Thanks a lot for your time.

"Joel Garry" <joel-garry@home.com> a écrit dans le message de
news:91884734.0310311515.53b884d2@posting.google.c om...
> "Sean Chang" <sean@cnfei.com> wrote in message
news:<3fa2908e_3@corp.newsgroups.com>...
> > Comments inline.
> >
> > > I just bought a new sun server (280R) and I plan to run solaris 9 on
it in
> > > 64 bits mode,
> > > which I think is the default when you install (Can anyone confirm this
?)
> >
> > Yes, 64-bit is the default. You should never change to 32 bit OS
> >
> >
> >
> > >
> > > Should I run oracle 64 bits edition on it, or would oracle 32 bits
edition
> > > run just fine ?
> >
> > We run an Oracle DB of 32 bits in 64-bits Solaris (8 ,9) for more
> > than 2 years now. Performace is good, also very stable.
> >
> >
> > > I heard that the 64 bit edition was slower and I don't need a HUGE
SGA,
> > and
> > > I will probably
> > > have older 32 bit oracle OCI apps running that I cannot recompile.
>
> Oooh, scary Halloween! :-O
>
> They are supposed to work, but those shared libraries... you just
> never know until you try. Hopefully it will only be an issue when
> recompiling.
>
> > >
> > > Is there a HUGE performance penalty in running 32 bits apps on solaris
64
> > > bits ?>
> > Don't know that becuase I have no comparisons.
>
> http://www.sun.com/sun-on-net/itworl...51101perf.html
>
> Metalink Note:107201.1 says "32-bit databases run on systems with a
> small number of 32-bit CPUs (4-6) may see some degradation in
> performance if moved to 64-bit systems also with a small number of
> 64-bit CPUs.
>
> Applications will achieve the benefits of improved scalability on-64
> bit machine only if they are memory intensive. 64-bit applications
> have bigger data structures because memory has to be addressed with a
> larger number of bits. Larger data structures translate into
> addtional memory requirements per process.
> ...
>
> When running 32-bit Oracle binaries on a 64-bit machine, you will have
> to set SHMMAX to 1GB exactly. This is an important requirement when
> you want to extend the SGA beyond the 1GB. "
>
> Note that you can have a huge SGA with 64-bit, if you can afford the
> physical memory and checkpointing penalties. The general idea is that
> not having to go to disk is an advantage over the penalties. For the
> same init.ora configuration, 64 bits will need more physical memory.
>
>
http://metalink.oracle.com/metalink/..._id= 209766.1
>
> Watch the Oracle certification matrix for bit availability when
> upgrading.
>
>
http://metalink.oracle.com/metalink/...p_id= 62290.1
>
> My general bias is spring for the physical memory and run 64 bit,
> since most businesses eventually want to calculate things. And don't
> run unsupported software that has no ability to recompile/reinstall.
>
> jg
> --
> @home.com is bogus.
> http://www.infoworld.com/article/03/...sgoogle_1.html