DRDA_COMMBUFFSIZE configuration parameter

Use the DRDA_COMMBUFFSIZE configuration parameter to specify the size of the DRDA communications buffer.

When a DRDA session is established, the session is allocated a communication buffer equal to the current buffer size. If the buffer size is subsequently changed, existing connections are not affected, but new DRDA connections use the new size. HCL Informix® silently resets values greater than 2 Megabyte to 2 Megabytes and resets values less than 4 Kilobytes to the 32 Kilobyte default value.

onconfig.std value
Not in the onconfig.std file.
if not present
32K
values
Minimum = 4 Kilobytes
Maximum = 2 Megabytes
takes effect
When shared memory is initialized

Usage

Users might specify the DRDA_COMMBUFFSIZE value in either MB or KB by adding either ‘M' or ‘K' to the value. The letter is not case sensitive, and the default is kilobytes. For example, a one megabyte buffer can be specified in any of these ways:
  • DRDA_COMMBUFFSIZE 1M
  • DRDA_COMMBUFFSIZE 1m
  • DRDA_COMMBUFFSIZE 1024K
  • DRDA_COMMBUFFSIZE 1024k
  • DRDA_COMMBUFFSIZE 1024

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