Re: Problem with many (160 - 170) sessions in the database on NT

I'm going to retract part of this post, as it has been pointed out to me that 7.3 on NT normally consumes about 1.5 meg of RAM per session. This is of course dependent on SORT_AREA_SIZE.

I've obviously disremembered common memory usage stats for 7.3.x. That and a lot of my 7.3 experience in on a DW where the sessions used quite a bit more memory that 1.5 Meg.

Jared

On Tuesday 29 May 2001 12:10, Jared Still wrote:
> Jonas,
>
> In addition to Dick's comments about a real Os ( with which I concur ) you
> need to do that math. You are running 170 sessions on the database.
>
> You can count on each session eating up 5 meg of RAM with 7.3. If you
> go to 8i, you can at least double that figure. This is all dependant on
> your SORT_AREA_SIZE of course and YMMV.
>
> So your box is using 1 gig of RAM for user sessions. That leaves you
> with 700M, and we don't know how big your SGA is. I don't know how
> much RAM NT wants, maybe someone else can help out here.
>
> You need more RAM IMO, but I'm operating on assumptions here and
> not too many facts.
>
> You probably can't upgrade to 8.1.7 with your current RAM. I would wonder
> about 4 processors for 170 users as well.
>
> And of course, there's the 1.7 Gig mem bug you mention, afraid I don't know
> anything about that.
>
> Bottom line, this box seems to be pushing it's resources, but you're in a
> better position to make that call.
>
> Jared
>
> On Tuesday 29 May 2001 09:50, Jonas A Wetterberg wrote:
> > Hello
> >
> > We are running into a little problem with an Oracle installation. The
> > server OS is Windows NT, SP6, and the version of Oracle is 7.3.4.5.0. The
> > server have 4 processes, we have about 1,7 G primary memory and about 2 G
> > of memory on swap disk. We have 4 processes in the machine. One of these
> > is reserved for the OS, and Oracle uses the other 3.
> >
> > We we reach around 170 sessions in the database, the database sometimes
> > goes down and we have to perform a restart. The 3 process Oracle use are
> > all at about 100% in task manager. The memory use is somewhere around 1,3
> > G. Then we can run the database for aboout 4 more hours, then we have to
> > restart. Sometimes we have to restart around lunch everyday.
> >
> > Now I have heard the Windows NT have a limit of how much memory one
> > process might use, and that limit is somewhere around 1,7 G, and that
> > that might be our problem.
> >
> > We are planing to upgrade to Oracle 8.1.7 and to Windows NT 4 Enterprise
> > Edition or to Windows 2000 Advanced Server. Does anyone know if this can
> > help? Should we put more memory or more processes in the machine?
> >
> > Any help is appreacheated
> >
> > Regards
> >
> > /Jonas

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Author: Jared Still
  INET: jkstill_at_cybcon.com

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