Detecting checkpoint effects

When a checkpoint command specifies SNAPQ, the current status of all message queues is written to the system log. This prevents any message handling on behalf of queue management.

The General Iwait Time Events records the wait time incurred by the SNAPQ. The following example shows the activity on the summary line QMGR SNAPQ CHECK. The number of occurrences is given with the total, average, and maximum wait times.

      IMS MONITOR  ** GENERAL REPORTS **    TRACE START 1993 130   5:55:15    TRACE STOP  1993 130   5:59:49  PAGE 0009
                GENERAL IWAIT TIME EVENTS
    EVENT                              ..........IWAIT TIME...........    DISTRIBUTION
    IWAITS          OCCURRENCES        TOTAL         MEAN      MAXIMUM       NUMBER
    ______          ___________        _____         ____      _______       ______
QMGR SNAPQ CHECK              0            0            0            0            0
                REGION AND JOBNAME REPORT
REG. NO.   JOB NAME
________   ________
     1     MPR1A100
     2     MPR1A209
     3     MPR1A210
     4     MPR1A211
     5     MPR1A103
     6     MPR1A101
     7     MPR1A115
     8     MPR1A116
     9     MPR1A216
    10     MPR1A200
    11     MPR1A217
    12     MPR1A119
    13     MPR1A218
    14     MPR1A219
    15     MPR1A104
    16     MPR1A220
    17     MPR1A203
    18     MPR1A123
    19     MPR1A222
    20     MPR1A105
    21     MPR1A124
    22     MPR1A223
    23     MPR1A107
    24     MPR1A224
    25     MPR1A106
    26     MPR1A206
    27     MPR1A205
    28     MPR1A108
    29     MPR1A109
    30     MPR1A208
    31     MPR1A111
    32     MPR1A112
    33     MPR1A113
    34     MPR1A204
    35     MPR1A114
    36     MPR1A102
    48     MPR1A121
    49     MPR1A122
    50     MPR1A221