To use a system parameter:
In the Object Navigator, expand the Data Model node, then expand the System Parameters node.
Double-click
(the properties icon) for the desired parameter to display the Property
Inspector.
Under the Parameter node, set the Initial Value property, if required.
To validate the parameter's value at runtime, set the Validation Trigger property by clicking the property field to display the PL/SQL Editor and define the PL/SQL to be triggered at runtime.
Next step
Selecting parameters to include in the Parameter Form
Displaying the Parameter Form at runtime
About referencing columns and parameters
Validating a parameter value at runtime
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