Physical Modeling › Columns › Defining Table Column Properties for Target Databases › Define Informix Table Column Properties

Define Informix Table Column Properties

In a model based on an Informix target server, you use the Informix tab in the Table Column Editor to manage the data type, null option, and other properties for the selected column.

Note: The options described here are the basic options available for most physical data types. There can be more options available depending on the physical data type you assign to the table column. We recommend that you refer to your Informix documentation for more information about using these properties.

To define Informix table column properties

1. Right-click a column in the Model Explorer and click Properties.

   The Informix Table Column Editor opens.

2. Select the table from the Table drop-down that contains the column that you want to define.
3. Select the column in the Navigation Grid that you want to define.

   Note: Click New on the toolbar to create a new column. Use the Enter filter text box to filter a very large list of columns to quickly locate the one that you want to define.

4. Click the Informix tab and work with the following options:

   Physical Data type

   Lets you select a data type from the drop-down list to apply to the selected column. If the selected data type requires a value for precision, scale, or both, enter the value inside the data type parentheses. For example, you can select the DECIMAL() data type and specify a precision of 2 and a scale of 10 inside the parentheses to assign the data type DECIMAL(2,10) to the selected column.

   Null Option

   Lets you specify a null option for the selected column.

   Average Width

   Lets you enter an estimated average width for the column if variable width is allowed based on the data type you assigned. If it is not allowed, an error is displayed in the Details section at the bottom of the editor. You can later use the Volumetrics dialog to calculate table and database size estimates based on these and other values.

   Percent Null

   Lets you enter the estimated percentage of nulls used for that column if the option is available. For example, you can estimate a variable width ADDRESS 2 column assigned a width of 50 characters, to be NULL about 30 percent of the time. Use whole numbers. You can later use the Volumetrics dialog to calculate table and database size estimates based on these and other values.

   In

   Lets you enter the name of the Informix blobspace in which you want to store the current column. If you leave the field blank, data in the current column is stored with the rest of the table.

   Note: This option is only available if you select either a text or byte data type.

5. Click Close.

   Informix table column properties are defined and the Informix Table Column Editor closes.