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In this example, I have created a loopback database link to help me emulate a distributed query, and then joined a table to itself The column skew that appears with the predicate skew = 5 has a very skewed data distribution, and has had a histogram built on it When I generate an execution plan for the query: select count(*) from t1 where skew = 5; Oracle estimates a cardinality of 22 if I have the histogram, and 41 if I don t In fact, whatever I do with local queries, or remote (ie, single-site) queries, Oracle always manages to come up with a cardinality of 22 if I have a histogram in place As soon as I write a distributed query, though, Oracle loses track of the histogram for whichever copy of the table is not at the driving site.

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In my test case, regardless of which site was driving the query, the execution plan was as follows: Execution Plan (9206) ---------------------------------------------------------0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=33 Card=28 Bytes=9296) 1 0 HASH JOIN (Cost=33 Card=28 Bytes=9296) 2 1 TABLE ACCESS (FULL) OF 'T1' (Cost=16 Card=22 Bytes=4488) 3 1 REMOTE* (Cost=16 Card=41 Bytes=5248) D920JLCOMPCOUK@LOOPBACK We are querying t1 in two different disguises, but with the same predicate.

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' Initialize the adapters Dim adExisting As New SqlDataAdapter(sql, con) Dim adPlaces As New SqlDataAdapter( _ "SELECT * FROM Place ORDER BY TypeID", con) Dim adPlaceTypes As New SqlDataAdapter( _ "SELECT * FROM PlaceType", con) con.Open() ds = New DataSet Try ' Proceed to fill the dataset adExisting.Fill(ds, "Existing") adPlaces.Fill(ds, "Places") adPlaceTypes.Fill(ds, "Types") Finally con.Close() End Try End Sub 9. The InitPlaces() method uses the DataSet you just filled to add items to the panel at the top of the page: a summary of each existing place and a link to allow the user to delete it. You saw how to create dynamic content in 3, but now you use data from the DataSet to drive the process. Add this method below to the previous one: Private Sub InitPlaces() phPlaces.Controls.Clear() Dim msg As String = _ "Type: {0}, Place: {1}. From {2}/{3} to {4}/{5}. Description: {6}." Dim row As DataRow For Each row In ds.Tables("Existing").Rows Dim lbl As New LiteralControl

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Note how the cardinality for the local query is different from the cardinality for the remote version, which (depending on driving site) gets reported in the other column of the plan_table as one of the following: SELECT "SKEW","SKEW2","PADDING" FROM "T1" "AWAY" WHERE "SKEW"=5 SELECT "SKEW","SKEW2","PADDING" FROM "T1" "A2" WHERE "SKEW"=5 Of course, if you check the v$sql_plan view at the remote site after running the query, you find that the remote site actually has used the histogram to work out the cardinality of the incoming query But it s too late by then; the overall plan has already been fixed, and the site that created it may have selected the wrong join order or join method because it didn t have the right information about the remote table s cardinality..

' Format the msg variable with values in the row lbl.Text = String.Format(msg, _ row("Type"), row("Place"), _ row("MonthIn"), row("YearIn"), _ row("MonthOut"), row("YearOut"), row("Name")) Dim btn As New LinkButton btn.Text = "Delete" ' Pass the LapseID when the link is clicked btn.CommandArgument = row("LapseID").ToString() ' Attach the handler to the event AddHandler btn.Command, AddressOf OnDeletePlace ' Add the controls to the placeholder phPlaces.Controls.Add(lbl) phPlaces.Controls.Add(btn) phPlaces.Controls.Add(New LiteralControl("<br>")) Next ' Hide the panel if there are no rows If ds.Tables("Existing").Rows.Count > 0 Then pnlExisting.Visible = True Else pnlExisting.Visible = False End If End Sub 10. In the previous method, you attached the same handler to all of the link buttons, but because each of them has a different CommandArgument, you can use that value to determine which row to delete. The code to perform the deletion is very similar to what you have seen so far. Add this method, which will handle the user action: Private Sub OnDeletePlace(ByVal sender As Object, _ ByVal e As CommandEventArgs) ' e.CommandArgument receives the LapseID to delete Dim con As New SqlConnection( _ "data source=.;initial catalog=FriendsData;" + _ "user id=apress;pwd=apress") Dim cmd As New SqlCommand( _ "DELETE FROM TimeLapse WHERE LapseID='" + _ e.CommandArgument.ToString() + "'", con) con.Open() Try cmd.ExecuteNonQuery()

I mentioned earlier on that there are two different types of histogram, referred to by Oracle as the frequency histogram and the height balanced histogram. We will examine the frequency histogram first, as it is much simpler to deal with. The script c_skew_freq.sql in the online

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