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see ORA-12699
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RE: ora-12500 on windows

Koivu, Lisa

2004-02-18

Replies:
Hi Paul,=20

Thanks for your reply and for the link. I am not using
pga_aggregate_target any longer. It was a mess. Instead I am tweaking
down sort_area_size. It's at 1MB right now.=20

The bottom line is we have all this memory, the loads want to run
screaming parallel, and I need to find the right config to do so. =20

When sga_max_size is at or over 1800m, I get 12500's and failed
sessions. =20

When the loads run under choose, hash joins begin and ora-4030's start
happening. First_Rows takes care of this, but hashing is faster, and I
do have memory to support it. I just have to config it correctly.

Choose + big sga_max_size =3D Monkey Hunting.

When I bring sga_max_size down and set first_rows, everything seems
happy for the time being. However, it's going to change fast and I'll
have to pursue VLM.=20

If you read note 225349.1 it states, "What the PAE switch allows you to
do from the Oracle perspective is to increase the amount of memory that
can be used for the Oracle Database Block Buffer Cache. It is important
to note that this additional memory can ONLY be used by Oracle in the
form of an increased value for DB_BLOCK_BUFFERS." This makes me wonder
if it's even worth pursuing. My cache is only set around 50m or so. =20

Thoughts? I'll have to dig through the Microsoft link and links given
on that page in more detail when I don't have people breathing down my
neck. Hey, I may even learn something about Windows. =20

Thanks again, Paul
Lisa


-----Original Message-----
From: Paul Drake [mailto:discgolfdba@(protected)
Sent: Wednesday, February 18, 2004 2:39 PM
To: oracle-l@(protected)
Subject: RE: ora-12500 on windows

--- "Koivu, Lisa" <Lisa.Koivu@(protected):
> Hello Jeffrey,=3D20
>=20
> I'm feeling your pain, like you wouldn't believe.=3D20
>=20
> I think it's note 225349.1
>=20
> My problem that is resulting in ora-12500's is many,
> many connections
> being fired at one time. Informatica fires in the
> neighborhood of 300
> connections all at the same time, the exact same
> second. I have tried
> adding multiple listeners, adding the QUEUESIZE
> parameter, all to no
> avail. I had to reduce the sga size to stop the
> errors. =3D20
>=20
> To make this more interesting, I am guaranteed that
> in the future there
> will be several hundred more concurrent connections
> added to what I'm
> dealing with now. =3D20
>=20
> Can anyone comment - can MTS help in my situation?=20
> I've never used it.
>=20
>=20
> Any comments or suggestions are welcome.
>=20
> Lisa Monkey
> Orlando, FL, USA=3D20


Lisa,

we use shared servers in 9.2 on w2k adv svr for a very
specific usage condition: where a VPN only has certain
ports open.

recently, a client site rebuilt a citrix server, and
did not restore the old tnsnames.ora file.

as a result, instead of obtaining dedicated server
processes, 1/3rd of their sessions from their citrix
farm were accessing shared servers.

it was fatal (to the instance, not to me).

It will depend upon your environment, but parsing with
shared servers being used is not viable. If the code
is lightweight and does not parse, you have a chance.

shared servers use a longer code path, and critical
resources (such as the library_cache latch or
shared_pool latch) may experience greatly increased
contention.

as far as large memory support,=20
http://support.microsoft.com/default.aspx?scid=3Dkb;EN-US;283037
"Large Memory Support Is Available in Windows 2000 and
Windows Server 2003"

the addition of /3GB (possibly /PAE) in the boot.ini
should take care of it. you can verify that these were
read properly in the registry, under boot options.

win32 does not support the use of prespawned
connections. I have not mucked with connection
pooling.
are you using pga_aggregate_target?

hth.

Pd

> -----Original Message-----
> From: Jeffrey Beckstrom
> [mailto:JBECKSTROM@(protected)
> Sent: Wednesday, February 18, 2004 12:55 PM
> To: oracle-l@(protected)
> Subject: Re: ora-12500 on windows
>=20
> we are w2k AS. Do you know the metalink note for
> large memory support?
> >>> discgolfdba@(protected) >>>
> --- Jeffrey Beckstrom <JBECKSTROM@(protected):
> > mem usage
>=20
> familiar territory.
>=20
> on win32, the process memory limit is between 1.7
> and
> 1.8 GB of virtual memory. what version of operating
> system is the server running?
>=20
> if it is w2k server, you're stuck. you must reduce
> either the SGA or PGA memory allocations in order to
> stay under the process limit.
> if it is w2k advanced server, you can enable large
> memory support, and carry up to a 3*10E9 (convert to
> power of 2) memory allocated to a process.
>=20
> if is is w2k3 server, you can enable large memory
> support.
> certain versions of Oracle on win32 support large
> memory, and some don't.
> 9.2.0.4 does.
> 8.1.7.3 and 8.1.7.4 do not.
>=20
> to reduce memory allocations, you might:
> - check v$sgastat for free memory, and reduce the
> size
> of the shared, large and java pools.
> - reduce the buffer cache
> - reduce sort_area_size, hash_area_size
>=20
> hth.
>=20
> Pd
>=20
> > I would suspect they should be close to each other
> > since currently mem usage is 1.1 g and vm size is
> > 1.2 g.
> > >>> tanel.poder.003@(protected) >>>
> >=3D20
> > > oracle.exe process was 1.4 G per task manager -
> > well under the 2 G
> > > limit.
> >=3D20
> > I've seen problems starting happen when about 1,5G
> > of mem was allocated to
> > oracle.exe... From which task manager column did
> you
> > check the process size,
> > from "mem usage" or from "vm size"?
> >=3D20
> > Tanel.
> >=3D20
> >=3D20
> > > Swap space is set to max of 4 G
> > > commit charge peak is 2.4 G
> > > commit charge limit is 5.8 G
> > > We should be well under the limits
> > >
> > > Jeffrey Beckstrom
> > > Database Administrator
> > > Greater Cleveland Regional Transit Authority
> > > 1240 W. 6th Street
> > > Cleveland, Ohio 44113
> > >
> > >
> >=3D20
>=20
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