Comments on: AWE -What is It and How to use it?

By: Crysu

Crysu — Sat, 25 Feb 2012 18:53:01 +0000

Hello,

Is I have USE_INDIRECT_DATA_BUFFERS set to true in my pfile. Until now tried also increasing and decresing AWE without success.

Thanks for your fast replay.

By: Amit

Amit — Sat, 25 Feb 2012 10:35:51 +0000

Crysu,

It could be related to virtual machine but I am not sure on that. Have you set USE_INDIRECT_DATA_BUFFERS=TRUE in spfile/pfile?

You can try reducing some parameters and see if it starts. Also consider increasing AWE_WINDOW_SIZE

-Amit

By: Crysu

Crysu — Fri, 24 Feb 2012 19:24:07 +0000

Hi,

The errors are related to OS Memory:
O/S: out of memory

Using those calculation I should be fine with all those parameters if AWE is working… but I suspect that AWE is not working.

I forgot to mention that I’m using a virtual… but in any case I didn’t found any doc saying something about virtual machines.

Regards

By: Amit

Amit — Fri, 24 Feb 2012 13:06:01 +0000

Crysu,

Can you let me know the errors which you are getting while starting db.

-Amit

By: Crysu

Crysu — Wed, 22 Feb 2012 20:51:57 +0000

Hi Amit,

First congrats for this post. I’m not very familliar with those 3G/PAE/AWE. It will be nice if you can help with the following problem: OS: Windows Server 2003 R2 EE, Oracle 11.2.0.1, 8GB RAM, 4CPU.
If I set in the ora.ini the following parameters database will not start:
AWE_WINDOW_MEMORY=346030080 (this is set in registry under oracle home)
DB_BLOCK_BUFFERS=558080
PGA_AGGREGATE_TARGET=176883763
SHARED_POOL_SIZE=442652059
SGA_TARGET or MEMORY_TARGET not set
DB_CACHE_SIZE not set
PAE and 3GB set in boot.ini

Could you please help correcting those parameter ?

P.S. If I set sga_max_size=2500M and pga_aggregate_target=760M without using all those parameters database will start but on heavy load will crash.

Best Regards

By: Amit

Amit — Wed, 10 Aug 2011 05:27:13 +0000

As mentioned in article , you can’t use SGA_TARGET

**Please Note that you can not use ASMM i.e SGA_TARGET when using AWE.**

-Amit

By: Bhupendra

Bhupendra — Tue, 09 Aug 2011 09:21:52 +0000

Hi,
I am using Oracle Database 10g Enterprise Edition Release 10.2.0.1.0(32 bit)with windows server 2003 Enterprise Edition(64 bit) with 8GB physical memory. Below are the initialization parameter in spfile for memory:-
sga_max_size – 3GB
sga_target -2704MB
pga_aggregate_target -1572MB

Still i am facing ORA-04030- out of process memory error during daily opeations.
Please help me or suggest me how to resolve this issue.

Regards
Bhupendra

By: tongkimongki

tongkimongki — Tue, 26 Oct 2010 08:57:05 +0000

Hi…
iam having difficulties in tuning memory for oracle.
Right now, i have the following setting :

sga_max_size = sga_target = 584M
pga_aggregat_target = 300M
shared_pool_size = 0
db_cached_size = 0

I am using Oracle 10.2.0.1.0 with Win Server 2003 Enterprise x32 with 10Gb RAM. ASMM is enabled. I use /3GB and /PAE in boot.ini.

I want to increase the memory more than 2GB but it seems limited. In “Database Configuration Assistant: Step 10″ (when you create new database using wizards) , oracle can read only 2GB of RAM.
I can’t set “use_indirect_data_buffers” to TRUE as it will stop oracle instance (it will throw error ora-12514) and therefore i cant use AWE_WINDOW_SIZE.
If i get my AWE working, is it better using ASMM ?

Can you please give me suggestion. I want to enable AWE… Thanks.

-tongkimongki @ yahoo . com-

By: Hank

Hank — Thu, 23 Sep 2010 15:12:00 +0000

PAE allows the system to expand the number of bits that can be used to address physical memory from 32 bits to 36 bits. Out of 1.7GB allocated to Oracle, 1 GB is allocated to a “WINDOW” which is used to map the buffer cache and allows for bigger SGA. This acts like a “Swap Area” where all the blocks are mapped into this window and then provided to the application.It is advisable to use /3GB switch along with /PAE switch so that addressable space is around 2.7GB.

By: Hank

Hank — Thu, 23 Sep 2010 15:03:25 +0000

“< 2,7 GB" seems from Oracle Notes. for Linux, this value can go up a little bit.

By: Amit

Amit — Wed, 22 Sep 2010 11:42:43 +0000

Mathias,

What was initial setting for large_pool. RMAN and parallel query slaves use large pool. So would recommend increasing large_pool to 200 or more (depending on your earlier setting).

