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out of process memory when trying to allocate string bytes
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TNS:packet writer failure
see ORA-12699
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RE: SGA/PGA question

oracle l bounce

2006-08-25

Replies:
What are the commands to check the memory usage by each process on sun
box, since sga is 600gb and pga 200gb and still we are seeing 0 free ram
left so there must be other processes to check before I can change and
of this parameters. I completely agree that we need bigger machine but
still I need to solve this issue for 2-3 weeks.

Regards
--Harvinder

-----Original Message-----
From: Bobak, Mark [mailto:Mark.Bobak@(protected)]
Sent: Friday, August 25, 2006 4:40 PM
To: Harvinder Singh; ORACLE-L
Subject: RE: SGA/PGA question

Hi Harvinder,

First off, there is no pga_target parameter. I'll assume you're
referring to pga_aggregate_target. With it set to 200MB and expecting
900 dedicated server processes connecting concurrently, that's about
233017 bytes per server process for pga memory. That's WAY too small.

Assuming that you have 2GB RAM, and you're ok w/ the 600MB you've
allocated to sga_target, well, perhaps you could try bumping
pga_aggregate_target to 900MB. But, even there, you're only at 1MB per
server process. Unless you have VERY MODEST memory usage requirements,
that's not going to be enough.

You need a box with more memory. Shared server (aka MTS) is not a
panacea.

Also, are you using raw devices? If you're on cooked filesystems, are
you using direct I/O? If not, the OS will use memory to cache your
datafiles in the filesystem layer, and consume memory there too.

Bottom line, you need more memory....

-Mark

--
Mark J. Bobak
Senior Oracle Architect
ProQuest Information & Learning

Ours is the age that is proud of machines that can think and suspicious
of men who try to. --H. Mumford Jones, 1892-1980


-----Original Message-----
From: oracle-l-bounce@(protected)
[mailto:oracle-l-bounce@(protected)
Sent: Friday, August 25, 2006 4:24 PM
To: ORACLE-L
Subject: SGA/PGA question

Hi,

We have 10.1.0.3 installed on sun solaris 10 having 2GB RAM and 2GB swap
file. In our system 4-5 application starts at same time and each
requires about 180 connections to the database. So about 900~ processes
can be connected at the same time and we have set the following
parameters:
Processes = 1000
Pga_target = 200MB
SGA_TARGET = 600MB

We are using the dedicated server model and getting following error
frequently and also notice that physical RAM drops to 0 MB free:
Ora-12500 (unable to start the dedicated process)

Since this is just a development box, so to fix this issue we are
planning to move to MTS model.

Is there any other way to solve this issue, if we have to go to the MTS
model what should be the value of PGA and SGA to be set?

Thanks
--Harvinder

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