ora-4030 pga memory allocation running wild

From: Jeroen van Sluisdam <jeroen.van.sluisdam_at_vrijuit.nl>
Date: Tue, 23 Dec 2003 07:24:25 -0800
Message-ID: <F001.005DAE74.20031223072425@fatcity.com>

Content-Type: text/plain

Hi,

I have an ora-4030 problem related to pga memory allocation, at least I have concluded sofar
This program is batch written in pl/sql and after an hour or so it crashes. PGA allocated is slowly exceeding
2Gb and when I monitor with top I see the process size rising uptill 2 Gb somewhere.
Last week we migrated from on oracle 7 environment where this program ran smoothly for years.
At the same time we migrated the OS also and started with new machines. The ux kernel parameter
for max data segment size is 2Gb.

I had an oracle consultant here for migration and he advised to put pga_aggegrate_target on 250M. Box has
4Gb, shared_pool_size is 250Mb, SGA is almost 800Mb

I issued a tar and Oracle advised me to remove pga_aggegrate_target from the init_file, but because this is production I cannot restart that easily (online changes are allowed ony from min. value 10M) I also tested this program with event : alter session set events '4030 trace name errorstack level 3'; I found the so called SQL-statement that might be causing this but explaining this plan gave me an even better plan than on the oracle 7 environment Oracle support still has to get back to me with latest things.

This program is clearly running wild on memory. Based on the docs on metalink I lowered the pga_aggegrate_target to 160M now and I'm testing this right now. Is there any way to protect your system from memory consumption like this case. Are there any other parameters to consider?

Details: oracle 9.2.0.4 HPUX 11.11, 4Gb phys memory

Thanks in advance,

Jeroen

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Hi<fon= t size=3D2
face=3DArial>,<o:p></o:p><= /p>

<o:p> </o:p>

I have an ora-4030 = problem
related to pga = memory
allocation, at least I have concluded sofar<o:p></o:p>

This program is = batch written
in pl/sql and after an hour or so it = crashes. PGA allocated is slowly = exceeding<o:p></o:p>

2Gb and when I  =
monitor with

top I see the process size rising uptill 2 =
<span

class=3DSpellE>Gb somewhere.<o:p></o:p>

Last week we = migrated from on
oracle 7 environment where this program ran smoothly for = years.<o:p></o:p>

At the same time we =
<span

class=3DGramE>migrated the OS also and started with new = machines. The ux kernel parameter<o:p></o:p>

for</sp= an> max data segment size = is 2Gb.<o:p></o:p>

<o:p> </o:p></sp= an>

I had an oracle = consultant
here for migration and he advised to put pga_aggegrate_target on 250M. Box has<o:p></o:p>

4Gb</sp= an>, shared_pool_size
is 250Mb, SGA is almost = 800Mb<o:p></o:p>

<o:p> </o:p></sp= an>

I issued a tar and = Oracle
advised me to remove pga_aggegrate_target = from the init_file, but because this is production I = cannot restart
that<o:p></o:p>

easily<= /span> (online changes are = allowed ony from min. value 10M) <o:p></o:p>

I  also tested this program = with event :<o:p></o:p>

alter</= span> session set events = '4030 trace name
errorstack level 3'; I found the so called
SQL-statement that might be causing this<o:p></o:p>

but</sp= an> explaining this plan = gave me
an  even better plan than = on the
oracle 7 environment Oracle support still has to get back to me with =
<o:p></o:p>

latest<= /span> = things.<o:p></o:p>

<o:p> </o:p></sp= an>

This program is = clearly
running wild on memory. Based on the docs on metalink
I lowered the pga_aggegrate_target to = 160M<o:p></o:p>

now</sp= an> and I'm testing this = right
now. Is there any way to protect your system from memory consumption = like this case. Are there any<o:p></o:p>

other</= span> parameters to = consider?<o:p></o:p>

<o:p> </o:p></sp= an>

Details: oracle = 9.2.0.4 HPUX 11.11, 4Gb phys = memory<o:p></o:p>

<o:p> </o:p></sp= an>

Thanks in = advance,<o:p></o:p>

<o:p> </o:p></sp= an>

Jeroen<o:p></o:p></sp= an>

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Author: Jeroen van Sluisdam
  INET: jeroen.van.sluisdam_at_vrijuit.nl

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Received on Tue Dec 23 2003 - 09:24:25 CST