PI76987: THE DEGREE OF INDEX PARELLELISM IS CALCULATED TOO CONSERVATIVE WITH UNLOAD/RELOAD PARALLELIM AND SORTDATA NO

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• The degree of index parallelism is calculated too conservative
  with unload/reload parallelism and SORTDATA NO.  DB2 calculates
  the degree of parallelism based on doing data sorts, however
  the REORG was run with SORTDATA NO. DB2 should not assume
  memory needed for large data sorts and rather spend most of
  the memory and assign it ot the index sorts
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All DB2 11 for z/OS REORG utility users      *
  *                 using SORTDATA NO on partitioned table       *
  *                 spaces with many indexes                     *
  ****************************************************************
  * PROBLEM DESCRIPTION: The degree of index sort parallelism    *
  *                      may not be optimal when REORG unload/   *
  *                      reload parallelism for partitions is    *
  *                      in effect with SORTDATA NO processing   *
  *                      and a large number of indexes are       *
  *                      defined. This could have a negative     *
  *                      effect on elapsed time.                 *
  ****************************************************************
  * RECOMMENDATION: Apply corrective PTF when available          *
  ****************************************************************
  REORG reserved memory resources for parallel data sorts which
  caused less memory to be assigned to parallel index sorts which
  could degrade the possible degree of index sort parallelism.
  

Problem conclusion

• Code has been changed to correctly calculate needed memory
  resources when using SORTDATA NO with unload/reload parallelism.
  

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:

  PI80365 UI47291

Modules/Macros

• DSNURPCT
  

Fix information

• Fixed component name

  DB2 OS/390 & Z/

• Fixed component ID

  5740XYR00

Applicable component levels

• RB10 PSY UI47291

     UP17/06/01 P F705

Fix is available

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