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Next, I m going to display the estimated query execution plan. This returns what operations SQL Server thinks it will perform without actually executing the query. To do this in SQL Server Management Studio, select Query and Display Estimated Execution Plan. This returns the query plan in the lower pane beneath the query (see Figure 28-8). The execution plan is represented by a tree that contains one or more operators.

-Wall: Enables a set of commonly used warning options for code constructs that the gfortran folks recommend avoiding: -Wunused-labels, -Waliasing, -Wsurprising, -Wnonstd-intrinsic, and -Wline-truncation. -Wconversion: Issues warnings about implicit conversions between different datatypes. -Werror: Causes any warnings that would have been issued by gfortran to be treated as errors, halting compilation. -Wimplicit-interface: Issues warnings when subroutines are called without a local or explicitly declared external interface. -Wnonstd-intrinsic: Issues warnings if the Fortran code uses an intrinsic that does not belong to the specified standard using the -std option. -Wsurprising: Issues warnings when suspicious code constructs are encountered. While technically legal, these usually indicate that an error has been made. This currently catches problems such as when an INTEGER SELECT construct has a case that can never be matched because its lower value is greater than its upper value, and when a LOGICAL SELECT construct has three or more CASE statements. -Wunderflow: Produces warnings when numerical constant expressions are encountered that have values less than the minimum allowable value of a specified type. -Wunused-labels: Generates warnings for any labels that are present in the Fortran code but which are never referenced.

The icons in Figure 28-8 represent each operator that SQL Server performs in order to produce the result set. An operator is an action SQL Server takes to execute a query. There are two types of operators: logical and physical. Logical operators describe an operation in conceptual terms, while physical operators are used to perform the actual implementation of the logical operator. For example, a logical operator may be INNER JOIN, but the physical method to perform an INNER JOIN is a Hash Match (one of the physical methods for joining two result sets).

Intrinsic functions (intrinsics) and extensions are the terms used to describe additional functions that are built into gfortran. Some intrinsics and extensions are true functions in the C language sense and can therefore be called directly in any code compiled using gfortran without using the standard CALL mechanism. They can also return a value like standard C function calls, rather than returning a value in a parameter passed to the subroutine. Table 3-1 shows the extensions that are provided by gfortran in GCC 4.1, which was the latest version at the time this book was written.

For a complete list of all available operators and their descriptions, see the SQL Server 2005 Books Online topic Graphical Execution Plan Icons (SQL Server Management Studio).

Using the following command line: convert -normalize input.jpg output.jpg will improve the contrast in this image significantly, as shown in Figure 6-24.

Abort()

One of the operations returned in this example s execution plan is the Clustered Index Scan. This tells us that the entire clustered index was read in order to return the result set, which makes sense because the query doesn t use a WHERE clause to filter the result set. The execution plan includes two different Cost % areas. The first Cost % can be found in the header of each query, where you see Query 1: Query cost (relative to the batch). This tells you what percentage of the query s duration was due to the specific query in the batch of queries. You ll also see percentage of cost underneath each of the icons in the execution plan results. In this example, the Clustered Index Scan accounted for 100% of the query s cost.

In addition to the estimated plan, you can also display the actual execution plan. This means the query itself is executed, returns results, and returns the execution plan as a separate tab. For example, to do this, select Query and Include Actual Execution Plan. This time you ll change the query to include a defined range of customers, ordering the results by the ContactID: SELECT CustomerID, ContactID, Demographics, ModifiedDate FROM Sales.Individual WHERE CustomerID BETWEEN 11000 AND 11020 ORDER BY ContactID You then execute the query as normal in order to return the results, and the actual execution plan. After executing the query, three tabs are spawned: one for the results, one for any messages, and one containing the execution plan. Click the Execution plan tab to see the results (see Figure 28-9).