IBM Support

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

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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 number

    IT43294

  • Reported component name

    INFORMIX SERVER

  • Reported component ID

    5725A3900

  • Reported release

    C10

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2023-03-07

  • Closed date

    2023-05-18

  • Last modified date

    2023-05-18

  • 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

[{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSGU8G","label":"Informix Servers"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"C10","Line of Business":{"code":"LOB10","label":"Data and AI"}}]

Document Information

Modified date:
18 May 2023