The table below lists the types of HiRDB system definition. The figure following that shows an example of a configuration of HiRDB system definition files.

Table 6-5 HiRDB system definitions (HiRDB single server configuration)

HiRDB system definition type	Storage file name	Description
System common definition	%PDDIR%\conf\pdsys	Defines the configuration of HiRDB and common information. This file is required for each HiRDB single server configuration.
Unit control information definition	%PDDIR%\conf\pdutsys	Defines unit control information. This file is required for each unit.
Server common definition	%PDDIR%\conf\pdsvrc	Defines default values for single server definition operands. This file is optional.
Single server definition	%PDDIR%\conf\server-name	Defines the execution environment for a single server. This file is required for each single server. In the UNIX edition: This file does not need to be defined for a utility special unit.
UAP environment definition	%PDDIR%\conf\pduapenv\any-name	Defines the UAP execution environment. This file is optional. You can create a maximum of 4,096 UAP environment definitions.
SQL reserved word definition	%PDDIR%\conf\pdrsvwd\any-name	Defines SQL reserved words. This file is required to use the SQL reserved word deletion facility. For details about the SQL reserved word deletion facility, see the HiRDB Version 9 UAP Development Guide.

Figure 6-7 Example configuration of HiRDB system definition files (HiRDB single server configuration)

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The utility special unit is a feature that is limited to the UNIX edition.