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LI72656: TAUTOLOGY PREDICATE PUSH DOWN THROUGH A SELF-JOIN COMMON EXPRESSION MAY CRASH THE DATABASE

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • If a predicate that will be proved to be a tautology in DB2
    Query Rewrite pushes down through a common expression and the
    common expression are self-joined, this may crash the
    database.  A trap file might have a similar below stack
    traceback:
    
    <StackTrace>
    --EBP------EIP------ARGS-----------------------------
    pushed_in_qun
    sqlnr_cse_ppd_chk
    sqlnr_local_magic_detail
    sqlnr_localmagic_action
    sqlnr_comp
    sqlnr_rcc
    sqlnr_magic_detail_action
    sqlnr_comp
    sqlnr_rcc
       :
    
    The problem needs to go to various query rewrites so it is
    impossible to write the whole story and all examples.
    

Local fix

  • N/A
    

Problem summary

  • see problem description
    

Problem conclusion

  • First fixed in DB2 UDB Version 9.5, FixPak 1
    

Temporary fix

Comments

APAR Information

  • APAR number

    LI72656

  • Reported component name

    DB2 UDE ESE LIN

  • Reported component ID

    5765F4104

  • Reported release

    950

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2007-11-06

  • Closed date

    2008-05-15

  • Last modified date

    2008-05-15

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

    LI72449

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

Fix information

  • Fixed component name

    DB2 UDE ESE LIN

  • Fixed component ID

    5765F4104

Applicable component levels

  • R910 PSY

       UP

  • R950 PSY

       UP

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Document Information

Modified date:
15 May 2008