ORacle Installation: Kernel Parameters

I was trying to install Oracle 10.2.0 on sun solaris 5.9. I got warning/error about noexec_user_stack=1: found no entry failed.
due to this, i exit out of the installation .I knew that I can add this in /etc/system but for this I need to bounce the sun box. There are some other production databases are running on this box, so i cannot reboot this box. What are the impacts of installing if I ignore this error. 10.2.0 will be a production database. What you guys recomend in this scenario.

Here's the description for this parameter:
Sometimes programs allocate buffers but do not always check the size of the data coming into these buffers. An unwanted program can overflow such a buffer by placing a pointer to its own code and take control of the application with the privileges assigned to that application. Solaris 9 introduced the option to disable execution of user programs on the stack and assist in preventing this type of issue. This feature is only available on SPARC and AMD64 systems because it requires hardware support that is not available in current Intel 32bit CPUs. The protection is setup by employing the system wide parameter 'set noexec_user_stack=1' in the /etc/system file.
When you read this you can see it's a security issue. Your database itself will run without problems. It's up to you to run the risk.
Werner

Similar Messages

Problems Installing Oracle 10GR2 & kernel parameters

Hi there,
I'm trying to install Oracle 10G on a new Solaris10 machine. After extensivley reading the oracle install guide and proceeding my install failed with an out of memory error.
Ive read the posts regarding many similar problems and to set the kernel parameters in /etc/system. My question for the experts is:
1). Is there a problem with the oracle install scripts and it not recognising the new features in Solaris?
2). Is there a more deep-rooted problem with oracle and solaris?
ANY help/advice would be much appreciated. There are hundreds of posts like this on the web and surely someone must have the answer? I mean surely oracle did not hack /etc/system to get their install to work did they??
Nibs

It IS a terrible experince to install oracle 10g on solaris 10. Tell us your system configuration and your installation step. For I have installed three times and each time a different problem. Suggest you go to oracle forum to get more help.

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.
Can you help me?

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
I don`t recognize here any of the kernel parameters listed in the installation guide for Oracle 10g XE. http://www.oracle.com/technology/software/products/database/xe/files/install.102/b25144/toc.htm (2.1.3 Server Component Kernel Parameter Requirements)
what do you mean with backup? Just copy&paste the output? If not I do I perform backup?
Can you help me?
thanks,
Kind Regards

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.

Calculating Kernel parameters for Oracle 11g R2 db on solaris 10u9

Hi Everyone,
I have query regarding calculating the kernel parameters for deploying oracle 11g R2 db on solaris 10 v 5.10 update 09 machine , we have Ram size of 64gb.
My question is how to calculate shared memory ,shared memory identifiers,semaphores, semaphores identiifiers for creating resource control for the project(user.oracle).
And how to fine out the available semphore values allocated in system..
Thanks in Advance.
Edited by: 898979 on Dec 15, 2011 10:24 PM

