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IT31752: SELECT IO_WAIT_TIME_PERCENT FROM SYSIBMADM.MON_DB_SUMMARY CAN RETURN WITH "SQL0413N OVERFLOW OCCURRED DURING NUMERIC DATA TYPE C

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APAR status

  • Closed as program error.

Error description

  • The IO_WAIT_TIME_PERCENT is calculated using the following
    formula with metrics reported by the MON_GET_DATABASE interface:
    
    IO_WAIT_TIME_PERCENT = (POOL_READ_TIME + POOL_WRITE_TIME +
    DIRECT_READ_TIME + DIRECT_WRITE_TIME - POOL_ASYNC_READ_TIME -
    POOL_ASYNC_WRITE_TIME)/TOTAL_WAIT_TIME) .
    
    In some cases, IO_WAIT_TIME_PERCENT may exceed 100 percent and
    overflow with a SQL0413N error. This is because the
    MON_GET_DATABASE interface does not properly account for direct
    reads and writes performed by background system agents when
    measuring TOTAL_WAIT_TIME resulting in a TOTAL_WAIT_TIME value
    that may be less than the sum of the DIRECT_READ_TIME and
    DIRECT_WRITE_TIME values.
    

Local fix

  • Do not perform a select IO_WAIT_TIME_PERCENT from
    MON_BP_UTILIZATION, skip the
    ASYNC_NOT_READ_PERCENT column in the select.
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * all                                                          *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Upgrade to Db2 11.1.4.6 or higher                            *
    ****************************************************************
    

Problem conclusion

  • Upgrade to Db2 11.1.4.6 or higher
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT31752

  • 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

    2020-02-04

  • Closed date

    2021-03-31

  • Last modified date

    2021-03-31

  • 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":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"SSEPGG","label":"DB2 for Linux- UNIX and Windows"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"11.1","Line of Business":{"code":"LOB10","label":"Data and AI"}}]

Document Information

Modified date:
03 May 2022