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select rownum-1 'CLASS2' lpad(rownum-1,10,'0') from all_objects where rownum <= 25 ; update type2 set description = lpad(rownum-1,10,'0') ; We now have 45 rows in the reference table, and 45 distinct descriptions but we now have 25 different ID values and two different type values From a human perspective, we can identify exactly the 20 rows that belong to the join type and understand what is going on, but the optimizer simply does the arithmetic Repeat the query (changing the name of the reference table) and the execution plan looks like this: Execution Plan (9206 autotrace) ---------------------------------------------------------0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=287 Card=25 Bytes=975) 1 0 HASH JOIN (Cost=287 Card=25 Bytes=975) 2 1 TABLE ACCESS (FULL) OF 'TYPE2' (Cost=2 Card=1 Bytes=20) 3 1 TABLE ACCESS (FULL) OF 'T1' (Cost=284 Card=1001 Bytes=19019) The cardinality is wrong but not quite as wrong as I was expecting it to be.

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as children, and these, in turn, can contain other nodes, and so on. The DOM allows you to navigate back and forth between child and parent elements, too, tinkering with them as you go. It is neither forward-only nor read-only. The DOM is built on several key building blocks. The fundamental one is the concept of the Document, which is to DOM what the Schema element is for XSD. This important object is implemented by the .NET Framework in the System.Xml.XmlDocument class. Try It Out: Query a DOM Document With the information about the DOM in mind, you re ready to build the code for performing XPath queries, as we outlined in the previous section. 1. Open the code-behind page for the UploadListReport.aspx web form and import the following namespaces at the top of the file: Imports Imports Imports Imports System.IO System.Xml System.Xml.XPath System.Text

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In principle, the join selectivity should have changed from 1/20 to 1/25 dictated by the unfortunate truth that the type we are not interested in has more distinct values for the ID than the type we are interested in Moreover, the filtering on the type2 table has changed from 1/20 to (1/2 * 1/45 = 1/90).

This chart uses data from a High-Low dataset but with a special Candlestick plot. Listing 13-44. JRXML Syntax <!ELEMENT candlestickChart (chart, highLowDataset, candlestickPlot)>

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2. Add the GetReader() helper method to the UploadListReport class. This method will serve the same purpose as the function by the same name in the UploadList.aspx page: Private Function GetReader() As XmlReader If Session("xml") Is Nothing Then Throw New InvalidOperationException( _ "No XML file has been uploaded yet.") End If ' Build the XmlTextReader from the in-memory string saved before Dim xmlinput As New StringReader(CType(Session("xml"), String)) Return New XmlTextReader(xmlinput) End Function 3. Locate the Page_Load() method and place the following code inside it: Private Sub Page_Load(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles MyBase.Load ' Configure header MyBase.HeaderIconImageUrl = "~/Images/print.gif" MyBase.HeaderMessage = "Upload Attendees - Report" Dim ns As String = "http://www.apress.com/schemas/friendsreunion" Try ' Retrieve the reader object and initialize the DOM document Dim reader As XmlReader = GetReader() Dim doc As New XmlDocument doc.Load(reader)

So we hope to see the following appearing in the formulae: Join Selectivity = 1 / greater(25, 20) = 1/25 Join Cardinality = 1/25 * (45/90 * (500,000 * 1001/500000)) = 20 It s not right but it s easy to see where the wrong numbers have come from, the optimizer should have used 1/25 for the selectivity but in fact it seems to have used 1/20 and we can check this very precisely by examining the 10053 trace: in this example the optimizer really has used the smaller num_distinct to calculate the join selectivity I don t yet know what the rules are that made it take that choice, but look at the exact value of the sel entry in the join cardinality lines that I ve extracted from the 10053 trace files from all three versions of Oracle.

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