qr code generator in vb.net Figure 2-8. Display Estimated Execution Plan and Include Actual Execution Plan options in SSMS in .NET

Creation QR Code 2d barcode in .NET Figure 2-8. Display Estimated Execution Plan and Include Actual Execution Plan options in SSMS

Figure 2-8. Display Estimated Execution Plan and Include Actual Execution Plan options in SSMS
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There is a significant difference between the Display Estimated Execution Plan and Include Actual Execution Plan options. If you select the former, a picture showing the graphical showplan of the query or batch in the query window is shown almost immediately (with the speed depending on the compilation time and whether the plan is already cached or not) under the Execution Plan tab in the result portion of SSMS, as shown in Figure 2-9 .
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Figure 2-9. Display Estimated Execution Plan
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Activating the Include Actual Execution Plan button has no immediate action associated with it. It only changes the state of SSMS to include the run-time showplan with any executed statement or batch. I activated the button, and then executed the same query as above by clicking the Execute button with the red exclamation mark. The additional Results tab appeared among the result windows alongside the Messages and Execution Plan tabs in the lower half of the SSMS window. If you select the tabs one by one, you will see that the Results window contains the query result and the Execution Plan window has a plan that is a similar plan to the one just shown in Figure 2-9 . The differences in the plan become apparent only after you investigate the contents of the information inside the individual operators. In Figure 2-10 , I hovered the mouse pointer over the Nested Loops operator, which brought up additional information that is not present in the Estimated Planfields and values for "Actual Number Of Rows," "Actual Rebinds," and "Actual Rewinds" (all of which will be explained later).
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Figure 2-10. Include Actual Execution Plan
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The rows flow from the right to the left, and when joining two tables, the outer table is above the inner table in the graphical showplan. If you right-click in the Execution Plan window, you will see a pop-up window with the choices shown in Figure 2-11 . I used the Zoom To Fit option to produce the pictures of the plans in Figures 2-9 and 2-10 . The Properties option will display properties of the operator you select prior to the right-click, similar to the example shown for the Nested Loops operator in Figure 2-10 . Probably the least obvious action is associated with the Save Execution Plan As option. If you make this choice, SSMS prompts you for a file location in which to store the XML showplan (not the graphical representation of the plan). The default extension for the file name is sqlplan.
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Figure 2-11. Execution plan options
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Run-Time Information in Showplan
SQL Server collects the run-time information during the query execution. As I explained previously, XML showplan is the most complete form of a query plan. Therefore, we will start examining the additional run-time information returned in the XML showplan first. Then we will talk about the output of the SET STATISTICS PROFILE command, and finally, we'll discuss the SQL Server Profiler's run-time showplan information.
SET STATISTICS XML ON|OFF
There are two kinds of run-time information in the XML showplan: per SQL statement and per thread. If a statement has a parameter, the plan contains the ParameterRuntimeValue attribute, which shows the value for each parameter when the statement is executed. This might differ from the value used to compile the statement under the ParameterCompiledValue attribute, but this attribute is in the plan only if the optimizer knows the value of the parameter at the optimization time and is true only for parameters passed to stored procedures. Next, we have the DegreeOfParallelism attribute, which shows the actual degree of parallelism (or DOP, which is the number of concurrent threads working on the single query) of the execution. This, again, might be different from the compile-time value. The compile-time value is not captured in the query plan, but it is always equal to half the number of processors available to SQL Server unless the number of processors is 2in which case, the compile-time DOP value will be 2 as well. The optimizer is considering half of the CPUs because the DOP at the execution time will be adjusted based on the workload at the time the execution starts; it might end up being any number between 1 and the number of processors. Regardless of the final choice for DOP, the same parallel plan is used. If a parallel plan ends up being executed with DOP = 1, SQL Server will remove the Exchange operators from the query plan when creating the execution context. The MemoryGrant attribute shows actual memory given to the query for execution in kilobytes. SQL Server uses this memory to build the hash tables for hash joins or to perform a sort in the memory. The element RunTimeCountersPerThread contains five attributes, each with one value per thread: ActualRebinds , ActualRewinds , ActualRows , ActualEndofScans , and ActualExecutions . 3 describes how SSMS shows Actual Number Of Rows and Actual Rebinds And Actual Rewinds in the Operator information ToolTip box of a graphical showplan. The ToolTip box shows cumulative (added across all executions of all threads) values for each of the ActualRows , ActualRebinds , and ActualRewinds values from the XML showplan. The ActualExecutions value tells us how many times the operator has been initialized on each of the threads. If the operator is a scan operator, the ActualEndofScans count shows how many times the scan reached the end of the set. Consequently, subtracting ActualEndofScans from ActualExecutions tells us how many times the operator didn't scan the whole setthis might happen, for example, if TOP in the SELECT restricts the number of returned rows and the output set is collected before the scan reaches the end of the table. Similarly, in the case of a Merge Join, if one of the sets is exhausted we don't need to continue scanning the other set because there cannot be any more matches. The XML showplan might also contain warnings. These are events generated either during compilation or during execution. Examples of compiler-generated warnings are missing statistics and a missing join predicate. Examples of run-time warnings are a hash bailout and an exchange spill. If you encounter a warning in your query plan, you should consult the "Errors and Warnings Event Category" in Books Online to find more information.
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