The HiRDB reserved port facility uses the pd_registered_port operand to specify a range of port numbers that can be used for communication. This facility prevents the following:

• A program other than HiRDB communicates with a server using several port numbers allocated automatically by the OS, but processing is interrupted because there are no available port numbers
• HiRDB uses a large number of communication port numbers, which affects the communication processing of other programs
  Allocated ports that are released by HiRDB cannot be used for a period of time. Therefore, if a large number of ports are in use, it is possible that for a brief period there will be no available port numbers.
  

Consider using the HiRDB reserved port facility in the following cases:

• When CONNECT or DISCONNECT from HiRDB clients occur several thousand times a minute
• When transactions occur several thousand times a minute on a HiRDB/Parallel Server

For details about definition examples and notes about using the HiRDB reserved port facility, see the explanation for the pd_registered_port operand in the manual HiRDB Version 8 System Definition.

Organization of this section

23.5.1 Estimation of the HiRDB reserved port facility