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Paul,
Try this:
select ( s.service_seconds + w.wait_seconds) / user_calls service_time
from (
select
(sum(value)/100) / ( 3600 * 24 ) service_seconds
from v$sysstat
where upper(name) like '%CPU%'
and class in (1,64) -- User and SQL
) s,
(
select
sum(time_waited/100) wait_seconds
from v$system_event
where event not like '%timer'
and event not like '%from client'
) w,
(
select
sum(value) user_calls
from v$sysstat
where name like 'user%'
) u
/
While you may find this a useful number as a DBA, I'll bet your users won't
buy it.
On my SAP system it shows a 0.025 second reponse time. While that may be
accurate on a per call database, I don't think many queries are returned
that quickly. :)
Could be that I'm not getting the right numbers, but I don't believe that
determining
an average response time is quite that simple.
Jared
Paul.Parker@bm
wna.com To: Multiple recipients of list ORACLE-L
<[EMAIL PROTECTED]>
Sent by: cc:
[EMAIL PROTECTED] Subject: Average response time
om
09/14/01 09:35
AM
Please respond
to ORACLE-L
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Hi List,
I am trying to calculate the average database response time for a data
center audit currently underway. Without "expensive" monitoring tools, is
it possible to determine this from database statistics. So far, I'm using
(Service Time + Wait Time) / calls where this translates into
Service Time = 'CPU used by this session' from v$sysstat
Wait Time = sum(time_waited) from v$system_event (excluding idle
events)
User calls = 'user calls' from v$sysstat
Am I way off the mark here?
Interestingly, it seems as if Craig Shallahamer (www.orapub.com) is
preparing a paper which addresses this very issue - determing response time
from database statistics - but it is only due out later this year.
Anybody with any ideas or reasons why the above is not feasible?
TIA
Paul
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