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The scenario we ve just outlined is a simplified, but conceptually accurate, depiction of how an actual index works. The reduced set of data, with only weights and record identifiers, would be an example of an index. The index provides the database server with a streamlined way of comparing values to a given search criteria. It streamlines operations by being sorted, so that the server doesn t need to load all the data into memory just to compare a small piece of the record s data. The style of index we created is known as the index sequential access method, or ISAM. The MyISAM storage engine uses a more complex, but theoretically identical, strategy for structuring its record and index data. Records in the MyISAM storage engine are formatted as sequential records in a single data file with record identifier values representing the slot or offset within the file where the record can be located. Indexes are built on one or more fields of the row data, along with the record identifier value of the corresponding records. When the index is used to find records matching criteria, a lookup is performed to retrieve the record based on the record identifier value in the index record. We ll take a more detailed look at the MyISAM record and index format in 5.

Figure 21-10. Spacing different-sized controls The order of controls in the FlowLayoutPanel is determined by the z-order (first described in 2). The controls are laid out in order from lowest to highest z-index. Ordinarily, the z-index is incremented for each new control you create at design time, which means the controls you add first appear first in the FlowLayoutPanel (assuming FlowDirection is LeftToRight or TopDown). To change the order, you can drag and drop child controls inside the FlowLayoutPanel. Their z-indexes will be adjusted automatically.

In the next chapter, you will explore how to use the tools in the Oracle Developer Tools.NET package to improve your productivity.

Tip You also can change the order programmatically by calling the ControlCollection.SetChildIndex()

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Now that we ve explored how an index affects data retrieval, let s examine the benefits and some drawbacks to having the index perform our search operations. Have we actually accomplished our objectives of reducing the number of operations and cutting down on the amount of memory required

_stopwatch.Elapsed.TotalSeconds.ToString() + " seconds\n"; //Open and close connections 10 times with connection pooling enabled _connstring = "Data Source=localhost/NEWDB;User Id=EDZEHOO;Password=PASS123;Pooling=true"; _connObj = new OracleConnection(_connstring); _stopwatch.Reset(); _stopwatch.Start(); for (int i = 1; i <= 10; i++) { _connObj.Open(); _connObj.Close(); } _stopwatch.Stop(); _Results = _Results + "With connection pooling:\t" + _stopwatch.Elapsed.TotalSeconds.ToString() + " seconds\n"; MessageBox.Show(_Results); _connObj.Close(); } catch (Exception ex) { MessageBox.Show(ex.ToString()); } } If you run this form and click the button, you will see a pop-up message showing you the elapsed time with connection pooling turned on and turned off. Note down these numbers, and run the same code again, but change the number of iterations from 10 to 50. If you repeat these steps with 100, 500, and 1,000 iterations, you will be able to tabulate results similar to the following: Iterations Without connection pooling 0.4485831 1.5553226 3.0455792 13.8253361 25.8209253 With connection pooling 0.2239234 0.0757786 0.0816510 0.1356212 0.2001342 Performance boost x 2.00 x 20.52 x 37.30 x 101.94 x 129.02

method, as in flowLayoutPanel1.SetChildIndex(myControl, newIndex).

In the first scenario (Figure 2-3), all five records were loaded into memory, and so five operations were required to compare the values in the records to the supplied constant 2. In the second scenario (Figure 2-4), we would have skipped to the weight record at the third position, which is halfway between 5 (the number of elements in our set) and 1 (the first element). Seeing this value to be 20.00, we compare it to 2. The 2 value is lower, so we eliminate the top portion of our weight records, and jump to the middle of the remaining (lower) portion of the set and compare values. The 3.50 value is still greater than 2, so we repeat the jump and end up with only one remaining element. This weight just happens to match the supplied criteria, so we look up the record data associated with the record identifier and add it to the returned array of data records. Since there are no more data values to compare, we exit. Just looking at the number of comparison operations, we can see that our streamlined set of weights and record identifiers took fewer operations: three compared to five. However, we still needed to do that extra lookup for the one record with a matching weight, so let s not jump to conclusions too early. If we assume that the lookup operation took about the same amount of processing power as the search comparison did, that leaves us with a score of 5 to 4, with our second method winning only marginally.

The FlowLayoutPanel implements IExtenderProvider, which allows it to extend other controls on the form. It adds a single property to all its child controls: a Boolean property named FlowBreak.

10 50 100 500 1,000

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