Oracle parameters related kernel parameters

Hi,
Can anyone tell me hwo can i get the info about the oracle parameters which are related to os, for example- i am getting a request to change the process parameter for the db instance which are the kernel parameters need to be changed..
so we have to relate the kernel parameters with database parameters. like this, can i get anywhere for oracle parameters which are associated with kernel parameters. Please let me know if anyone has this information.
Thank u.

990991 wrote:
Hey.. i want to know which oracle parameter is associated with kernel parameters ..
something like this shmmax === related SGA (which exact oracle parameter of SGA need to be changed at database level) similarly for process parameter which parameter is related at os level (in kernel parameters)
I think my question is clear now.. to get the appropriate help.
Thank U..
Did you consider that it is not a one-for-one relationship?
The installation guide is very explicit about how to set the kernel parameters.
Most importantly, what error triggered this request? We often see people chasing the wrong solution for their unstated problems.

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Hi;
For those setting mention in installation guide which is already shared previous post.
I suggest also see:
Oracle Database on Unix AIX,HP-UX,Linux,Mac OS X,Solaris,Tru64 Unix Operating Systems Installation and Configuration Requirements Quick Reference (8.0.5 to 11.2) [ID 169706.1]
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Checking Linux Kernel Parameters before installation

Hi Everyone.
I am planning to install Oracle 10g XE and I know that with the installation kernel parameters will change. As I don`t know what will happen that in relation to the system, I would like to check default kernel parameters. I know it`s a Linux question but it`s indirectly related with the installation. So... I want to save that information if something goes wrong.
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Hi.
Thanks for the clue.
I did:
less /etc/sysctl.conf
and the output is:
# 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
# Controls source route verification
net.ipv4.conf.default.rp_filter = 1
# Do not accept source routing
net.ipv4.conf.default.accept_source_route = 0
# Controls the System Request debugging functionality of the kernel
kernel.sysrq = 0
# Controls whether core dumps will append the PID to the core filename.
# Useful for debugging multi-threaded applications.
kernel.core_uses_pid = 1
# Controls the use of TCP syncookies
net.ipv4.tcp_syncookies = 1
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Setting IPCS kernel parameters in Solaris 9

I'm trying to install Oracle 9i on Solaris 9 but it fails during the database instance startup phase of the installation. The error message that I get relates to a failure in shmget. I read the Oracle docs and other docs and this is how I set the parameters in /etc/system:
set semsys:semmni=100
set semsys:semmns=1024
set semsys:semmsl=256
set shmsys:shmmax=4294967295
set shmsys:shmmin=1
set shmsys:shmmni=100
set shmsys:shmseg=10
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Thanks in advance.

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IOMMU explanation of kernel parameters

Hello!
I've set up an HTPC with an AMD A4-5300 CPU, A75 (Hudson-D3) chipset and a PCIe sound card (Asus Xonar DX). Whenever I tried to get a sound out of it (e.g. aplay blubb.wav) I only got dozens of these messages in the kernel log:
[ 46.215678] AMD-Vi: Event logged [IO_PAGE_FAULT device=02:00.0 domain=0x0000 address=0x0000000000100000 flags=0x0050]
The messages appeared only on the first aplay command. When the program finished and I ran it again, I got no additional messages but sadly also no sound.
Spending two evenings on this problem with google I found out it might be some trouble with IOMMU features of the processor or mainboard. So after trying out several of the options, I found iommu=soft in the kernel parameters got the sound to work fine. I have the possible options from here: https://www.kernel.org/doc/Documentatio … ptions.txt
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Thanks for the detailed explanation!
But isn't the GART something Video Card related? Or is it that what you mean with "abusing" the GART?
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3. <arch/x86_64/kernel/pci-swiotlb.c> : Software IOMMU implementation. Used
e.g. if there is no hardware IOMMU in the system and it is need because
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Kernel Parameters on Red Hat Linux

