Denham,
Sorry, I didn't mean to make you wince! It's just a case of seeing way
too many DBAs spending way too much time tuning things that really
aren't a problem.
Cary Millsap talks about this often. Find the business problem and tune
that. It's possible that something that shows up as "very slow" when
you look at the overall system is actually something that runs rarely
and tuning it will give you no noticeable improvement.
If the log switches are happening that frequently, you might look into
resizing them. I'd first look at what is going on during office hours
that's causing them to fill so fast.
Rachel
- Denham Eva <EvaD_at_TFMC.co.za> wrote:
> Ouch! :)
>
> Rachel,
>
> It's not a case of me looking for problems. I was surprised to find
> this
> occuring so maybe doing something about it would improve the system
> alittle.
> I am looking into the redo log performance because I am unsure that
> the redo
> log switches are normal as they can be very high during office hrs as
> high
> as 60 switches in an hr, but having said that the switches avrg out
> at 3-4
> switches an hour. So all the obvious are to be looked into ie
> checkpoints
> etc.
>
> From your line of thought in the email below, I am reading into it
> that you
> don't find this to be an issue, which is great. I will then just
> carry on
> checking all the other possible parameters and stats, until I am
> happy that
> the redo logs are as healthy as they can be.
>
> In my defence I did try the to change the parameter on my test system
> first.
>
> Hope that explains my line of thought and modus operandi.
> Regards
> Denham
>
> -----Original Message-----
> Sent: Thursday, November 07, 2002 3:18 PM
> To: Multiple recipients of list ORACLE-L
>
>
> there is a point at which you begin to tune for the sake of tuning
> and
> not because you are relieving a problem.
>
> if you are not getting reports of performance problems, why are you
> trying to fix it? the old adage "if it ain't broke, don't fix it"
> applies here.
>
>
> --- Denham Eva <EvaD_at_TFMC.co.za> wrote:
> > Hello Guru's
> >
> > I have run a script which indicates that of the three redo log
> > latches two
> > had occurences of sleeps. To overcome this usually you increase
> > SPIN_COUNT
> > by 50% or so.
> > When trying to ALTER SYSTEM SET SPIN_COUNT = 3000;
> > Present system is set as 2000. I get the following error.
> > *
> > ERROR at line 1:
> > ORA-25138: SPIN_COUNT initialization parameter has been made
> obsolete
> >
> > Now what? what can I do to overcome the sleeps issues?
> >
> > Regards
> > Denham Eva
> > Oracle DBA
> > "UNIX is basically a simple operating system, but you have to be a
> > genius to
> > understand the simplicity."
> > Dennis Ritchie.
> >
> >
> >
>
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Received on Thu Nov 07 2002 - 09:08:41 CST
