PI87526: CDC FOR Z/OS WITH THE LOG DATA CACHE FEATURE ENABLED WILL CONTINUE TO HOLD A LOG DATA SET IF NO SUBSCRIPTIONS ARE ACTIVE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• When an instance of IIDR CDC for z/OS is configured with the
  Log Data Cache feature enabled, and then brought up, the cache
  reader task (DLR) issues an IFI READS request for log data that
  would continue to extend the data currently in the cache. If it
  finds that there are no subscriptions active that can use that
  data, it suspends until a subscription is started. In doing so,
  it does not release the position in the DB2 Log that was
  acquired by the IFI READS request it issued. This position
  remains held, and the log data set remains open until either a
  subscription starts, allowing progression through the log data
  set, or the instance of IIDR CDC for z/OS is shut down. This
  can render a DB2 Log archive data set residing on tape
  unavailable for other purposes
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: Users of IIDR CDC for z/OS who employ the    *
  *                 Log Data Cache feature.                      *
  ****************************************************************
  * PROBLEM DESCRIPTION: If IIDR CDC for z/OS is started with    *
  *                      the Log Data Cache feature engaged, and *
  *                      no subscriptions are started, the Log   *
  *                      Reader task of the feature will read    *
  *                      the DB2 Log, then pause to wait for a   *
  *                      subscription to use the data.  While it *
  *                      is pausing, it is holding the DB2 Log   *
  *                      data set.  If this log data set is an   *
  *                      archive tape, then that data set is not *
  *                      available for anything else that may    *
  *                      need to read it.                        *
  ****************************************************************
  * RECOMMENDATION: APPLY CORRECTIVE SERVICE                     *
  ****************************************************************
  
  The Log Cache Data feature may hold DB2 Log data sets for an
  indefinite amount of time if no subscriptions are running.
  

Problem conclusion

• If no subscriptions are running, the Log Reader task will
  release the DB2 Log data set it is reading until a subscription
  needs some data.
  

Temporary fix

Comments

• ×**** PE17/12/07 FIX IN ERROR. SEE APAR PI91214  FOR DESCRIPTION
  

APAR Information

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

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

  UI51421

Modules/Macros

•    CHCDLRGP CHCSVBCS CHCTTSSV CHCTTSSW HCHCA21J
  

Fix information

• Fixed component name

  INFO SRVR CDC Z

• Fixed component ID

  5655U7600

Applicable component levels

• RA21 PSY UI51421

     UP17/11/28 P F711

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.