The installation instructions require us to set cetain kernel
parameters, such as SHMMAX, SHMSEG, SEMMNS, and so on.
Does anyone know how this is done for Red Hat Linux? I have
been hunting around the documentation and public domain web-
sites for a couple of weeks now and I haven't found any
reference to how to set these parameters.
Eternally grateful for any insights...
Cheers!
Stuart Housden
null

I had problems with 8i and 32Meg of SHMMAX (sometimes, when I
published an EJB, Oracle crashed). I didn't recompiled the
kernel, only did
echo 134217728 > /proc/sys/kernel/shmmax.
This limited the maximum shared memory to 128Meg (I installed
with JavaVM enabled), and I my problems got away.
Robson.
Anwar (guest) wrote:
: Stuart Housden (guest) wrote:
: : The installation instructions require us to set cetain kernel
: : parameters, such as SHMMAX, SHMSEG, SEMMNS, and so on.
: : Does anyone know how this is done for Red Hat Linux? I have
: : been hunting around the documentation and public domain web-
: : sites for a couple of weeks now and I haven't found any
: : reference to how to set these parameters.
: : Eternally grateful for any insights...
: : Cheers!
: : Stuart Housden
: This question was replied to multiple times on the list before,
: but here goes. Check out:
: http://jordan.fortwayne.com/oracle
: Basically, you have to edit the kernel header files, and
: recompile the kernel. Read the Kernel-HOWTO too.
: Anwar.
null

Reg: Kernel Parameters White paper

Hi Gurus,
Can any one tell me the importance of kernel parameters with respect to oracle database installation.
Thanks & Regards
Azim

There is some Oracle specific info at [Solaris Internals and Performance FAQ|http://www.solarisinternals.com/wiki/index.php/Solaris_Internals_and_Performance_FAQ]
Are you looking to solve a problem(s) or just avoid them?
have a good day,
Glen

Where are the Linux kernel parameters?

I have successfully installed ORACLE on red hat linux 5.0
even though I didn't set the kernel parameters.
On Solaris these parameters can be set in the /etc/system file.
Where do you set SHMMAX and the kernel parameters in linux?
I could not find a similar file.
Please enlighten me.
Thank You
Be careful with environment variables!
run the root.sh script after installation!
null

Frank Westheider (guest) wrote:
: Mark Lee (guest) wrote:
: : I have successfully installed ORACLE on red hat linux 5.0
: : even though I didn't set the kernel parameters.
: : On Solaris these parameters can be set in the /etc/system
file.
: : Where do you set SHMMAX and the kernel parameters in linux?
: : I could not find a similar file.
: : Please enlighten me.
: : Thank You
: : Be careful with environment variables!
: : run the root.sh script after installation!
: Hi Mark.
: You have to install the Kernel-Sources and Include-Files.
: Just look in
: /usr/include/asm/*shm*.h
: and change the parameters. After this re-create the kernel with
: cd /usr/src/linux
: make clean && make dep && make && make modules && make
: modules_install
: and install the kernel-file (lilo/bootlin....).
: Ciao
: Frank Westheider
You might want to follow this thread (it's on the previous page
of threads):
Kernel Parameters?
From: Bolen Coogler (guest)
Email: [email protected]
Date: Mon Oct 26 16:00 CST 1998
The Oracle install instructions mention setting various kernel
parameters, such as:
SHMMAX 4294967296 (0x100000000)
SHMMIN 1
SHMMNI 100
SHMSEG 10
SEMMNS 200
SEMMNI 70
SEMMSL
While setting these parameters is VERY important in HP/UX or
Solaris, I haven't the slightest idea if this is really applies
to Linux. Does anyone know if tweaking these and other kernel
parameters matters in Linux? If so, where do you make these kind
of changes? (/usr/src/linux/include/linux/<something>.h ?)
My initial impression is the Oracle on Linux documentation is
converted Solaris boilerplate (i.e. %s/Solaris/Linux/g).
null

