PH23924: IIDR CDC FOR Z/OS CAN CONSUME EXCESSIVE CPU CYCLES DURING PERIODS OF NO DATA TO REPLICATE.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• During periods when there is no data to replicate, if the Log
  Data Cache feature is engaged, the DLR (Log Data Cache Reader)
  task continues to check for more log data without waiting for
  notification that such a check is warranted.  This can cause
  excessive calls to the DB2 IFI, using large amounts of CPU
  without benefit.
  

Local fix

• Disable the log cache feature
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: Users of IIDR CDC for z/OS who engage the    *
  *                 Log Data Cache feature.                      *
  ****************************************************************
  * PROBLEM DESCRIPTION: When IIDR CDC for z/OS is running but   *
  *                      no subscriptions are active, the Log    *
  *                      Data Cache feature Log Reader task      *
  *                      requests data from the DB2 IFI even     *
  *                      though it is not warranted.  This will  *
  *                      increase the use of CPU resources       *
  *                      unnecessarily.                          *
  ****************************************************************
  * RECOMMENDATION: APPLY CORRECTIVE SERVICE                     *
  ****************************************************************
  
  CPU use will be unnecessarily high when no subscriptions are
  running.
  

Problem conclusion

• The Log Data Cache feature Log Reader task will wait for a
  subscription to start before requesting log data.
  

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:

  UI69825

Modules/Macros

•    CHCDLRGP CHCDSCPF CHCDSLGP CHCLGPDL HCHCA21J
  

Fix information

• Fixed component name

  INFO SRVR CDC Z

• Fixed component ID

  5655U7600

Applicable component levels

• RA21 PSY UI69825

     UP20/06/16 P F006

Fix is available

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