The following provides notes on duplication of the port numbers specified in HiRDB system definitions (the System common definition and Unit control information definition sections of Table 22-2 List of port numbers specified in HiRDB).

• In a single unit, specify different port numbers in each operand.
• For a HiRDB parallel server configuration, if you start multiple units on a single server machine, specify different port numbers in each operand of the respective units.
• If you start multiple units on the same server machine, specify different port numbers in each operand of the respective HiRDBs.
• If the same server machine has a HiRDB client and a HiRDB server, specify port numbers different from the client environment definition PDCLTRCVPORT in each operand.
• Specify port numbers that fulfill the following conditions.
  
  • They are different from the port numbers used by other program products.
  • They are different from the port numbers registered in the /etc/services file (for an NIS or DNS environment, the locations they respectively define)
  • They are not included in the range of port numbers auto-allocated by the OS^#
    #: The range of port numbers auto-allocated by the OS differs from OS to OS.
    
• When no HiRDB port number is specified, 20000 is assumed for the HiRDB port number. For this reason, do not specify 20000 in an operand.