IBM Support

IT30877: UPDATE STATS LOW USING SAMPLING CAN CAUSE -NAN VALUES IN SYSFRAGMENTS AND SYSINDEXES IN INDEX WITH FOT

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APAR status

  • Closed as program error.

Error description

  • Consider a large table with 600 Mio rows and on this table there
    is a FOT index
    created on a serial column with unique values. When an update
    statistics low
    on this table/index is made and USTLOW_SAMPLE is set to 1, every
    second run
    on this update statistics returns -1223 on selects on
    sysfragments and sysindexes
    
    The problem column on sysfragments is the leaves colum.
    
    Additionally, queries on this table having a filter which can
    use the FOT index as
    the access path, it may return an -768 during the optimization
    of the query.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * Users of Informix Server prior to 12.10.xC14 and 14.10.xC4.  *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Update to Informix Server 12.10.xC14 or 14.10.xC4.           *
    ****************************************************************
    

Problem conclusion

  • Fixed in Informix Server 12.10.xC14 and 14.10.xC4.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT30877

  • Reported component name

    INFORMIX SERVER

  • Reported component ID

    5725A3900

  • Reported release

    C10

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2019-11-07

  • Closed date

    2020-02-27

  • Last modified date

    2020-02-27

  • 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

    INFORMIX SERVER

  • Fixed component ID

    5725A3900

Applicable component levels

[{"Business Unit":{"code":"BU048","label":"IBM Software"},"Product":{"code":"SSGU8G","label":"Informix Servers"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"C10","Edition":"","Line of Business":{"code":"","label":""}}]

Document Information

Modified date:
27 February 2020