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IZ37337: INTERNAL ERROR SQL0901 FROM AN INCORRECT CORRELATION CAUSED BY A N OPTIMIZATION OF SCALAR SUBQUERY

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APAR status

  • Closed as program error.

Error description

  • An incorrect correlation may be formed when DB2 is trying to
    rewrite scalar subquery to a more efficient access form. Users
    may see the message
    SQL0901N  The SQL statement failed because of a non-severe
    system error.
    Subsequent SQL statements can be processed.  (Reason "Bad
    Plan; Unresolved QNC
    found".)  SQLSTATE=58004
    Note that this error message may be caused by other problems.
    It is not necessary that it is caused by this problem. If the
    SQL statement does not contain any scalar subquery, it does
    not hit this problem. If the scalar subquery does not refer to
    columns outside of the subquery boundary, it also does not hit
    this problem.
    

Local fix

  • Reduce the optimization level to 0 or 1 will avoid this problem.
    

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    ALL
    ****************************************************************
    PROBLEM DESCRIPTION:
    An incorrect correlation may be formed when DB2 is trying to
    rewrite scalar subquery that references a column outside the
    subquery boundary
    to a more efficient access form. Users may see the message
    
    SQL0901N  The SQL statement failed because of a non-severe
    system error.
    Subsequent SQL statements can be processed.  (Reason "Bad
    Plan; Unresolved QNC
    found".)  SQLSTATE=58004
    Note that this error message may be caused by other problems.
    It is not necessary that it is caused by this problem. If the
    SQL statement does not contain any scalar subquery, it does
    not hit this problem. If the scalar subquery does not refer to
    columns outside of the subquery boundary, it also does not hit
    this problem.
    ****************************************************************
    RECOMMENDATION:
    Upgrade to DB2 Version 9.1 Fix Pack 7
    ****************************************************************
    

Problem conclusion

  • Fixed in DB2 Version 9.1 Fix Pack 7
    

Temporary fix

Comments

APAR Information

  • APAR number

    IZ37337

  • Reported component name

    DB2 POFE

  • Reported component ID

    5724N7700

  • Reported release

    910

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2008-11-13

  • Closed date

    2009-01-06

  • Last modified date

    2009-01-06

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

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

    IZ40921

Fix information

  • Fixed component name

    DB2 POFE

  • Fixed component ID

    5724N7700

Applicable component levels

  • R910 PSN

       UP

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Document Information

Modified date:
06 January 2009