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ALTER PROC dbo.GetOrders @d AS INT = 0 AS DECLARE @odate AS DATETIME; SET @odate = DATEADD(day, -@d, CONVERT(VARCHAR(8), CURRENT_TIMESTAMP, 112)); SELECT orderid, custid, empid, orderdate FROM Sales.Orders WHERE orderdate >= @odate OPTION(RECOMPILE); GO

This, in effect, calls the WatchListServlet via the web container, which places the JDOM Document in which we are interested into the request object. We then access the Document in the doFilter method.

Run the procedure with selective and nonselective values:

1 2 3 4

EXEC dbo.GetOrders @d = 1; EXEC dbo.GetOrders @d = 365;

Examine the execution plans for the two invocations shown in Figure 3-4, and observe that both got optimal plans the first for a selective filter and the second for a nonselective one .

HttpServletRequest httpRequest = (HttpServletRequest) request; Document outputDoc = (Document) httpRequest.getAttribute("quoteList");

Note that you might face similar problems to variable sniffing when changing the values of input parameters before using them in queries . For example, say you define an input parameter called @odate and assign it with a default value of NULL . Before using the parameter in the query s filter, you apply the following code:

SET @odate = COALESCE(@odate, '19000101');

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The query then filters orders where orderdate >= @odate . If optimization happens at the batch level, when the query is optimized the optimizer is not aware of the fact that @odate has undergone a change, and it optimizes the query with the original input (NULL) in mind . You will face a similar problem to the one I described with variables, and you should tackle it using similar logic . Ironically, you may end up facing kind of an inverse problem to the variable sniffing one with parameters . As mentioned and demonstrated earlier, SQL Server does support parameter sniffing .

String outputFormat = getOutputFormat(httpRequest); String locale = getLocaleString(httpRequest); String stylesheetPath = getStylesheet(outputFormat, locale);

In the previous section I described scenarios in which the optimizer doesn t sniff variable values or the correct parameter values and ends up generating an execution plan based on atypical inputs I explained that if you knew that plan reuse was a good thing for the query, and you also knew which static values the query should be optimized for, you could use the OPTIMIZE FOR hint and provide those static values as the variable or parameter values Another scenario that you might face is one in which the majority of the invocations of your procedure are with typical inputs, but occasionally the procedure is invoked with atypical ones You do know that the query would benefit from plan reuse provided that the cached plan would be the one that was optimized for the typical inputs .

But the risk is that upon first invocation of the procedure after service restart, recompile, or any other reason the procedure will be invoked with atypical inputs, and you will end up with a cached plan that is suboptimal for the typical invocation of the stored procedure If you have static input values that adequately represent the common case both currently and in the future you can use the OPTIMIZE FOR hint and specify those values But what if there are no such static values SQL Server 2008 enhances the OPTIMIZE FOR hint, allowing you to indicate that you want the optimizer to optimize the query for unknown variable or parameter input values With this option you tell SQL Server to use its existing algorithms based on statistical data to optimize the query, as opposed to attempting to sniff the inputs .

For example, recall from earlier discussions that I mentioned that for a range filter the optimizer uses a selectivity estimate of 30 percent when it cannot sniff the input By using the OPTIMIZE FOR UNKNOWN hint, you tell the optimizer that you actually want it to use such estimates even in scenarios where it could technically sniff the inputs ..

If the statement is parameterized either explicitly (for example, when submitted through sp_executesql), or implicitly internally by SQL Server, specify the parameterized form in the @stmt argument and the parameters declaration in the @params argument . For statements that are parameterized using sp_executesql, specify the exact form used in the @stmt and @ params argument of sp_executesql in the corresponding @stmt and @params arguments of sp_create_plan_guide . For statements that get parameterized internally by SQL Server, use the sp_get_query_template procedure to create their parameterized form . In the next section I ll demonstrate how to create a SQL plan guide for a parameterized query .

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