With HiRDB communication processing, if the pd_registered_port operand is not specified, the communication port numbers allocated automatically by the operating system are used. Increase the number of communication ports to be used in accordance with the value of the pd_max_users operand and increases in the number of back-end servers. If there are insufficient port numbers, processing can be interrupted or the communication processing of other programs can be influenced.
You can use the pd_registered_port operand to specify a range of port numbers for HiRDB to use for communication processing (reserved port facility). For details about the HiRDB reserved port facility, see 23.6 HiRDB reserved port facility.