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The actual storage requirements for index data pages will vary depending on the size of the data types on which the index is based. The more fields (and the larger the fields) are indexed, the greater the need for data pages, and thus the greater the requirement for more storage. To give you an example of the storage requirements of each storage engine in relation to a simple index, we populated two tables (one MyISAM and one InnoDB) with 90,000 records each. Each table had two CHAR(25) fields and two INT fields. The MyISAM table had just a PRIMARY KEY index on one of the CHAR(25) fields. Running the SHOW TABLE STATUS command revealed that the space needed for the data pages was 53,100,000 bytes and the space needed by the index data pages was 3,716,096 bytes. The InnoDB table also had a PRIMARY KEY index on one of the CHAR(25) fields, and another simple index on the other CHAR(25) field. The space used by the data pages was 7,913,472 bytes, while the index data pages consumed 10,010,624 bytes.

Figure 21-13. Tiling controls in a table This example shows the basic model of the TableLayoutPanel, but it doesn t explain how you can control the sizing behavior of the rows, columns, and individual controls. To master these details, you need to understand how the TableLayoutPanel works with styles, as described in the next section.

Note Throughout the course of this book, we will come back to this theme of well-documented policy

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To get the result you want with the TableLayoutPanel, you need to independently define the behavior of each row and column. You do this through a style-based model. Essentially, every column is paired with a matching ColumnStyle object. Every row is matched with a RowStyle object. You configure these style objects through the ColumnStyles and RowStyles properties of the TableLayoutPanel. In an attempt to simplify this model, Visual Studio doesn t expose these two collections directly in the Properties window. Instead, it lets you configure them through two linked virtual properties, named Columns and Rows or through the direct Edit Rows and Columns link in the Action pane. For example, imagine you create a 2 x 3 table by setting the ColumnCount and RowCount properties. Visual Studio will add the code required to create two RowStyle and three

You have already installed ODT.NET earlier in 2. If, for some reason, you did not install ODT.NET earlier, you can still do it later via the Oracle Universal Installer. You can launch the Oracle Universal Installer from the Windows Start menu by selecting Start All Programs ORACLE_HOME Oracle Installation Products Universal Installer. When the Oracle Universal Installer launches, click the Next button to follow through the various installation screens in the wizard (as you ve done in 2). The default installation of ODP.NET will automatically install the ODT.NET package.

ColumnStyle objects. RowStyle and ColumStyle objects are exceedingly simple in fact, they only have two properties each. The RowStyle class provides a Height property that sets the preferred height, while the ColumnStyle class provides a Width property. Both include a SizeType property, which determines how the Height or Width should be interpreted, and how the row should be resized when the TableLayoutPanel changes size. There are three possible values for SizeType, as shown in Table 21-3.

and procedures. We feel that a cornerstone of professional development practices is written documentation of all levels of the development cycle. By having procedures, policies, and expectations contained in a document repository, a project team gains the ability to most effectively track and manage changes to a project s scope and design.

With ODT.NET, you can browse and manage your Oracle database schemas from within the Visual Studio IDE. This ability can increase your productivity since you can create, edit, and delete tables or columns without leaving the Visual Studio IDE. An Oracle schema can be managed within the Server Explorer window of the Visual Studio IDE. The first thing you need to do is add a new connection to the Oracle database. Open the Server Explorer window by clicking the View Server Explorer menu item. Right-click the Data Connections node, and choose the Add Connection menu item shown in Figure 14-1.

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