Increasing kernel parameters Solaris

Hi,
actually i have these parameters and i need to increase them. Which will be the next values to be entered for those ones. Im using solaris 10 , oracle 10gR2.04.
set shmsys:shminfo_shmmax=4294967295
set shmsys:shminfo_shmmni=2500
set semsys:seminfo_semmsl=1000
set shmsys:shminfo_shmmin=1
set shmsys:shminfo_shmseg=10
set semsys:seminfo_semmns=2500
Thx

Hi here i have answer for your query
if you want to set kernel parameters on solaris means
open the system file as vi /etc/system
and type the following at the end of file
set shmsys:shminfo_shmmax=4294967295
set shmsys:shminfo_shmmni=2500
set semsys:seminfo_semmsl=1000
set shmsys:shminfo_shmmin=1
set shmsys:shminfo_shmseg=10
set semsys:seminfo_semmns=2500
save and exit
reboot your system
now your kernel parameters changed
okkkkkk

Configure Kernel Parameters on Solaris10 for oracle10g

Hi all:
Before install oracle,we need configure Kernel Parameters in /etc/systme,such as shmsys:shminfo_shmmax,but accroding solaris document:Solaris Tunable Parameters Reference Manual,they have removed some parameters used by oracle,such as semsys:seminfo_semvmx.I'm confused by that manual,if i still change this params,the ORA-03113 error will appear when i create database.Can anyone help me about this?Thank you for Your attations!

Hi,
Try out this thread
Re: Installing OCS 10g R1 on Solaris 10
Bye

Y setting kernel parameters in linux and not in windows

Hi Can any one please help me out...
While installing oracle on linux we are setting some kernel parameters But when installing in windows are we setting any kernel parameters...We are not setting any parameters...can any one please explain why r we setting kernel parameters and what is the use of those parameters and why are we not setting any parameters in windows.

probably because linux != windows
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Kernell parameters of Java stack

Hi,
I´ve installed an abap and java stacks. In the post-installation guide, explains that we should change some kernell parameters (146289 and 835474), but this steps I´ve done in the abap stack but in the java stack i don´t know how to check the parameters.
How can i do this?
Or in the kernell config of java stack is the step JVM Settings?
More thanks

Hi,
With the Java system you don't have to worry about kernel parameters, the jvm parameters are important though and note 723909 is valid for your system as mentioned earlier. These parameters get set at installation, its worth just double checking them via the configtool (particulary the memory parameters). Note 723909 covers sun/oracle and HP-UX jvms, if you use an IBM jdk note 1024539 has the recommended parameters.
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Kernel parameters problem (512 mb RAM)

Hi,
I've installed Oracle on RedHat 5.2 (2.0.36) on a machine with
512 mb memory.
First I've recompiled the kernel how Oracle says and basing in
some documents (like
http://jordan.fortwayne.com/oracle/oralinux.html). Of course I've
saved a copy of the old kernel. The linux was ok, the command
ipcs -l shows the new values of the kernel parameters, but Oracle
didn't start. I've restored the copy of the kernel, the ipcs -l
shows the old values and now Oracle is running, with a SGA of
almost 300 mb.
Is there some problem in that? Will the machine loose performance
because the miminum values of the kernel parameters?
Best regards,
Ari
null

