upc internet provider Note A variable is not the same as a parameter, even though they are written the same way. in VB.NET

Creation UPC-A Supplement 2 in VB.NET Note A variable is not the same as a parameter, even though they are written the same way.

Note A variable is not the same as a parameter, even though they are written the same way.
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Because a procedure is compiled only when it is being executed, SQL Server always uses a speci c parameter value. Problems arise when the previously compiled plan is then used for different parameters. However, for a local variable, the value is never known when the statements using the variable are compiled unless the RECOMPILE hint is used.
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OPTIMIZE FOR The OPTIMIZE FOR hint tells the optimizer to optimize the query as if a particular value has been used for a variable or parameter. Execution uses the real value. Keep in mind that the OPTIMIZE FOR hint does not force a query to be recompiled. It only instructs SQL Server to assume a variable or parameter has a particular value in those cases in which SQL Server has already determined that the query needs optimization. As the OPTIMIZE FOR hint was discussed in 8, we won t say any more about it here. KEEP PLAN The KEEP PLAN hint relaxes the recompile threshold for a query, particularly for queries accessing temporary tables. As we saw earlier in this chapter, a query accessing a temporary table can be recompiled when as few as six changes have been made to the table. If the query uses the KEEP PLAN hint, the recompilation threshold for temporary tables is changed to be the same as for permanent tables. KEEPFIXED PLAN The KEEPFIXED PLAN hint inhibits all recompiles because of optimality issues. With this hint, queries are recompiled only when forced, or if the schema of the
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9
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underlying tables is changed, as described in the section entitled Correctness-Based Recompiles, earlier in this chapter. PARAMETERIZATION The PARAMETERIZATION hint overrides the PARAMETERIZATION option for a database. If the database is set to PARAMETERIZATION FORCED, individual queries using the PARAMETERIZATION hint can avoid that and be parameterized only if they meet the strict list of conditions. Alternatively, if the database is set to PARAMETERIZATION SIMPLE, individual queries can be parameterized on a case-by-case basis. Note however that the PARAMETERIZATION hint can only be used in conjunction with plan guides, which we discuss shortly. USE PLAN The USE PLAN hint was discussed in 8, as a way to force SQL Server to use a plan that you might not be able to specify using the other hints. The plan speci ed must be in XML format and can be obtained from a query that uses the desired plan by using the option SET SHOWPLAN_XML ON. Because USE PLAN hints contain a complete XML document in the query hint, they are best used within plan guides, which are discussed in the next section.
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Although it is recommended in most cases that you allow the Query Optimizer to determine the best plan for each of your queries, there are times when the Query Optimizer just can t come up with the best plan and you may nd that the only way to get reasonable performance is to use a hint. This is usually a straightforward change to your applications, once you have veri ed that the desired hint is really going to make a difference. However, in some environments, you have no control over the application code. In cases when the actual SQL queries are embedded in inaccessible vendor code or when modifying vendor code would break your licensing agreement or invalidate your support guarantees, you might not be able to simply add a hint onto the misbehaving query. Plan guides, introduced in SQL Server 2005, provide a solution by giving you a mechanism to add hints to a query without changing the query itself. Basically, a plan guide tells the Optimizer that if it tries to optimize a query having a particular format, it should add a speci ed hint to the query. SQL Server supports three kinds of plan guides: SQL, Object, and Template, which we explore shortly. Plan guides are available in the Standard, Enterprise, Evaluation, and Developer editions of SQL Server. If you detach a database containing plan guides from a supported edition and attach the database to an unsupported edition, such as Workgroup or Express, SQL Server does not use any plan guides. However the metadata containing information about plan guides is still available.
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