Using the Interval Monitor › Buffer History

Buffer History

 PM-Rnn.n SYSTEM71         CA, Inc.                  V71      08.348 11:28:41.90
 CMD-->                                                             Window : 02

   02 09:45 BUHS Buffer History
   Start Waits   Wait    Avg         .2        .4        .6        .8         1
    Time         Time   Wait ---------|---------|---------|---------|---------|
 _ 09:45     0 .0000S .0000S
 _ 09:50     1 .0285S .0285S -
 _ 09:55     2 .0312S .0156S
 _ 10:00     2 .0371S .0185S
 _ 10:05     4 .0709S .0177S
 _ 10:10   110  3.62S .0329S -
 _ 10:15    47  1.40S .0299S -
 _ 10:20    26 .7701S .0296S -
 _ 10:25   100  2.20S .0220S -
 _ 10:30    97  1.59S .0164S
 _ 10:35    32 .5837S .0182S
 _ 10:40   198  3.42S .0173S
 _ 10:45    32 .7642S .0238S -
 _ 10:50    23 .5983S .0260S -
 _ 10:55    33 .7659S .0232S -
 _ 11:00     0 .0000S .0000S
 _ 11:05     6 .3406S .0567S --
 _ 11:10     2 .0507S .0253S -

Screen Description

The Buffer History screen displays each interval being tracked. For each interval, the screen shows a total count and time for buffer waits that occurred when a database or journal buffer was requested but was not available.

This screen also shows the average wait time for the interval. The average wait time is displayed numerically and in graph form.

Buffer waits include:

• Waits on a buffer pool
• Waits on a buffer page

Using This Screen

• To request the Wait Type by Interval screen for a specific interval, type any other nonblank character to the left of the interval for which the detail is required and press [Enter].
• To request the Detail screen for the same interval, press [PF9].

What To Look For

Look at the graphic display for intervals with higher than average waits.