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row count) and not be noticed by Oracle as a popular value. Worse still, every very popular value takes up more than its fair share of buckets a small number of very popular rows could ensure that Oracle misses dozens of rows that you would like to classify as popular. There are times when you may have to fall back on creating an artificial frequency histogram, because that s the best you can do to describe your data set to Oracle.

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Another advantage of components is the availability of dynamic properties, which can be configured to load their values from the application configuration file, Web.config. In VS .NET, dynamic properties live in a special section under the Configurations heading in the Properties browser. Once again, the designer works together with the component to generate the appropriate code, this time for retrieving data from Web.config. Let s see how that happens. Try It Out: Configure a Dynamic Connection String In this example, you will modify the SqlConnection component you just added to use a dynamic property for the connection string. This is a significant improvement over the approach you ve been using so far, which involved hard-coding the value everywhere you needed access to the database. 1. Open the Components.aspx web form in the Design view and select the cnFriends component. 2. In the Properties browser, expand the (DynamicProperties) element. Click the ellipsis button next to ConnectionString, and then check the option to map the property to a key in the configuration file, as shown in Figure 5-2. Then click OK. In the Properties browser, you ll see that a small icon has appeared next to the ConnectionString property under the Data category, indicating that this is now a dynamic property. How It Works The (DynamicProperties) section in the Properties browser works in conjunction with components, showing only the properties that can be dynamically configured. If you now take a look at the Web.config file, you ll see that something similar to the following element has been added: <appSettings> <!-User application and configured property settings go here.--> <!-Example: <add key="settingName" value="settingValue"/> --> <add key="cnFriends.ConnectionString" value="[YOUR CONNECTION STRING]" /> </appSettings>

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When the optimizer takes advantage of a height balanced histogram to work out cardinality, it adopts one of three major strategies Strategy 1 for calculating selectivity/cardinality: For column = constant, the constant may be a popular value A popular value is one that fills at least one bucket, and therefore results in a gap in user_tab_histograms view If Oracle spots such a value, it does its arithmetic by buckets For example, in the preceding, the value 77 appears at endpoint 69, and the previous value (76) appears at endpoint 67: consequently Oracle considers 77 to be a popular value that spans 2 buckets out of 75 The selectivity of 77 is therefore 2/75, and the cardinality is 3,240 * 2/75 = 864 and with autotrace we see Execution Plan (920.

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Figure 5-2. Setting a dynamic property for a component If you look again at the code-behind page, you ll see that there have been some changes there, too: <System.Diagnostics.DebuggerStepThrough()> _ Private Sub InitializeComponent() Dim configurationAppSettings As System.Configuration.AppSettingsReader = _ New System.Configuration.AppSettingsReader Me.cnFriends = New System.Data.SqlClient.SqlConnection ' 'cnFriends ' Me.cnFriends.ConnectionString = CType(configurationAppSettings.GetValue( _ "cnFriends.ConnectionString", GetType(System.String)), String) End Sub The new configurationAppSettings variable is an instance of the AppSettingsReader class, which allows access to the values in the Web.config file. The property s value is retrieved with this object, using the key that was built by the dynamic property, and cast explicitly to a string. Whenever you change the setting in the configuration file, this page will automatically use the new value. There s actually another method of getting the values that you store in Web.config file. You can modify the code that you ve been using to create connection objects so far to use the following syntax: Dim con As New SqlConnection( _ ConfigurationSettings.AppSettings("cnFriends.ConnectionString"))

6 - select count(*) from t1 where skew = 77) -----------------------------------------------------------------0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=1 Card=1 Bytes=3) 1 0 SORT (AGGREGATE) 2 1 INDEX (RANGE SCAN) OF 'T1_I1' (NON-UNIQUE) (Cost=1 Card=86 Bytes=258) Strategy 2 for calculating selectivity/cardinality: We have already noted that 75 is not a special value, so what happens when we execute a query to select all rows for that value Oracle uses the density (not 1/num_distinct, note) We have the density recorded as 0013885925, so we expect a cardinality of 3,240 * 0013885925 = 4499, and again the plan shows Execution Plan (920.

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