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IT30761: DB2 MAY RETURN SQL0901N ("COMBINED KEY LENGTH TOO BIG FOR SYSTEMTEMP") WHEN EXECUTING QUERIES INVOLVING ZIGZAG JOINS

Fixes are available

Db2 Version 11.1 Mod 4 Fix Pack 6 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod 4 Fix Pack 6 for Linux, UNIX, and Windows

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APAR status

  • Closed as program error.

Error description

  • SQL0901N with the message "Combined key length too big for
system temp" may be returned when executing queries involving
zigzag joins.

An example stack trace is seen below:

sqlzSetAndLog901 + 0x294
sqldCreateIndex__FP8sqeAgentP17SQLD_CREATEINX_CB + 0x6D4C
sqldIndexCreate__FP8sqeAgentP17SQLD_CREATEINX_CB + 0x2D88
sqlriCreateTempTableIndex__FP8sqlrr_cbP10sqlri_iudoUsT3 + 0x3EC
sqlrifiswp2__FP8sqlrr_cb + 0x480
sqldEvalDataPred__FP13SQLD_DFM_WORKPUlP10SQLD_DPRED + 0x3DC
sqlsfetc__FP8sqeAgentP8SQLD_CCBiP10SQLD_DPREDPP10SQLD_VALUEP8SQL
Z_RIDPc@OL@24042 + 0x320
sqlsfetc__FP8sqeAgentP8SQLD_CCBiP10SQLD_DPREDPP10SQLD_VALUEP8SQL
Z_RIDPc + 0xA4
sqlriFetch__FP8sqlrr_cbP9sqlri_taol + 0x11C
sqlrita__FP8sqlrr_cb + 0x1D4
sqlriZigZagJoin__FP8sqlrr_cb + 0x23E4
sqlrihsjn__FP8sqlrr_cb + 0xAA0
sqlriunn__FP8sqlrr_cbP10sqlri_stob + 0x424
sqlriset__FP8sqlrr_cb + 0x1A8
sqlriSectInvoke__FP8sqlrr_cbP12sqlri_opparm + 0x90
sqlrr_execimmd__FP14db2UCinterfaceP16db2UCprepareInfo + 0x11C8
sqlrr_execimmd__FP14db2UCinterfaceP16db2UCprepareInfo + 0xF0
executeSection__10pvmPackageFP5sqlcaUib + 0x3BC4
executeSection__10pvmPackageFP5sqlcaUib + 0x12C
executeQuery__3PVMFUib + 0x100
run__3PVMFv + 0x124
pvm_entry + 0xD70
sqloInvokeFnArgs + 0x1A0
sqlriInvokeInvoker__FP10sqlri_ufobb + 0xCC
sqlriInvokeInvoker__FP10sqlri_ufobb + 0x1498
sqlricall__FP8sqlrr_cb + 0x1E0
sqlriSectInvoke__FP8sqlrr_cbP12sqlri_opparm + 0x90
sqlrr_process_execute_request__FP8sqlrr_cbib + 0xB5C
sqlrr_execute__FP14db2UCinterfaceP9UCstpInfo + 0x1C4
sqljsParseRdbAccessed__FP13sqljsDrdaAsCbP13sqljDDMObjectP14db2UC
interface + 0x978
@72@sqljsSqlam__FP14db2UCinterfaceP8sqeAgentb + 0x11E4
@72@sqljsSqlam__FP14db2UCinterfaceP8sqeAgentb + 0x11E4
@72@sqljsSqlam__FP14db2UCinterfaceP8sqeAgentb + 0xDD8
@72@sqljsDriveRequests__FP8sqeAgentP14db2UCconHandle + 0xA8
@72@sqljsDrdaAsInnerDriver__FP18SQLCC_INITSTRUCT_Tb + 0x5FC
RunEDU__8sqeAgentFv + 0x40E1C
RunEDU__8sqeAgentFv + 0x124
EDUDriver__9sqzEDUObjFv + 0x130
sqloEDUEntry + 0x3A0
_pthread_body + 0xE8

Local fix

  • Disable the use of zigzag join via setting the following
registry setting (it can be applied immediately) either through
db2set or via a guideline:
DB2_REDUCED_OPTIMIZATION="ZZJN OFF"

Problem summary

  • ****************************************************************
* USERS AFFECTED:                                              *
* 250                                                          *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
* See Error Description                                        *
****************************************************************
* RECOMMENDATION:                                              *
* Upgrade to 11.1.4.6                                          *
****************************************************************

Problem conclusion

  • Upgrade to 11.1.4.6

Temporary fix

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IT30761
    • 

  • Reported component name
    DB2 FOR LUW
    • 

  • Reported component ID
    DB2FORLUW
    • 

  • Reported release
    B10
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt / Xsystem
    • 

  • Submitted date
    2019-10-30
    • 

  • Closed date
    2021-03-22
    • 

  • Last modified date
    2021-03-22
    • 





    

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

    
IT30759
    

    • 

  • 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


    

  • RB10  PSY
       UP
    • 








      
              
                            

              

              [{"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"SSEPGG","label":"DB2 for Linux- UNIX and Windows"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"11.1","Line of Business":{"code":"LOB10","label":"Data and AI"}}]
              

                          

          
 
        

      

    

      

        

          

            
Document Information


            

            


                        

            Modified date:
            

            04 May 2022
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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