Problem in sizing sga

Dear All,
We are using Oracle 10g R2 on windows 2003.Our sga_max_size=2000m and sga_target=800m.We have enabled ASM.
I got an alert message in enterprize manger which says virtual memory paging is happening and its impact is 100%.
Now,Is this problem related to SGA?Do i have to resize my sga_max_size ?
We have 4gb RAM 460 gb hard disk what would be the ideal size for sga?
Regards,
Kris

For guidelines over SGA & memory, refer discussion here...
Re: windows 32bit sga and pga limits
But actual sizing of SGA depends on your application needs. If it needs more SGA, it does. You might need to add more RAM to your server to cope up with existing workload for a given number of users.

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Is properly sized sga?

hello all,
my database size is around 60gb, frequently iam getting performance problems, that job executing not in a time some times 4 hours some times 40 mins like that , when i look for sga and pga i thought parameters not tuned properly iam mentioning all sga & pga parameter here, can anyone tell what could be the best size we can put for every parameter?
to improve performance.
thanks in advance! its urgent.
SQL> show sga
Total System Global Area 629145600 bytes
Fixed Size 2067848 bytes
Variable Size 381682296 bytes
Database Buffers 243269632 bytes
Redo Buffers 2125824 bytes
SQL> show parameter pg
NAME TYPE VALUE
pga_aggregate_target big integer 115762790
SQL> show parameter sort
NAME TYPE VALUE
nls_sort string
sort_area_retained_size integer 0
sort_area_size integer 65536
SQL> show parameter hash
NAME TYPE VALUE
hash_area_size integer 131072
SQL>

SGA_SIZE SGA_SIZE_FACTOR ESTD_DB_TIME ESTD_DB_TIME_FACTOR ESTD_PHYSICAL_READS
552 1 618141 1 48146030
276 .5 1875872 3.0347 130687584
414 .75 697139 1.1278 52267330
1104 2 504218 .8157 39888986
828 1.5 504218 .8157 39888986
966 1.75 504218 .8157 39888986
690 1.25 511079 .8268 39888986

Problem with sizing

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Help on 10g 64 bit --Sizing SGA and sysctl.conf

Dear Sir,
I have an oracle10g installed on a 64 bit OS and want to allocate 8GB to SGA and want to confirm if i am using the right settings
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cat /etc/sysctl.conf
# Kernel sysctl configuration file for Red Hat Linux
# For binary values, 0 is disabled, 1 is enabled. See sysctl(8) and
# sysctl.conf(5) for more details.
# Controls IP packet forwarding
net.ipv4.ip_forward = 0
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Want to confirm is this a proper tuend settings as per memory provided ?
I am aware that it also depends on my appication behaviour , but i just want to check whether the above settings would suffice for a 16GB RAM machine and 64 bit oracle10g
Also let me know if any other setttings apart from this are required , i choose to use SGA Target .Further my application is read intensive . Your suggestions will be highly appreciated.
Thanx

Hi,
I suggest you to increase the value kernel.shmmax = 8589934592 of this parameter in sysctl.conf to kernel.shmmax = 1288490188
Later if you want to increase the size of SGA then you need to modify the kernel.shmmax = 8589934592 value. In general practice we keep kernel.shmmax value little greater then the value of SGA.
Refer MOS tech note:
*ORA-27102 Database Will Not Start With SHMMAX Set To 8589934592 (8GB) [ID 461519.1]*
*Linux Big SGA, Large Memory, VLM - White Paper [ID 260152.1]*
thanks,
X A H E E R
Edited by: ora_tech on Dec 26, 2010 10:14 AM

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quote:
Originally posted by:
Livelife92
Ok Guys-
So I have put up a trial of my flash website-
www.nicksdesign.com/flash
I'm new at flash- as this is the first project I've done in
flash, and the problem is...
I put the file in a simple HTML file in dreamweaver, and i
published the files, tested them on my computer, and it's great-
the size fits enough so that no scrolling is needed.
However-
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Are there any codes that can resize the swf file or the HTML,
based on screen resolution/browser [however- we tested in the same
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Any help would be SUPER appreciated
Best Regards,
Nick Smith

Sizing SGA

Hi All,
what is the standard method to resize sga, and what are all the things to be considered. Is there any formulat to do that.
Regards
Venu

There are couple of good notes in metalink. However, there is no any thumb rule for siging SGA. I would recommend you to start with a reasonable value and increase accordingly, if required. It alos depends on whether your db is OLTP or DSS.
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Thump rule for SGA sizing depends on TOTAL DB SIZE

Is there any thump rule for sizing SGA depends on TOTAL database size for OLTP system?

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Start your SGA with an optimal value, keep on eye on your performance, take statspack report and if further increase required in the SGA, go ahed.
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Problem with RAM 1GB and SGA

I have RedHat 6.1 and Oracle 8.0.5 on Dell with 2xPII and 1.5GB RAM, kernel 2.2.14. When I set in kernel option 2GB RAM, make it, I can set max 70MB shared memory pool in init.ora. With 1GB RAM in kernel, I can set 419MB shared memory pool (its max from standard shmparam.h).
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Kernel para and sga,pga sizing

Hello,
OS-HP-UX(configured to use high sga /no restrictions)
Current database is running without any issue
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Thanks

880991 wrote:
Ok some questions based on your reply:
1)then how any gain in upgrading memory above 4 GB if shmmax cannot be more then 4 GB (32 bit OS),then
SGA also cannot be > 4GB (As per documents SHMMAX should be > SGA)Because the SGA doesn't have to be in one segment. Which version of Oracle are you looking at? It makes a difference!
http://kevinclosson.wordpress.com/2009/07/27/little-things-doth-crabby-make-part-x-posts-about-linux-hugepages-makes-some-crabby-it-seems/
>
2)I read if Operating system is linux can use SGA above 4GB,in fact one of friend told they implemented SGA
4GB on linux configuring VLM/Huge pages,so in that case ( VLM ) needs to set SHMMAX > 4GB (as per memory ROT) of VLM take cares of SGA > 4GB even if SHMMAX is not setintrestingly my friend also mentioned that in there server VLM is set and shmmax is set < 4 GB and SGA > 4GB
still it works without problem when checking SGA usage in dyanamic views its shown as using above 4 GB
,it contradicts what i read in documents,how this is working ,anyone have idea?[url http://download.oracle.com/docs/cd/B28359_01/server.111/b32009/appi_vlm.htm]No contradiction.
Also VLM implementation is restricted to Linux or it can be on set on Unix as well and if its set do all components
of SGA benefit or only buffer cache?
ThanksIt varies, some unix are quite different than others. Specific answers can only be given to specific configurations. I really have to wonder when you are asking about hp-ux and 32 bit.

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Hi,
We have Oracle 10g database, which have the following parameters.
sga_max_size=1600m
shared_pool_size=704m
So planned to use SGA_TARGET and set the size to 2G.
(ie) sga_target=2G
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Regards,
Mahesh

Chinar wrote:
Aman.... wrote:
So I won't suggest that you remove the shared pool parameter completely. You may reduce the value given to it and start of from a smaller value rather than from the default one granule.
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Sometimes your application needs a minimum amount of specific pool as it's written in the documentation:
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Problem in sizing sga

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