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4 B-tree structures are designed to spread key values evenly across the tree structure, adjusting the nodes within a tree structure to remain in accordance with a predefined branching factor whenever a key is inserted Typically, a high branching factor is used (number of keys per node) in order to keep the height of the tree low Keeping the height of the tree minimal reduces the overall number of disk accesses Generally, B-tree search operations have an efficiency of O(logxn), where x equals the branching factor of the tree (See the Computational Complexity and the Big O Notation section earlier in this chapter for definitions of the O efficiencies) This means that finding a specific entry in a table of even millions of records can take very few disk seeks Additionally, because of the nature of B-tree indexes, they are particularly well suited for range queries.

To create a PL/SQL package, look for the Packages node in the Server Explorer, right-click it and choose the New Package menu item (as shown in Figure 14-14).

Note In this example, the layout logic is performed when the Form.Load event fires. For best performance,

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Because the nodes of the tree are ordered, with pointers to the index pages between a certain range of key values, queries containing any range operation (IN, BETWEEN, >, <, <=, =>, and LIKE) can use the index effectively The InnoDB and MyISAM storage engines make heavy use of B-tree indexes in order to speed queries There are a few differences between the two implementations, however One difference is where the index data pages are actually stored MyISAM stores index data pages in a separate file (marked with an MYI extension) InnoDB, by default, puts index data pages in the same files (called segments) as record data pages This makes sense, as InnoDB tables use a clustered index organization In a clustered index organization, the leaf node of the B-tree index is the data page, since data pages are sorted by the clustering key.

you should perform this task even earlier. That s because when the Form.Load event fires, the handles have already been created for the form and the TableLayoutPanel. A better place to perform initialization like this is in the Form constructor, immediately after InitializeComponent() is called to create the control objects.

Figure 14-14. Creating a new package You will now see the window shown in Figure 14-15 that lets you specify the details of the package. The concept behind these GUI windows are the same; they are meant to make it as convenient as possible for you to generate the stubs and skeleton code necessary to get going.

You can easily extend this example to use even more columns. For example, you could create a four-column table with two pairs of settings, or you could add a third column with a button, as shown in Figure 21-20. In this example, the label column sizes to the largest label, the button column sizes to the fixed button size, and the text box column in between takes the remaining space.

All secondary indexes are built as normal B-tree indexes with leaf nodes containing pointers to the clustered index data pages As of version 41, the MEMORY storage engine supports the option of having a tree-based layout for indexes instead of the default hash-based layout You ll find more details about each of these storage engines in 5..

You will notice from this window that there is a table that allows you to define the PL/SQL methods in this package. You can click the Add button to add a new method to the package. When you have done that, the window shown in Figure 14-16 will be displayed. You will be able to specify the list of arguments for the stored procedure or function.

Figure 21-20. A more-detailed list of settings To create this window, you simply need to add a third AutoSize column. You can then dock a newly created button in the column, as shown here: Button cmd = new Button(); cmd.Text = "Browse..."; cmd.Width = 60; tableLayoutPanel1.Controls.Add(cmd); One other frill is added the entire TableLayoutPanel is made scrollable by setting AutoScroll to true.

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