Relationships and Domains › Domains and Data Modeling › Domains in the Physical Model › Specifying Database-Specific Options For a Domain › Define DB2 for i Domain Properties

Define DB2 for i Domain Properties

In a model based on a DB2 for i target server, you use the DB2 for i tab in the Domain Editor to manage the data type, null option, and other properties for the selected domain.

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 domain. We recommend that you refer to your DB2 for i documentation for more information about using these properties.

To specify DB2 for i domain properties

1. Click Domains on the Model menu.

   The Domain Editor opens.

2. Select the domain in the Navigation Grid that you want to define.

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

3. Click the DB2 for i 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 domain. 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 domain.

   Null Option

   Lets you specify a null option.

   Maximum Length In Row

   Lets you specify

   Average Width

   Lets you enter an estimated average width for columns 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 columns if the option is available. Use whole numbers. You can later use the Volumetrics dialog to calculate table and database size estimates based on these and other values.

   Label

   Lets you enter the name of a label that appears opposite the column value in DB2 for i applications.

   Header

   Lets you enter the heading name for column values when they appear as a table.

   DB Name

   Lets you enter the name that designates the DB2 for i database.

   Column Compression

   Specifies whether to use column compression. Select the check box to enable this option.

   Generated

   Lets you specify how DB2 for i generates values for columns. Select a value from the drop-down list.

   Character Type

   Lets you specify the data subtype for character columns. Select a value from the drop-down list.

   Note: This option is only available if you select either the CHAR, CHAR(), CHARACTER, CHARACTER(), VARCHAR(), or LONG VARCHAR() data type.

   Coded Character Set Identifier

   Lets you specify the CCSID for the columns.

   System Name

   Lets you enter a name to override the alias name that DB2 for i automatically assigns to each column. Leave this field empty if you want the DB2 for i database to automatically truncate column names to show only the first 10 characters.

   Allocate

   Lets you enter a value in characters that defines the space you want to allocate for columns in each row.

4. Click Close.

   Domain properties are defined and the Domain Editor closes.