BP82 - Buffer Pool Placeholder when Object not Found

This Natural profile parameter specifies whether or not a placeholder is put into the Natural Buffer Pool when an object was not found in a library.

Possible settings ON When an object was not found, a placeholder is put into the buffer pool.

Notes:

  1. From the buffer pool manager's point of view, the placeholder is an ordinary Natural object. For the Natural object loader, it is an indicator that the object does not exist and that there is no need to look for it in the system file.
  2. For further details, see Example.
OFF When an object was not found, no placeholder is put into the buffer pool.
Default setting OFF  
Dynamic specification yes  
Specification within session no  

Example:

Assume the Natural buffer pool is empty, you have started Natural with the parameter STEPLIB=XYSTEP, made a LOGON to library XYLIB, trying to execute the program XYPROG, which resides in library SYSTEM/FUSER. While loading the program XYPROG, Natural searches the object firstly in library XYLIB, secondly in library XYSTEP, and finally finds it in SYSTEM/FUSER.

When the profile parameter BPSFI (Object Search First in Buffer Pool) is set to OFF, every user doing the same will also make database calls to search for the object XYPROG in library XYLIB and XYSTEP, but these database calls will never succeed. To prevent these unnecessary database calls, a placeholder is put into the buffer pool.

When you use the SYSBPM utility to look into the buffer pool, you will see the placeholder as an ordinary object: 

14:34:39             ***** NATURAL SYSBPM UTILITY *****             2011-05-02
BPNAME QA82GBP                - List Objects -                 Type Global Nat
BPPROP OFF                                                       Loc DAEF QA82
C  Library  Object    DBID  FNR Loc RLD Use Max  Reuse     TotalUC ObjSize Sto
   *_______ ________ _____ ____ ___ ___ ___ ___ ______ ___________ _______ ___
__ XYLIB    XYPROG      10   32 B             1                  1      90   4
__ SYSTEM   XYPROG      10   32 B             1                  1   2,656   4
__ XYSTEP   XYPROG      10   32 B             1                  1      90   4