PM53105: LIU COMPARE UTILITY HAS A PERFORMANCE ISSUE WHEN COMPARING LARGE NUMBER OF DBDS/PSBS

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• LIU Compare utility's execution time of comparing DBDs/PSBs
  increases more than increase rate of the number of DBDs/PSBs. So
  when comparing large number of DBDs/PSBs, the LIU Compare
  utility takes many hours for its execution time.
  

Local fix

• N/A
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: IMS Library Integrity Utilities for z/OS,    *
  *                 Version 2 Release 1 (FMID=H27P210) users     *
  *                 who use the DBD/PSB/ACB Compare utility.     *
  ****************************************************************
  * PROBLEM DESCRIPTION: DBD and PSB Compare have performance    *
  *                      issue when comparing large number of    *
  *                      DBDs or PSBs.                           *
  ****************************************************************
  * RECOMMENDATION: Apply the maintenance for this APAR.         *
  ****************************************************************
  The Compare utility has two types of compare functions, Block
  level compare function and Source level compare function.
  This APAR improves performance of both of the functions.
  
  This APAR changes the Block level compare function to reduce
  the number of I/O access for the DBDLIB and PSBLIB
  by caching list of members. It can reduce most of execution time
  when comparing large number of DBDs or PSBs.
  
  This APAR also changes the Source level compare function
  not to generate source of DBDs or PSBs when there are no
  differences when comparing the same name members.
  It can reduce some of execution time when comparing large number
  of same name members of DBDLIB or PSBLIB.
  The performance improvement depends on the number of members
  that are differences found.
  

Problem conclusion

• The following modules which have been modified to resolve the
  performance issue when comparing large number of DBDs or PSBs.
  
   FABLACB0, FABLDBD0, FABLPSB0, FABLADP0, FABLCMPR, FABLLOAD
   FABLADPL, FABLMSG
  

Temporary fix

Comments

• ×**** PE12/11/12 PTF IN ERROR. SEE APAR PM76894  FOR DESCRIPTION
  

APAR Information

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

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

  UK75116

Modules/Macros

• FABLACB0 FABLADPL FABLADP0 FABLCMPR FABLDBD0
  FABLLOAD FABLPSB0
  

Fix information

• Fixed component name

  IMS LIBR INTEG

• Fixed component ID

  5655I4200

Applicable component levels

• R210 PSY UK75116

     UP11/12/29 P F112

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.