IT43294: INCREASE IN GLOBAL MEMORY POOL USAGE WHEN RECEIVING MANY FRAGMENTED NETWORK DATA PACKETS

APAR status

• Closed as program error.

Error description

• The communication protocol used by the Informix client and
  server may involve a sequence of transferring many packets of
  data from the client to the server. An example would be the
  insert or update of large blob or character columns. Data is
  sent by the client in packets of, for example, 1k or 4k bytes
  but the size of each packet read by the Informix server may not
  match. The amount of data received in each read call may vary
  depending on the host server load or network characteristics and
  may vary from a few bytes to multiple kb. The data returned by
  each read call is stored in its own fixed size buffer with the
  result that many such buffers  may be required.
  
  The memory for the network data buffers is allocated from the
  global memory pool. This pool is not automatically drained and
  may become fragmented over time leading to more shared memory
  being required in order to accommodate requests for the
  relatively large network buffers.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * Users of Informix Server prior to 12.10.xC16 and 14.10.xC11. *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * See Error Description                                        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * Upgrade to Informix Server 12.10.xC16 or 14.10.xC11 (when    *
  * available).                                                  *
  ****************************************************************
  

Problem conclusion

• Fixed in Informix Server 12.10.xC16 and 14.10.xC11.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  INFORMIX SERVER

• Fixed component ID

  5725A3900

Applicable component levels