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we get an execution plan from autotrace as follows: Execution Plan (9.2.0.6) ---------------------------------------------------------0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=8 Card=20 Bytes=340) 1 0 TABLE ACCESS (BY INDEX ROWID) OF 'T1' (Cost=8 Card=20 Bytes=340) 2 1 BITMAP CONVERSION (TO ROWIDS) 3 2 BITMAP AND 4 3 BITMAP INDEX (SINGLE VALUE) OF 'T1_I4' 5 3 BITMAP INDEX (SINGLE VALUE) OF 'T1_I2' In this case, the final cost is 8, a little lower because of the size of the indexes. We still expect to acquire 20 rows from the table, so our estimate for the table-related cost is still 6, but the indexes are so small that the cost of visiting each index is just one block per index, for a total of 2, which is then scaled up to 2.2; and indeed we see the following in the last lines of the 10053 trace:

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******** Bitmap access path accepted ******** Cost: 8 Cost_io: 8 Cost_cpu: 0.000000 Selectivity: 0.002000 Not believed to be index-only. BEST_CST: 8.47 PATH: 20 Degree: 1 Note, by the way, that in this fragment of the trace file, 8.47 = 2.2 + 6.27, and in the previous fragment we have 12.87 = 6.6 + 6.27. The optimizer really is multiplying the index component by 1.1, and is giving a nonintegral value to visiting table blocks. Again, though, the 80/20 approximation used here starts to break down if pressed too hard, with diverging results as data sizes increase and the number of indexes used goes up.

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As previously mentioned, chart datasets resemble variables in that they are used to calculate a certain value in an incremental fashion. In the case of the chart dataset, this value is a complex data structure that will be used by the charting library to render the chart. This data structure is built incrementally during iteration through the report data source by adding values to it.

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Try It Out: Add Paging The DataGrid control has intrinsic support for paging, and all that s required to take advantage of it is to set a couple of properties and handle a single event that s fired when the user changes the current page. You ll add this functionality to the grdApproved grid, limiting the visible rows to only one, so that you can see paging in action. 1. Change the grdApproved properties to set AllowPaging to True and the PageSize to 1. 2. Locate the PagerStyle property, and set the following subproperties: Mode: NextPrev NextPageText: Next > PrevPageText: < Previous HorizontalAlign: Left 3. To reconfigure the page when the user moves back and forth through the records, you need to wire up and handle the PageIndexChanged event that s fired by the DataGrid. To do this, go to the code-behind page, select the grdApproved item from the leftmost drop-down list at the top of the code editor, and then select the PageIndexChanged event from the rightmost drop-down list. Now you can modify the handler that is created: Private Sub grdApproved_PageIndexChanged(ByVal source As Object, _ ByVal e As System.Web.UI.WebControls.DataGridPageChangedEventArgs) _ Handles grdApproved.PageIndexChanged ' Set the new index grdApproved.CurrentPageIndex = e.NewPageIndex ' Fill approved contacts adApproved.SelectCommand.Parameters("@ID").Value = _ Page.User.Identity.Name adApproved.Fill(dsApproved) grdApproved.DataBind() End Sub 4. Save and run the page, and voil , you have paging, as shown in Figure 5-10.

If you have several bitmap indexes on a table, then Oracle is capable of using as many of them as is necessary to make the query run efficiently, but won t necessarily use all the ones that appear to be relevant. This leads to an important question: when does Oracle decide that there is no point in using one more bitmap index The answer is (approximately, and ignoring the effect of bugs) when the cost of scanning one more set of leaf blocks is larger than the reduction in the number of table blocks that will be hit. For example, assume you have a table that lists six attributes for people: sex (2 values), color of eyes (3 values), color of hair (7 values), home town (31 values), age band (47 values), and work classification (79 values). Now consider the test case in script bitmap_cost_03.sql in the online code suite, which builds a table of 800MB (107,543 blocks) holding details of 36 million people, with a query for rows where and and and and and sex_code = 1 eye_code = 1 hair_code = 1 town_code = 15 age_code = 25 work_code = 40

How It Works You start the process by setting two properties that enable the paging mechanism in the grid: AllowPaging and PageSize. The pager mode and style are set next, where you specify the text the links will have, as well as their placement in the footer. Once the pager links are in place, they raise the PageIndexChanged event when the user clicks them, which you handle in the code-behind page:

If you had built individual bitmap indexes on all six columns, what is the probability that Oracle would use all six of them for this query Answer almost certainly zero. In fact, in my test case, Oracle used the three higher precision indexes, and ignored the three low precision indexes.

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