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IC68229: POOL_XDA_L_READS AND POOL_XDA_P_READS COLUMNS OF SYSIBMADM.SNAPDB SEEMS TO BE REVERSE.

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APAR status

  • Closed as program error.

Error description

  • POOL_XDA_L_READS and POOL_XDA_P_READS columns of view
    SYSIBMADM.SNAPDB seems to be reverse. Seems, there is a miss
    assignment of the values to  the column names in
    SYSIBMADM.SNAPDB in V9.7.
    
    The get snasphot for database output retrieves the following
    counters :
    db2 get snapshot for database on sample | grep xda
    
    Buffer pool xda logical reads              = 97
    
    Buffer pool xda physical reads             = 22
    
    Buffer pool temporary xda logical reads    = 0
    
    Buffer pool temporary xda physical reads   = 0
    
    Buffer pool xda writes                     = 34
    
    Asynchronous pool xda page reads           = 0
    
    Asynchronous pool xda page writes          = 0
    
    Asynchronous xda read requests             = 0
    
    
    If we compare with sysibmadm.snapdb information, the logical and
     physical read counters for xda data are wrong.
    
    db2 "select POOL_XDA_L_READS ,POOL_XDA_P_READS  from
    sysibmadm.snapdb"
    
    POOL_XDA_L_READS       POOL_XDA_P_READS
    --------------------------        --------------------
    
        22                                             97
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * DB2 LUW                                                      *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * POOL_XDA_L_READS and POOL_XDA_P_READS columns of view        *
    * SYSIBMADM.SNAPDB seems to be reverse. Seems, there is a miss *
    * assignment of the values to  the column names in             *
    * SYSIBMADM.SNAPDB in V9.7.                                    *
    *                                                              *
    * The get snasphot for database output retrieves the following *
    * wrong counters :                                             *
    *                                                              *
    * db2 get snapshot for database on sample | grep xda           *
    *                                                              *
    * Buffer pool xda logical reads              = 97              *
    *                                                              *
    * Buffer pool xda physical reads             = 22              *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * The customer has to include this fix . The fix is going to   *
    * release in V97FP3.                                           *
    ****************************************************************
    

Problem conclusion

  • The Fix is going to include in the V97FP3.
    
    The customer will see the correct order values of
    POOL_XDA_L_READS and POOL_XDA_P_READS after including the fix.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IC68229

  • Reported component name

    DB2 FOR LUW

  • Reported component ID

    DB2FORLUW

  • Reported release

    970

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2010-04-28

  • Closed date

    2011-05-09

  • Last modified date

    2011-05-09

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

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

    IC69656

Fix information

  • Fixed component name

    DB2 FOR LUW

  • Fixed component ID

    DB2FORLUW

Applicable component levels

  • R970 PSY

       UP



Document information

More support for: DB2 for Linux, UNIX and Windows

Software version: 9.7

Reference #: IC68229

Modified date: 09 May 2011