PM05793: HIGH CPU IN PE SERVER SUBTASK COLLECTING SNAPSHOT HISTORY MODULES DGOVHM00 DGOVHMS1

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• PE Server subtask collecting SNAPSHOT history data begins
  consuming CPU time, with messages below may be found in the
  SYSPRINT data set of the server:
   FPEV0158W  DB2A DATA SERVER DETECTED HIGH CYCLE TASK (70%)
   FPEV0158W  DB2A DATA SERVER DETECTED HIGH CYCLE TASK (63%)
   FPEV0158W  DB2A DATA SERVER DETECTED HIGH CYCLE TASK (73%)
   FPEV0158W  DB2A DATA SERVER DETECTED HIGH CYCLE TASK (72%)
   FPEV0162W  DB2A TRACES ARE STARTED FOR FURTHER ANALYSIS OF HIGH
              SUBTASK FOR FURTHER ANALYSIS OF HIGH SUBTASK USAGE
   FPEV0161W  DB2A TASK DGOVHM00 WAS RESTARTED DUE TO CONTINOUES
              HIGH CPU USAGE
   FPEV0028E  DB2A TASK DGOVHM00 ABENDED. CODE 13E
   FPEV0013I  DB2A TASK DGOVHM00 BEING REATTACHED
  A CONSOLE DUMP showed the TCB for DGOVHM00 consumed by far the
  most CPU, with SYSTRACE showing repetitive entries for DGOVHMTC
  (at PK80283 level) mostly at offsets +C4, +6D6, and +992.
  

Local fix

• Turn off Snapshot History
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: OMEGAMON XE for DB2 PE/DB2PM                 *
  *                 users of component:                          *
  *                 -   PE Server subtask                        *
  ****************************************************************
  * PROBLEM DESCRIPTION: High CPU in PE Server subtask module    *
  *                      DGOVHM00.                               *
  *                                                              *
  ****************************************************************
  * RECOMMENDATION: Apply this PTF                               *
  *                                                              *
  ****************************************************************
  PROBLEM SUMMARY:
  When the Snapshot History data set contains inconsistent data,
  module DGOVHM00 of the PE Server subtask can enter an infinite
  loop while the data set is read during initialization of the
  Snapshot History monitoring task.
  
  PROBLEM CONCLUSION:
  When the Snapshot History monitoring task starts up, it first
  reads control information for the stored data from the data set.
  The control information is checked for consistency. When the
  check is passed, the data set is read and Snapshot History
  monitoring continues. When the check fails, the current data set
  is saved and a new Snapshot History data set is allocated to
  continue Snapshot History monitoring.
  The code has been changed to better synchronize the control
  information and snapshot data when they are stored to the data
  set under exceptional conditions, as for example temporary I/O
  problems.
  

Problem conclusion

• When the Snapshot History monitoring task starts up, it first
  reads control information for the stored data from the data set.
  The control information is checked for consistency. When the
  check is passed, the data set is read and Snapshot History
  monitoring continues. When the check fails, the current data set
  is saved and a new Snapshot History data set is allocated to
  continue Snapshot History monitoring.
  The code has been changed to better synchronize the control
  information and snapshot data when they are stored to the data
  set under exceptional conditions, as for example temporary I/O
  problems.
  
  The service level of the
  OMEGAMON collector PE Server subtask
  FPEV0000I  DATA SERVER INITIALIZATION
  FPEV0114I  PTF BUILD IS 10.056
  
  
  
  KEYWORDS :
  DUMP HIGH CPU DGOVHM00 SNAPSHOT HISTORY
  

Temporary fix

Comments

APAR Information

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

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

  UK54668 UK54669

Modules/Macros

• DGO@DB2I DGOVDB2I DGOVHMCD DGOVHMDR DGOVHMM0
  DGOVHMM1 DGOVHMSD DGOVHMS1 DGOVHMTC DGOVHMTX DGOVHM00 DGOVMB
  DGOVMIDI DGOVMSTR DGOVM001 DGOVM002 FPE@DB2I FPEVDB2I FPEVTMEM
  

Fix information

• Fixed component name

  OM XE DB2PE/PM

• Fixed component ID

  5655OPE00

Applicable component levels

• R410 PSY UK54668

     UP10/03/02 P F003

• R420 PSY UK54669

     UP10/03/02 P F003

Fix is available

• Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.