PH02860: THE "OVERALL CACHE EFFICIENCY" FIGURE IN THE CACHE USAGE STATS MAY BE INCORRECT IF THE CALCULATED DATA VALUES ARE LARGE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Due to the size of the fields used to store the statistics for
  the Log Data Cache feature and the calculation used to
  determine the "Overall Cache efficiency" percentage, it is
  possible for an intermediate value in the calculation of the
  percentage to overflow, rendering the percentage calculated to
  be incorrect.  The statistics fields are also too small to
  reliably contain statistics for the data volumes that some
  customers may produce.
  

Local fix

• No local fix is available.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: Users of InfoSphere Change Data Capture for  *
  *                 z/OS                                         *
  ****************************************************************
  * PROBLEM DESCRIPTION: The "Overall Cache efficiency" and      *
  *                      "Level 1 Cache efficiency" values in    *
  *                      the Cache Usage Statistics might be     *
  *                      incorrect if the data values that       *
  *                      contribute to the calculation are       *
  *                      large.                                  *
  ****************************************************************
  * RECOMMENDATION: APPLY CORRECTIVE SERVICE                     *
  ****************************************************************
  The Log Data Cache statistical fields are too small to reliably
  contain statistics for the data volumes that some customers
  might produce.
  

Problem conclusion

• The size for each Log Data Cache statistical field is increased
  and the logic for calculating percentage metrics is changed to
  avoid overflow of the intermediate value during calculation.
  

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:

  UI59770

Modules/Macros

•    CHCDLRGP CHCDLRPF CHCLCCDL
  

Fix information

• Fixed component name

  INFO SRVR CDC Z

• Fixed component ID

  5655U7600

Applicable component levels

• RA21 PSY UI59770

     UP18/11/27 P F811

Fix is available

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