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IT25300: COLUMN BASED QUERY MAY HANG IF THE QUERY CONTAINS AGGREGATION FUNCTIONS AND DATA EXCEPTION OCCURS

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APAR status

  • Closed as program error.

Error description

  • A column based query may hang if it meets the following
    conditions:
    
    1. Containing aggregation functions such as group by, SUM etc.
    
    2. Data exceptions may occur for aggregation functions e.g SUM
    in the query has exceeded a data type limit (for example hitting
    the maximum integer size)
    
    During the hang period in db2pd -latch output, there are
    manylatch waiters waiting on
    SQLO_LT_ibm_cde__query__GroupByControlBlock__mErrorAndWarningMut
    ex latch, but there is no latch holder.
    
    In db2diag.log, the similar messages may be observed.
    
    2014-01-23-23.01.03.231194+480 E9934361A458         LEVEL:
    Severe
    PID     : 13172852             TID : 388027         PROC :
    db2sysc 0
    INSTANCE: db2inst1             NODE : 000 HOSTNAME: host1
    EDUID   : 388027               EDUNAME: db2agent (idle) 0
    FUNCTION: DB2 UDB, oper system services,
    sqloDumpLatchTableToLog, probe:10
    DATA #1 : String, 102 bytes
    Latch leaked on EDU termination: File GroupByControlBlock.hpp :
    Line 2648 (Identity: 914) HoldCount: 1
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * ALL                                                          *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Upgrade to Db2 11.1 Mod 4 Fixpack 4 or higher                *
    ****************************************************************
    

Problem conclusion

  • First fixed in Db2 11.1 Mod 4 Fixpack 4
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT25300

  • 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

    2018-06-08

  • Closed date

    2018-11-27

  • Last modified date

    2018-11-27

  • 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

  • RB10 PSN

       UP

[{"Business Unit":{"code":"BU048","label":"IBM Software"},"Product":{"code":"SSEPGG","label":"DB2 for Linux, UNIX and Windows"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"11.1","Edition":"","Line of Business":{"code":"LOB10","label":"Data and AI"}}]

Document Information

Modified date:
27 November 2018