IBM Support

IC91445: LOAD WITH MDC/RP TABLE and ROW COMPRESSION ENABLED MIGHT HANG BECAUSE OF EXHAUSTED BUFFERS

Subscribe

You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • Note that this issue affects DB2 LUW Version 9.7 Fix Pack 8
    only.
    
    When very little data buffer is specified, such as 8, for a load
    with a MDC/RP table, and row compression is enabled for the
    table, the load might hang because of exhausted buffers.
    
    You can see the following stacks (especially the load formatter
    stack that is a bit different from the other load hang issues we
    have found before):
    
    Load Media Reader (db2lmr):
      select
      sqlorqueInternal
      sqlorque2
      sqluReadBufferFromQueue
      sqluMCContinueRestore
      sqluMCProcessRestoreStates
      sqluMCStartRestoreMediaController
      sqluCMediaReader::iRun
    
    Load Formatter (db2lfrm0):
      msgrcv
      sqlorqueInternal
      sqlorque2
      squGetMsgFromEQ2
      sqlulGetBuff
      sqlulNextPage
      sqluCreateAndInitPage
      sqldNextDictPageForLoad
      sqldInsertDictionary
      sqluInsertDictionary
      sqluBuildDictionary
      sqluAssignRIDsToDMRecList
      sqluRiddifierProcOneSubList
      sqluRiddifierProcessRecList
      sqluRiddifyRecords
      sqluGetNewRecordStruct
      sqluFormatDMRec
      sqluGetAndFormatRecords
      sqluCFormatter::iRun
    
    Load Buffer Manipulator (db2lbm0):
      sleep
      nsleep
      nanosleep
      ossSleep
      sqlorest
      sqlulBMGetNextBuffer
      sqluGetMoreDataForBM
      sqlulBMCont
      sqluCBufferManipulator::iRun
    
    Load Agent (db2agent):
      select
      sqlorqueInternal
      sqlorque2
      sqlulReadQ
      sqlulPollMsg
      sqluvload
      call_sqluvload
      sqluLoadPartition
      sqlu_register_table_load
      sqluvtld_route_in
    

Local fix

  • Increase the number of data buffers
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * All DB2 For LUW users                                        *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description.                                       *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Upgrade to DB2 LUW Version 9.7 Fix Pack 9 or higher levels.  *
    ****************************************************************
    

Problem conclusion

  • First fixed in DB2 LUW Version 9.7 Fix Pack 9.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IC91445

  • Reported component name

    DB2 FOR LUW

  • Reported component ID

    DB2FORLUW

  • Reported release

    970

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-04-10

  • Closed date

    2013-12-17

  • Last modified date

    2013-12-17

  • 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

    DB2 FOR LUW

  • Fixed component ID

    DB2FORLUW

Applicable component levels

  • R970 PSN

       UP



Document information

More support for: DB2 for Linux, UNIX and Windows

Software version: 9.7

Reference #: IC91445

Modified date: 17 December 2013