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Re: disk statistics [157]

Posted By: John Miller iii
Date: Wednesday, 14 January 2009, at 11:54 a.m.

Malcolm:

There is one hole in your logic that we can quickly eliminate.
The pf_dskwrites does decrease in time when the system is
re-started or an onstat -z is executed (just like onstat).
To find out when these are done you must look at the
ph_run table for this task. The following select will provide the
information you need.

select R.run_time ,

DBINFO("utc_to_datetime",R.run_ztime) as ztime,

DBINFO("utc_to_datetime",R.run_btime) as boottime,

P.*
from ph_task, ph_run R, mon_prof P
where tk_name =3D "mon_profile"
and R.run_task_id =3D tk_id
and P.number =3D (select number from sysmaster:sysshmhdr where name
=3D'pf_dskwrites')

2009-01-14 09:44:44 pf_dskwrites 220
2009-01-14 10:00:57 pf_dskwrites 22
2009-01-14 10:09:44 pf_dskwrites 2349
2009-01-14 10:09:44 pf_dskwrites 2484
2009-01-14 10:14:44 pf_dskwrites 2533
2009-01-14 10:24:44 pf_dskwrites 2596

As for the following errors:
10:04:49 SCHAPI: Type: SENSOR, Name: mon_profile, Location: NULL.
10:04:49 SCHAPI: Error -154 ISAM error: Lock Timeout Expired
10:04:49 SCHAPI: Type: SENSOR, Name: mon_profile, Location: NULL.
10:04:54 SCHAPI: Error -271 Could not insert new row into the table.
10:04:54 SCHAPI: Type: SENSOR, Name: mon_profile, Location: NULL.
10:04:54 SCHAPI: Error -154 ISAM error: Lock Timeout Expired
10:04:54 SCHAPI: Type: SENSOR, Name: mon_profile, Location: NULL.

It looks like someone has the table locked while the database scheduler=
is
trying
to insert data intot his table. If you can run some onstats (-a -g sql =
0,
-g stm, -k, -g dbc)
and get the partnumber of the mon_prof table when this error is occurri=
ng
we
can track it down.

10:04:49 SCHAPI: Error -243 Could not position within a table
(informix.ph_task).

I am guessing this is from the sensor trying to delete
the data. We have recently added an index to the mon_prof
table (see index definition below). This will help
prevent sequential scans and allow the delete to run
without looking the entire table. Can you verify the
index is created and update stats has been run.

create index mon_prof_idx1 on mon_prof(ID, number)

John F. Miller III
STSM, Support Architect
miller3@us.ibm.com
503-578-5645
IBM Informix Dynamic Server (IDS)

=

"MALCOLM =

WEALLANS" =

<mweallans@panace =
To

a.co.uk> oat@iiug.org =

Sent by: =
cc

oat-bounces@iiug. =

org Subj=
ect

Re: [Oat] disk statistics [157]=

=

01/14/2009 06:28 =

AM =

=

=

Please respond to =

oat@iiug.org =

=

=

I have installed 11.50.FC3 for AIX and am still having the same problem=
. It

only happens once following a restart of IDS. There are errors in the
online.log file as follows:-

10:04:49 SCHAPI: Error -243 Could not position within a table
(informix.ph_task
).
10:04:49 SCHAPI: Type: SENSOR, Name: mon_profile, Location: NULL.
10:04:49 SCHAPI: Error -154 ISAM error: Lock Timeout Expired
10:04:49 SCHAPI: Type: SENSOR, Name: mon_profile, Location: NULL.
10:04:54 SCHAPI: Error -271 Could not insert new row into the table.
10:04:54 SCHAPI: Type: SENSOR, Name: mon_profile, Location: NULL.
10:04:54 SCHAPI: Error -154 ISAM error: Lock Timeout Expired
10:04:54 SCHAPI: Type: SENSOR, Name: mon_profile, Location: NULL.

and the entries in the mon_profile table for this parameter read

2009-01-14 09:44:44 pf_dskwrites 220
2009-01-14 10:00:57 pf_dskwrites 22
2009-01-14 10:09:44 pf_dskwrites 2349
2009-01-14 10:09:44 pf_dskwrites 2484
2009-01-14 10:14:44 pf_dskwrites 2533
2009-01-14 10:24:44 pf_dskwrites 2596

I guess the fix in .FC3 isn't working, or there is another problem.

regards

Malcolm

***********************************************************************=
********

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