PK58920: PERFORMANCE ISSUES RELATED TO EXCP USAGE AND ELAPSED TIMES FOR SUBORDINATE ADDRESS SPACE

APAR status

• Closed as program error.

Error description

• The implementing of changes to VSAM and OSAM buffer management,
  in order to improve EXCP usage and elapse times for Subordinate
  Address Space processing will improve DRF performance.
  DRF currently uses the default number of buffers when writing
  VSAM ESDS's,  This will be changed to BUFND=255 in order to
  reduce EXCP counts and avoid excessive IO in the SAS.
  OSAM buffers will be changed from 55 to 255, to optimize EXCP's
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: Performance problems reported by La Caxia.   *
  *                 This change will improve EXCP counts for all *
  *                 users.                                       *
  ****************************************************************
  * PROBLEM DESCRIPTION: Performace enharnsements relating to    *
  *                      EXCP counts for output database in Subo *
  *                      rdinate address space for OSAM and VSAM *
  *                      databases optimized.                    *
  *                                                              *
  ****************************************************************
  * RECOMMENDATION: INSTALL CORRECTIVE SERVICE FOR APAR/PTF      *
  ****************************************************************
  This is a performance fix for OSAM and VSAM databases. The
  number of buffers used during OPEN is optimized to allow for
  more efficient EXCP conuts and reduced service units during the
  write phase in the Sunordinate Address Space
  

Problem conclusion

•  AIDS: RIDS/UTIL RIDS/DBS DBS/UTIL
    GEN:
  
  *** END IMS KEYWORDS ***
  Improve EXPS and overall elapsed time for Subordinate Address
  space by optimizing number of buffers used during OPEN.
  

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:

  UK33811

Modules/Macros

•    FRXIVCN0
  

Fix information

• Fixed component name

  IMS DB RECOVERY

• Fixed component ID

  5655I4400

Applicable component levels

• R310 PSY UK33811

     UP08/02/20 P F802