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IT39594: SQLTRACE - RUN TIME, PAGE READ, BUFFER READ ARE SHOWING WRONG STATISTICS

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • When OPTCOMPIND is 2 and '2K dbspace' is used, SQLTRACE for
    <SELECT> query, which has 'Functional Predicate' and 'LIKE'
    operator chosing <SEQUENTIAL SCAN> shows Wrong Statistics values
    for
    1) Run Time
    2) Page Read
    3) Buffer Read
    
    The values for above 3 columns are showing very Less compared to
    SQEXPLAIN, though SEQUENTIAL SCAN is used.
    
    select seo1_id from se_out_mt1nn where ucase(seo1_21) like
    'TEST-5555%' ;
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * Users of Informix Server prior to 14.10.xC8.                 *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Upgrade to Informix Server 14.10.xC8.                        *
    ****************************************************************
    

Problem conclusion

  • Fixed in Informix Server 14.10.xC8.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT39594

  • Reported component name

    INFORMIX SERVER

  • Reported component ID

    5725A3900

  • Reported release

    E10

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2022-01-10

  • Closed date

    2022-04-07

  • Last modified date

    2024-09-24

  • 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":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSGU8G","label":"Informix Servers"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"E10","Line of Business":{"code":"LOB10","label":"Data and AI"}}]

Document Information

Modified date:
25 September 2024