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A couple of years ago, I did a consulting job for a big publishing company where long delays in the database happened when orders were received. The company had already investigated their indexing and were not able to find any obvious problems. I started by running SQL Trace to find what was actually taking so much time and found that a simple INSERT statement was causing the delays. I then verified that the INSERT was not blocked by any locks. Finally, I checked whether the table had any triggers defined on it. It turned out that the table did in fact have an AFTER INSERT trigger defined on it. After reviewing the trigger, it was obvious that the trigger was causing the massive delays; the trigger was actually performing aggregations based on the entire order table. After verifying with the customer that a new approach would still solve the business problem, we went ahead and removed the trigger and created an agent that ran every 10 minutes and performed the exact same function as the trigger used to do, for every INSERT. By removing the trigger, the INSERT statements were now executing with little to no delay. I bring up this point so that you will think about whether other issues are involved that affect performance rather than just the query itself or the index structures that it uses.

'VB <WebServiceBinding(ConformsTo:=WsiProfiles.BasicProfile1_1)> _ //C# [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]

3. Add the following code below the last Web method in the MyWebService.asmx class file:

Tuning queries is an important task for a database developer. Throughout this lesson, you learn about several options for optimizing queries.

Now let s create a Windows application and demonstrate how to manipulate the defini tion as well as the columns and data in a DataGridView control. 1. Create a Windows application and name it DataGridViewExample. 2. Open the Data Sources window (on the Data menu, select Show Data Sources).

'VB <WebMethod(Description:="Get a Return Value, but use the default use of Literal")> _ Public Function GetReturnValue(ByVal parm1 As Integer, ByVal parm2 As String) As String Return Convert.ToString(parm1) + parm2 End Function <SoapDocumentMethod(Use:=SoapBindingUse.Encoded)> _

After this lesson, you will be able to:

<WebMethod(Description:="Get a Return Value, but set the use attribute to be encoded")> _

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Public Function GetReturnValueEncoded(ByVal parm1 As Integer, _

Know more about what affects query performance. Know how to measure query performance. Know how to write more efficient queries.

//C# [WebMethod(Description = "Get a Return Value, but use the default use of Literal")]

3. Click Add New Data Source to start the Data Source Configuration Wizard. 4. Leave the default of Database and click Next. 5. Select (or create) a connection to the Northwind sample database and click Next. 6. Expand the Tables node. Select the Customers table, and then click Finish. 7. Drag the Customers node from the Data Sources window onto the form. At this point, you can actually run the application, and the form appears with the Customers table loaded into the DataGridView. 8. Drag two buttons onto the form below the DataGridView and set the following properties:

public string GetReturnValue(int parm1, string parm2)

One of the most important aspects of tuning queries is measuring performance. When measuring performance, you need to know what to actually measure that is, what metric to use. In SQL Server, there are three main metrics to consider: query cost, page reads, and query execution time.

return Convert.ToString(parm1) + parm2;

The query cost is typically (but not always, as you will soon see) a good metric to use when comparing query performance. It is an internal metric used in SQL Server that takes into account both CPU and input/output (I/O) resources used by the query. The lower the query cost, theoretically, the better the query performance is. The query cost is not affected by issues such as resource contention or waiting for locks. The query cost is typically a good performance measurement, but when certain items are used in a query, such as scalar user-defined functions (UDFs) and Common Language Runtime (CLR) routines, the cost for these items is not calculated, which renders the query cost lower than a truly accurate assessment. This is why it is called estimated query cost.

[SoapDocumentMethod(Use = SoapBindingUse.Encoded)]

Button1:

[WebMethod(Description = "Get a Return Value, but set the use attribute to be encoded")]

Page reads represents the number of 8-kilobyte (KB) data pages accessed by the SQL Server storage engine while executing a query. You can retrieve this metric by executing SET STATISTICS IO ON. This causes each query execution to output something similar to the following in the Messages tab of the query window:

public string GetReturnValueEncoded(int parm1, string parm2)

Button2:

return Convert.ToString(parm1) + parm2;

Table 'Customer'. Scan count 2, logical reads 136, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0. Table 'SalesOrderHeader'. Scan count 121, logical reads 822, physical reads 5, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.

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