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Operating OnLine 3-67
Monitor Buffers
tbstat -B
Execute tbstat -B to obtain the following buffer statistics:
■ Address of every regular shared-memory buffer
■ Page numbers for all pages remaining in shared memory
■ Address of the first user process waiting for each buffer
Refer to page 7-84 for further information about the tbstat -B output.
tbstat -p
Execute tbstat -p to obtain statistics about cached reads and writes. The
caching statistics appear in four fields on the top row of the output display.
The first pair of statistics appears in the third and fourth positions:
The second pair of statistics appears in the seventh and eighth positions of
the top row of the display:
Note that the number of reads or writes can appear as a negative number if
the number of occurrences exceeds 2
32
. To reset the profile counts, execute
tbstat -z.
Refer to page 7-92 for further information about the tbstat -p output.
Execute tbstat -P to obtain the tbstat -p display, with an additional field,
BIGreads, the number of big-buffer reads. Refer to page 2-55 for further
information about the big buffers.
bufreads
is the number of reads from shared-memory buffers.
%cached is the percentage of reads cached.
bufwrits
is the number of writes to shared memory.
%cached
is the percentage of writes cached.