IBM Support

IT28622: NUMBLOCKPAGES OF A BUFFERPOOL MAY BE ADJUSTED TO AN INVALID VALUE

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APAR status

  • Closed as program error.

Error description

  • STMM tries to shrink the bufferpools by a factor
    (sqlbScaleAutoBPsByFactor()):
    FUNCTION: DB2 UDB, buffer pool services,
    sqlbScaleAutoBPsByFactor, probe:12828
    DATA #1 : <preformatted>
    Defer writing on-disk changes for BP ID=7;old size=156585; new
    size=57365
    
    In some scenario the bufferpool is shrunk to a negative size
    leading to the sqlbfix error:
    
    FUNCTION: DB2 UDB, buffer pool services,
    sqlbScaleAutoBPsByFactor, probe:12828
    DATA #1 : <preformatted>
    Defer writing on-disk changes for BP ID=8;old size=156585; new
    size=57365
    
    FUNCTION: DB2 UDB, buffer pool services,
    sqlbSetNumSlotsAndNBPForNewRTBPDef, probe:20
    MESSAGE : ADM6069W  Buffer pool "XXXXXXXX" (ID "8") has a
    NUMBLOCKPAGES value of
              "4096" which exceeds the maximum supported value for a
    buffer pool of
              this size.  The NUMBLOCKPAGES value for this buffer
    pool has been
              reduced to "-2147483648" for its current activation.
    The value of
              NUMBLOCKPAGES can be permanently changed by using the
    ALTER
              BUFFERPOOL SQL statement.
    
    FUNCTION: DB2 UDB, Common Trace API, sqlbfix, probe:1632
    DATA #1 : String, 67 bytes
    sqlbSetNumSlotsAndNBPForNewRTBPDef: max numPages has been
    exceeded!
    DATA #2 : Hexdump, 4 bytes
    0x00007FCD3AFFA620 : 5486 FEFF
    T...
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * ALL                                                          *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Upgrade to Db2 11.1.4.5 or later                             *
    ****************************************************************
    

Problem conclusion

  • Upgrade to Db2 11.1.4.5 or later
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT28622

  • 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

    2019-03-31

  • Closed date

    2019-10-31

  • Last modified date

    2019-10-31

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

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

    IT30795

Fix information

  • Fixed component name

    DB2 FOR LUW

  • Fixed component ID

    DB2FORLUW

Applicable component levels

  • RB10 PSN

       UP

[{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSEPGG","label":"Db2 for Linux, UNIX and Windows"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"11.1","Edition":"","Line of Business":{"code":"LOB10","label":"Data and AI"}}]

Document Information

Modified date:
31 October 2019