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IBM Informix OnLine Database Server Administrator’s Guide

Monitor buffer-pool activity to determine the general availability of buffers
and to isolate the activity that is triggering buffer-pool flushing. (Refer also
to

 for general buffer statistics.)

The tbstat -p output contains the following two statistics that describe buffer
availability:

Refer to

 for further information about the tbstat -p output.

From the command line, execute tbstat -F to obtain a count of the writes
performed by write type. Refer to

following write types:

■

Foreground write

■

LRU

 write

■

Idle write

■

Chunk write

In addition, tbstat -F lists the following page-cleaner information:

■

Page-cleaner number and shared-memory address

■

Current state of the page cleaner

Details about the function and activities of the page-cleaner daemon
processes are described on

 for further infor-

mation about the tbstat -F output.

ovbuff

lists the number of times that OnLine attempted to exceed the
maximum number of shared buffers,

BUFFERS

. (The

ovbuff

field appears in the third row of output, fourth position.)

bufwaits

lists the number of times processes waited for a buffer (any
buffer). (The

bufwaits

 field appears in the fourth row of

output, first position.)