Ari Arantes (guest) wrote:
: Hi,
: I've installed Oracle on RedHat 5.2 (2.0.36) on a machine with
: 512 mb memory.
: First I've recompiled the kernel how Oracle says and basing in
: some documents (like
: http://jordan.fortwayne.com/oracle/oralinux.html). Of course
I've
: saved a copy of the old kernel. The linux was ok, the command
: ipcs -l shows the new values of the kernel parameters, but
Oracle
: didn't start. I've restored the copy of the kernel, the ipcs -
l
: shows the old values and now Oracle is running, with a SGA of
: almost 300 mb.
: Is there some problem in that? Will the machine loose
performance
: because the miminum values of the kernel parameters?
: Best regards,
: Ari
I have a setup similar to yours (384 MB instead of 512 MB),
and I spent some time looking at the parameters.
You CANNOT use the value for SHMMAX from the Oracle manual!
As it says at http://jordan.fortwayne.com/oracle/oralinux.html
"Should you decided to change these parameters, if you set
the SHMMAX to what Oracle says, you are telling the system
to allow a shared memory segment to grow as large as 4 Gigs.
Many users have reported problems setting the value this
high."
Sounds like you are another one of those users, eh?
If you read on down, the guy who wrote that web page never
used over 128 MB for SHMMAX. I'd take a strong hint from that.
=====
Oracle wants you to use 4GB-1 as the SHMMAX value. That
equates to (1<<32)-1. As we shall see, that is not allowed
without "breaking the rules" for the i386 architecture.
If you carefully read through the header file, you will find
out that the **actual maximum value** for SHMMAX is 256 MB.
You can tell this two ways. Take a look at the file at:
/usr/src/linux/include/asm/shmparam.h
Near the top of the file is:
/* address range for shared memory attaches if
no address passed to shmat() */
#define SHM_RANGE_START 0x50000000
#define SHM_RANGE_END 0x60000000
Note that the above is 256 MB (0x10000000), or (1<<28). This
is one potential source of trouble. I don't know if some other
files someplace else in the kernel specify uses for address
ranges adjacent to the above range, which I take to be the
"practical maximum" without redefining that range. Personally,
I wouldn't want to mess with the above unless I **really**
knew what I was doing (and I'll be the first to admit I don't).
=====
Farther down you will see some more lines (not together)
that look like this:
#define SHMID_BITS 7
#define SHMIDX_BITS 15
* SHMID_BITS + SHMIDX_BITS must be <= 24 on the i386 and
* SHMMAX <= (PAGE_SIZE << SHMIDX_BITS).
#define SHMMAX 0x2000000 /* max shared seg
size (bytes) */
Now, 7 + 15 is 22, so you could go up a couple of bits if you
had to. To avoid making the table any larger, I would suggest:
#define SHMIDX_BITS 17
But, 17 turns out to produce a result larger than the "practical
maximum" (256 MB) above. To see why takes a little more
explaining.
And if you don't change this at all, then the maximum possible
value for SHMMAX is 4096 [the PAGE_SIZE) << 15 [_SHM_IDX_BITS],
or rather (1<<27).
Now, that is exactly half of the (1<<28) "practical maximum" I
mentioned above.
So, if you always want the maximum amount of shared memory,
then change the definition of SHMMAX to the following:
#define SHMMAX (PAGE_SIZE<<_SHM_IDX_BITS) /* max shared seg
size (bytes) */
That gives you 128 MB in and of itself (as compared with 32 MB
as Red Hat 5.2 is delivered).
If you want the full 256 MB that is allowed for in the memory
map, then you need to also change:
#define SHMIDX_BITS 16
The above value is **exactly** what is recommended on the web
page you were following (above).
If you want to keep going up, you will need to change the
memory space allocated for shared memory as defined by
SHM_RANGE_START and SHM_RANGE_END, something I advise against.
=====
Even on a machine with 512 MB of "real" memory, I find it hard
to believe that there would be any substantial benefit to
having a maximum shared memory space greater than 256 MB. The
reason is that Oracle can use multiple shared memory spaces.
It requires a minimum of ten (10), according to the installation
manual, but the Red Hat 5.2 distribution supplies SHMMNI (128)
of them. That will allow each Oracle process to have a total
of up to 32 GB of shared memory (128 times 256 MB) and all it
asks for is 40 GB (10 times 4 GB), so it has plenty, IMHO.
=====
Let me say a few more words about the web page you were using
for configuration advice. That person actually **reduced** the
amount of shared memory segments by specifying **lower values**
for SHMMNI and SHMSEG (not to mention the semaphores).
I'd **STRONGLY** recommend **NOT CHANGING** those other values!
Its my understanding that Oracle can make up for the smaller
maximum shared memory segment size by using more shared memory
segments. So, if you reduce those, you are essentially shooting
yourself in the foot by taking away what you are giving with
increasing the maximum segment size.
=====
Good luck, and may this farce be with you!
null

Oracle parameters related kernel parameters

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