PK58222: IMPROVE EFFICIENCY AND MAINTAINABILITY OF THE UNIT OF RECOVERY MANAGER ALGORITHM

APAR status

• Closed as program error.

Error description

• Unit of Recovery Manager module FRXUORM0 is improved to be more
  efficient and the algorithm is simplified for maintainability.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: IMS Database Recovery Facility for z/OS      *
  *                 Version 3 Release 1                          *
  ****************************************************************
  * PROBLEM DESCRIPTION: The logic for use of data space         *
  *                      storage for Point in Time Recovery,     *
  *                      PITR, causes inefficient memory use     *
  *                      and difficulty in maintenance.          *
  ****************************************************************
  * RECOMMENDATION: INSTALL CORRECTIVE SERVICE FOR APAR/PTF      *
  ****************************************************************
  The buffer management logic for PITR processing
  requires repeated scanning of linked lists to
  reverse the ordering of the buffers.  Also,
  there is unnecessary movement of buffers to and
  from data spaces .
  

Problem conclusion

• AIDS: RIDS/UTIL RIDS/DBS DBS/UTIL
   GEN:
  KEYWORDS:
  
  *** END IMS KEYWORDS ***
  Buffer management logic is changed to:
  1. eliminate the need to reverse list ordering.
  2. never move any buffer more than once to a
     data space.
  3. simplify module logic to facilitate future
     maintenance.
  
  
  FRXUORM0: linked list processing is simplified,
  access to data space storage is minimized.
  

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:

  UK41186

Modules/Macros

• FRXUORM0
  

Fix information

• Fixed component name

  IMS DB RECOVERY

• Fixed component ID

  5655I4400

Applicable component levels

• R310 PSY UK41186

     UP08/10/31 P F810