4. EXCEPTIONS › 4.3 Detailed Exception Descriptions › 06041: DMB Latch Conflict Rate Exceeds Standard

06041: DMB Latch Conflict Rate Exceeds Standard

    FILE:            IMS System Activity
    SAS FILE NAME:   DETAIL.IMSISY01
    SOURCE LOCATION: sharedprefix.MICS.SOURCE(DYIMSEXC)

    SEVERITY:        Warning       (SEVERITY='W')
    MANAGEMENT AREA: Performance   (MGMTAREA='PERFORMANCE')

    PURPOSE:   Identifies that system processing may be
over-committed.

    RATIONALE:  An abnormally high number here may represent
system over-commitment.  The latches are used to serialize
access to DMBs by DL/I modules.  There is one latch per DMB.
Also included in this count are conflicts for the ISAM/OSAM
buffer handler.  There is one of these latches per subpool.
There is little remedy for this situation other than
decreasing the number of PSTs or decreasing the time the
latches are held via hardware changes.  Only large values
should be of concern.

    DEFINITION:  This exception is detected when the DMB
latch conflict rate exceeds the installation-defined limit.
It does not apply to IMS 4.1 and higher systems.

    EXCEPTION STATEMENTS:  The SAS statements identifying the
exception situation and describing the condition are stored
in the source member named in SOURCE LOCATION and are
described below:

*
**  06041
**  DMB LATCH CONFLICT RATE EXCEEDS STANDARD
*;
IF ISYPSLGN > DMB-latch-conflict-rate
 THEN DO;
  EXCCODE='06041'; SEVERITY='W'; MGMTAREA='PERFORMANCE';
  EXCDESC1=
  'DMB LATCH CONFLICT RATE EXCEEDS STANDARD';
  EXCDESC2='DMB LATCH CONFL RATE ='
           || PUT(ISYPSLGN,7.2);
  LINK HIT;
END;

    THRESHOLD MODIFICATION:  Modify the value used for the
DMB-latch-conflict-rate.