC FREEPROCCACHE; GO SELECT FirstName, LastName, Title FROM Employees WHERE EmployeeID = 6; GO SELECT FirstName, LastName, Title FROM Employees WHERE EmployeeID = 622; GO SELECT usecounts, cacheobjtype, objtype, [text] FROM sys.dm_exec_cached_plans P CROSS APPLY sys.dm_exec_sql_text (plan_handle) WHERE cacheobjtype = 'Compiled Plan' AND [text] NOT LIKE '%dm_exec_cached_plans%'; GO
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