The specification values of the following operands cannot be changed:

• pd_system_id
• pd_master_file_name

If the values specified in these operands are changed, the database must be initialized. Consequently, the system reconfiguration command should not be used to change these HiRDB system definitions.

The following operands cannot be changed:

• pdlogadfg -d sys and pdlogadpf -d sys (only operands associated with system log files that are current or overwrite disabled cannot be deleted)
• pdlogadfg -d spd and pdlogadpf -d spd (only operands associated with synchronization point dump files that are being written or are overwrite disabled cannot be deleted)
• pd_syssts_file_name_1 to 7 (only operands associated with status files for the primary unit cannot be deleted)
• pd_sts_file_name_1 to 7 (only operands associated with status files for the primary server cannot be deleted)

Specification of operands related to reduced activation has no effect.

Changing the values specified in some operands requires changing values specified in operating system parameters as well. Examples of such operands are pd_max_users and SHMMAX. For a change to an operating system parameter to take effect, the machine must be restarted. In such a case, we recommend that you do not use the system reconfiguration command to modify HiRDB system definitions. Instead, terminate HiRDB normally, and then make the changes.

You must pay special attention if you use the pdrplstart or pdrplstop command to change the execution status of the HiRDB Datareplicator data extraction facility. Whether you will be able to execute the system reconfiguration command might depend on the value of the pd_rpl_init_start operand.

The following table shows the executability of the system reconfiguration command depending on the pd_rpl_init_start operand's value and the data extraction facility's status.

Table 9-1 Executability of the system reconfiguration command depending on the pd_rpl_init_start operand value and the data extraction facility status

Value of pd_rpl_init_start before change	Execution status of the HiRDB Datareplicator data extraction facility	Value of pd_rpl_init_start after change	Executability of the system reconfiguration command
Y	Running	Y	Yes
		N (default)	No
	Stopped (by means of the pdrplstop command)	Y	No
		N (default)	Yes
N (default)	Stopped	Y	No
		N (default)	Yes
	Running (by means of the pdrplstart command)	Y	Yes
		N (default)	No

Legend:

Yes: The pd_rpl_init_start operand can be changed.

No: The pd_rpl_init_start operand cannot be changed.

To set up or remove optional program products or plug-ins, you must stop HiRDB. This means that you might not be able to use the system reconfiguration command to delete operands or change specification values required by prerequisite products, such as optional program products and plug-ins.