Fluctuate in DB Performance Statistics

Dear All,
I have noticed that the DB performance statistics is not
stable as it will rise at certain time dramatically.
I have checked that there isn't any job at that time.
E.g. Server\memory/pages , Current disk queue length,
processor time
Can any one suggest on any cause this?
Thanks.most database applications today consists of a mix of
simple transactions and complex queries that process a lot
of data. this includes reports or other sophisticated
features.
if you have for example 100 concurrent users running the
simple transactions, you might see a stable load on the
server,
however, anytime someone hits one of the complex queries,
you might see cpu spike.
this is why many people recommend separating OLTP and DSS
applications. there is no such thing as a machine powerful
enough to handle both functions on one server.
the OLTP server depends on fast response times, meaning it
should operate at low cpu loading.
the DSS app is supposed to run with cpu pegged, if not,
then you should be running more DSS queries to it, you
bought the hardware, you may as well use it.
>--Original Message--
>Dear All,
>I have noticed that the DB performance statistics is not
>stable as it will rise at certain time dramatically.
>I have checked that there isn't any job at that time.
>E.g. Server\memory/pages , Current disk queue length,
>processor time
>Can any one suggest on any cause this?
>Thanks.
>.
>|||Run profiler at that time to see if it is any TSQL commands causing this. Also, it can be the
checkpoint process.
--
Tibor Karaszi, SQL Server MVP
Archive at: http://groups.google.com/groups?oi=djq&as_ugroup=microsoft.public.sqlserver
"Jackty" <anonymous@.discussions.microsoft.com> wrote in message
news:022d01c3ad86$140683a0$a601280a@.phx.gbl...
> Dear All,
> I have noticed that the DB performance statistics is not
> stable as it will rise at certain time dramatically.
> I have checked that there isn't any job at that time.
> E.g. Server\memory/pages , Current disk queue length,
> processor time
> Can any one suggest on any cause this?
> Thanks.