Cheers
Amit

By: Mathias

Mathias — Tue, 21 Sep 2010 15:20:52 +0000

Hi Amit! This article is very usefull. We are using oracle 10.2.0.1 on win 2003 ent, with 6gb. We already tried to use awe with 1 Gb in the registry, and shared_pool_size=1024M
db_block_buffers=368640
db_block_size=8
java_pool=200M
large_pool=120M.
pga_aggregate_target=300G

The instance started up without error , but after a few hours of using it, with 30 users, it started to give errors like:
ora-4031 unable to allocate shared…..(‘large pool’), and RMAN was reporting trouble also.

No sga_ parameters are used, Thank you in advance.

By: Amit

Amit — Fri, 25 Jun 2010 03:57:36 +0000

Jargo,

Can you please unset SGA_MAX_SIZE parameter and try again.

Regards
Amit

By: Jargo

Jargo — Thu, 24 Jun 2010 15:50:04 +0000

Hi Amit, your article was really a great help!! Though we are still trying to get some good working settings.
Our RMAN backup still fails whatever we try..
Maybe you have got some ideas:

Oracle 9.2i
CPU’s = 8
Total ram = 16GB

AWE is set at 536 870 192

DB_BLOCK_BUFFERS = 384216
sga_max_size = 1500M
shared_pool_size = 500M
PGA_AGGREGATE_TARGET = 700M

/3GB and /PAE are set in boot.ini.

We have tried several configs with all different sizes for SGA, PGA, block_buffers etc. but still we get:

MAN-03002: failure of backup command at 06/24/2010 14:26:10

ORA-04030: out of process memory when trying to allocate 1049100 bytes (pga heap,KSFQ Buffers)

with our RMAN..
Do you have any suggestions to get RMAN working again? Must be something with PGA i would suspect!

Thanks!!!
regards,
Jargo

By: Amit

Amit — Sun, 28 Mar 2010 09:13:47 +0000

MOS means My Oracle Support or metalink

Cheers
Amit

By: Saleem

Saleem — Sun, 28 Mar 2010 08:19:20 +0000

What MOS mean ?

By: Amit

Amit — Tue, 23 Mar 2010 14:51:57 +0000

Hi Saleem,

In your case you are getting ora-4030 error i.e process memory (PGA) +SGA has gone beyond 2.7 gb . I think you will have to look at two options

a) Try looking at why the pga requirement is high. May be you can tune the sql and try for optimal plan

b) Reduce sga size and see if you are still getting errors.

You can try using /PAE switch but i think you will have to change AWE_WINDOW_SIZE too. Refer to MOS note on finding appropriate size.

Regards
Amir

By: Saleem

Saleem — Sat, 20 Mar 2010 06:46:35 +0000

Hi Amit,

I found you post realy helpful.

I need your advise to set these parameters for my database also: Below is the details:

Database version = 10.2.0.2
Oracle Applications Version= 12.0.6

OS= Windows Server 2003 Enterprise Edition Service Pack 2

Boot.ini
———–
[boot loader]
timeout=30
default=multi(0)disk(0)rdisk(0)partition(2)\WINDOWS
[operating systems]
multi(0)disk(0)rdisk(0)partition(2)\WINDOWS=”Windows Server 2003, Enterprise” /noexecute=optout /fastdetect /pae /3gb /userva=3030
————————————————-
Total Physical Memory = 16 GB
————————————————-
Total System Global Area 2147483648 bytes
Fixed Size 1293536 bytes
Variable Size 872416032 bytes
Database Buffers 1258291200 bytes
Redo Buffers 15482880 bytes
—————————————————————————
db_block_buffers integer 0
db_block_size integer 8192
db_cache_size big integer 0
java_pool_size big integer 0
large_pool_size big integer 0
log_buffer integer 15244288
sga_max_size big integer 2G
sga_target big integer 2G
shared_pool_size big integer 800M
streams_pool_size big integer 0
—————————————————————————
use_indirect_data_buffers boolean FALSE
—————————————————————————
sessions integer 1600
processes integer 800
—————————————————————————

Please advise what step should I follow to utilize memory more than 4 GB?

As we are facing the following issue:
An internal error has occurred in the program XLA_AE_LINES_PKG.SetNullLine. ORA-06500: PL/SQL: storage error
ORA-04030: out of process memory when trying to allocate 16396 bytes (koh-kghu sessi,pmucalm coll).
An internal error occurred. Please inform your system administrator or support representative that:

Waiting for your reply

Thanks
Saleem

By: Amit

Amit — Sat, 06 Feb 2010 09:31:44 +0000

Vinod,

As a thumb rule, set SGA_TARGET to 256mb * Number of CPU’s i.e 1024 M in your environment.
Can also set shared_pool_size to 256M so that you do not see reloads/invalidations. May be before touching these values, you can look at hard parses or reloads/invalidations in V$librarycache or your statspack/awr reports.

Regards
Amit

By: Vinod Sharma

Vinod Sharma — Fri, 05 Feb 2010 08:31:37 +0000

HI Amit,

Thanks for your response. I just wanted you to check the variables defined like sga etc. If this is OK then I will certainly log an SR for resolution.

Regards
Vinod