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If FlowBreak is set to true and the FlowLayoutPanel.WrapContents property is also true, the next control is wrapped to the following line, even if there is sufficient space remaining. In that way, FlowBreak is a handy tool for separating groups of controls without relying on the FlowLayoutPanel borders alone. FlowBreak is false by default, and it has no effect if WrapContents is false. Figure 21-11 shows an example.

Now consider that if two records had been returned, we would have had the same number of operations to perform in either scenario! Furthermore, if more than two records had met the criteria, it would have been more operationally efficient not to use our new index and simply scan through all the records. This situation represents a classic problem in indexing. If the data set contains too many of the same value, the index becomes less useful, and can actually hurt performance. As we explained earlier, sequentially scanning through contiguous data pages on disk is faster than performing many seek operations to retrieve the same data from numerous points in the hard disk. The same concept applies to indexes of this nature. Because of the extra CPU effort needed to perform the lookup from the index record to the data record, it can sometimes be faster for MySQL to simply load all the records into memory and scan through them, comparing appropriate fields to any criteria passed in a query. If there are many matches in an index for a given criterion, MySQL puts in extra effort to perform these record lookups for each match. Fortunately, MySQL keeps statistics about the uniqueness of values within an index, so that it may estimate (before actually performing a search) how many index records will match a given criterion. If it determines the estimated number of rows is higher than a certain percentage of the total number of records in the table, it chooses to instead scan through the records. We ll explore this topic again in great detail in 6, which covers benchmarking and profiling.

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As you ve seen in the previous examples, the FlowLayoutPanel leaves some spacing between its child controls, and between the child controls and its borders. It does this by respecting the Margin and Padding properties. You first learned about Margin and Padding in 3, but these properties have an increased significance with the FlowLayoutPanel and TableLayoutPanel. In the examples you ve seen so far (a FlowLayoutPanel that contains numerous buttons), here s how these properties come into effect: The FlowLayoutPanel.Padding adds space between the panel edges and the buttons inside. You can adjust the Top, Bottom, Left, and Right properties of the padding separately. The Button.Margin property adds space between one button and adjacent buttons (or the edges of the panel). As with padding, the Margin property has Top, Bottom, Left, and Right properties. The Padding and Margin settings are cumulative. For example, if button1 is on the left and button2 is adjacent on the right, the space between them is the sum of button1.Margin.Right and button2.Margin.Left. Similarly, if button1 is the first control in flowPanel, the space between the left edge is the sum of button1.Margin.Left and flowPanel.Padding.Left. Figure 21-12 illustrates how this works. By default, controls like the button have a margin of 3, and the FlowLayoutPanel has no padding.

You can calculate the performance boost simply by dividing the elapsed time without connection pooling by the elapsed time with connection pooling. The preceding results indicate that by turning on connection pooling, the performance is twice as fast for ten iterations with connection pooling turned on than without. Analyzing the results in more detail, you also find that the performance boost is, in fact, not linear, and the more connections that are opened and closed, the better the performance gain. This proves that

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