If the same operand is defined in different definitions, HiRDB determines the value to be used on the basis of the priority order of the definitions, as shown below:

1. Single server definition, front-end server definition, dictionary server definition, back-end server definition
2. Server common definition
3. Unit control information definition
4. System common definition

A standard value can be specified in a definition that has a low priority, and then that value can be changed by specifying a different value in a definition with a higher priority.

If an operand is omitted from all definitions, the default value for the lowest priority definition is assumed.