PQ78371: PERFORMANCE IMPROVEMENTS.

Obtain the fix for this APAR.

APAR status

• Closed as new function.

Error description

• Performance improvements.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of IBM IMS High Performance        *
  *                 Load for OS/390 Release 1 (FMID=H1IM110).    *
  ****************************************************************
  * PROBLEM DESCRIPTION: This APAR provides Performance          *
  *                      improvements.                           *
  ****************************************************************
  * RECOMMENDATION: Apply the maintenance for this APAR.         *
  ****************************************************************
  This APAR provides following Performance improvements:
  (1) to improve BSAM access efficiency to change the timing of
      buffer write for OSAM databases. The default value for the
      database buffer specification has been modified also.
      This reduces the elapsed time for OSAM databases.
  (2) to avoid high CPU time consumption on a z900 server.
      This reduces the CPU time for both OSAM and VSAM databases.
  

Problem conclusion

Temporary fix

Comments

• (1)The modules HPSRBFRM, HPAROSAM, HPSRMSGT and HPSRRRIN have
     been modified to improve BSAM access efficiency.
  (2)The module HPSRPTRS has been modified to avoid high CPU
     consumption on a z900 server.
  *
  ========================
  = DOCUMENTATION CHANGE =
  ========================
  Documentation Changes:
  IMS High Performance Load User's Guide (SC27093802) should be
  changed as follows:
  ------------------------------------------------------------
  
  2.0 Chapter 4.  High Performance Load
  2.2  Operation Instructions
  2.2.3  Input
  2.2.3.1  FRRIN Data Set
  :
  2.2.3.1.2 Overview of High Performance Load Control Statements
  :
    +------------------------------------------------------------+
    | Table 4. High Performance Load Control Statements for      |
    | Performance                                                |
    +-------------+-----------+----------------+-----------------+
    | Keyword     | Accepted  | Default        | Description     |
    |             | Values    |                |                 |
    +-------------+-----------+----------------+-----------------+
    | :           | :         | :              | :               |
    +-------------+-----------+----------------+-----------------+
  | | DBRLBUF=    | 1-999     | 150 (for VSAM) | Sets the number |
  | |             |           | 45  (for OSAM) | of High         |
    |             |           |                | Performance     |
    |             |           |                | Load buffers    |
    +-------------+-----------+----------------+-----------------+
  2.2.3.1.14 DBRLBUF Control Statement
  :
    If this control statement is not specified, DBRLBUF=150 is
  | assumed for VSAM, and DBRLBUF=45 is assumed for OSAM ;
  | that is, 150 or 45 tracks worth of buffers are acquired.
    nnn Specifies a left-justified decimal number from 1 to 999.
  
    Note: You can reduce EXCPs by increasing the amount of
          database buffers.
  |       And for OSAM, the amount of database buffers must be
  |       greater than the amount of access method buffers + 10
  |       tracks. High Performance Load internally adjusted the
  |       amount of database buffers, if the amount of database
  |       buffers is insufficient.
          Select an appropriate value for the amount of database
          buffers based on your execution environment.
  
  2.2.3.1.15 BUFFERNO Control Statement
  
  :
    If this control statement is not specified, the DBRLBUF
    specification is used. If neither BUFFERNO= nor DBRLBUF= is
  | specified, DBRLBUF=150 is assumed for VSAM, and DBRLBUF=45 is
  | assumed for OSAM.
  
    Note: You can reduce EXCPs by increasing the number of
          database buffers.
  |       And for OSAM, the amount of database buffers must be
  |       greater than the amount of access method buffers + 10
  |       tracks. High Performance Load internally adjusted the
  |       amount of database buffers, if the amount of database
  |       buffers is insufficient.
          You should select the suitable value for the number of
          database buffers based on your execution environment.
  :
  APPENDIX1.3 Appendix C. Messages and Codes
  APPENDIX1.3.3 Messages
  APPENDIX1.3.3.1 High Performance Load Messages
  >> Following new messages are added.
  HPSR0040I THE AMOUNT OF DATABASE BUFFERS ADJUSTED
  Explanation: High Performance Load adjusted the amount of
  database buffers specified by the DBRLBUF statement or the
  BUFFERNO statement. The amount of database buffers is adjusted
  as Following formula:
   The amount of the access method buffers(*1) + 10 tracks
    *1
    Specified by the DBIOBUF statement or JCL
  System Action:  The amount of database buffers is adjusted and
  High Performance Load continues processing.
  Programmer Response:  None.
  Problem Determination:  None.
  

APAR Information

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

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

  UQ80860

Modules/Macros

•    HPSRBFRM HPSRMSGT HPSROSAM HPSRPTRS HPSRPTR6
  HPSRPTR7 HPSRPTR8 HPSRRRIN HPSRRRI0 HPSRRRI9
  

Fix information

• Fixed component name

  IMS HIGH PERF L

• Fixed component ID

  5655E0700

Applicable component levels

• R110 PSY UQ80860

     UP03/10/08 P F310

Fix is available

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