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]
Regard
Helios

10g Universal Installer kernel errors while installing on Solaris 5.10

Hi all,
I have been trying to install Oracle 10g on a Solaris 5.10 machine (32-bit) as per the official Oracle Documentation for a couple of days now. It seems that the Universal Installer fails it's pre-installation steps and throws up error at the following kernel parameters:
Checking for shmsys:shminfo_shmmax=4294967295; found no entry. Failed <<<<
Checking for shmsys:shminfo_shmmni=100; found no entry. Failed <<<<
Checking for semsys:seminfo_semmni=100; found no entry. Failed <<<<
Checking for semsys:seminfo_semmsl=256; found no entry. Failed <<<<
Check complete. The overall result of this check is: Failed <<<<
I have followed the Oracle Documentation which says to change the kernel parameters using the resource control facility. For this I already have a project "oracle" which the user "oracle" has been assigned to:
$ id -ap oracle
uid=100(oracle) gid=100(oinstall) groups=100(oinstall),101(dba) projid=100(oracle)
Following are the snapshots from the prctl command on the current state of the kernel paramters:
For Checking for shmsys:shminfo_shmmax=4294967295; found no entry. Failed <<<<
$ prctl -n project.max-shm-memory -i project oracle
project: 100: oracle
NAME PRIVILEGE VALUE FLAG ACTION RECIPIENT
project.max-shm-memory
privileged 254MB - deny -
system 16.0EB max deny -
The Oracle recommended value is 4GB - I expect Universal Installer check to fail for this, so I change the parameter using the resource control facility by logging in as root in a new terminal and keeping one oracle session active.
# prctl -n project.max-shm-memory -v 4gb -r -i project oracle
I can see that the parameter has been set correctly when I do:
$ prctl -n project.max-shm-memory -i project oracle
project: 100: oracle
NAME PRIVILEGE VALUE FLAG ACTION RECIPIENT
project.max-shm-memory
privileged 4.00GB - deny -
system 16.0EB max deny -
For Checking for semsys:seminfo_semmni=100; found no entry. Failed <<<<
$ prctl -n project.max-sem-ids -i project oracle
project: 100: oracle
NAME PRIVILEGE VALUE FLAG ACTION RECIPIENT
project.max-sem-ids
privileged 128 - deny -
system 16.8M max deny -
The Oracle recommended value is 100 - I do not expect Universal Installer check to fail at this parameter
For Checking for shmsys:shminfo_shmmni=100; found no entry. Failed <<<<
$ prctl -n project.max-shm-ids -i project oracle
project: 100: oracle
NAME PRIVILEGE VALUE FLAG ACTION RECIPIENT
project.max-shm-ids
privileged 128 - deny -
system 16.8M max deny -
The Oracle recommended value is 100 - I do not expect Universal Installer check to fail at this parameter
Also when I try to issue the command:
$ prctl -n project.max-sem-nsems -i project oracle
I get:
prctl: failed to get resource control for project.max-sem-nsems: Invalid argument
Oracle recommends I should set a value of 256.
After setting up all this I still get the following errors from Universal Installer:
Checking for shmsys:shminfo_shmmax=4294967295; found no entry. Failed <<<<
Checking for shmsys:shminfo_shmmni=100; found no entry. Failed <<<<
Checking for semsys:seminfo_semmni=100; found no entry. Failed <<<<
Checking for semsys:seminfo_semmsl=256; found no entry. Failed <<<<
Check complete. The overall result of this check is: Failed <<<<
Now when I modify the kernel settings by editing the /etc/system file without even a reboot I'm can see all my Universal Installer Kernel checks as passed.
Not sure if I'm missing out some crucial step while setting up the kernel parameter using the resource control facility?
~ Somjit

It is bug in OUI.
OUI is looking at /etc/system to check the kernel parameter settings, but this file is not used (by default) in Solaris 10
It should check the kernel parameter settings using the prctl.
Check metalink note 363436.1
workaround is to
./runInstaller -ignoreSysPrereqs
or as You already did, change /etc/system as well.

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

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
I noticed that the semaphore and shared memory modules are not loaded when the system boots up, instead they are only loaded when the semget or shmget commands are called by dbca. When I execute the command sysdef I notice that these kernel parameters are set to the default values not the values that I specified in /etc/system. I am new to Solaris so could someone with an expertise in it point me in the right direction.
Thanks in advance.

have a look at : - http://docs.sun.com/db/doc/816-7137?q=tunable&s=t
you can alaways come back to us if you have any questions about a specific tunable.
- Saurabh Mishra

Kernel parameters for ebs 11.5.10 and db 10.2.0.4

HI,
is there any doc describing the kernel parameters(settings) in order to install the 11.5.10 EBS System on Linux Enterprise Edition(v. 4.6).... something like the Metalink note: 265121.1(Requirements for Installing Oracle9i R2 (9.2.0) on RHEL3)...
Thank you,
Sim

Sim,
Please refer to:
Note: 294932.1 - Recommendations to Install Oracle Applications 11i
https://metalink2.oracle.com/metalink/plsql/ml2_documents.showDocument?p_database_id=NOT&p_id=294932.1
Note: 316806.1 - Oracle Applications Installation Update Notes, Release 11i (11.5.10.2)
https://metalink2.oracle.com/metalink/plsql/ml2_documents.showDocument?p_database_id=NOT&p_id=316806.1

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.
Kind regards,
Cathal

Oracle installation on more than 1 system

Hi All,
Is there any way to install oracle on more than 1 systems simultaneously? Please let me know if there is any.
Thanks in advance.

I am assuming what you want to do is "clone" your ORACLE_HOME on one server to all the others.
Have been doing this since 9i to make an exact copy of ORACLE_HOME in prod for use in test, uat or devt.
The advantage is even you patches get carried over exactly as-is.
From what you have said, this is the first-time install on all servers so it will be a bit easier.
Some prerequisites for this to work easily and smoothly on all hosts you want to install on:
1. Set the oracle user and its dba, oinstall groups to use the same uid and gid respectively.
2. Configure Solaris packages, kernel parameters and oracle user permissions/limits as stated in the installation guide.
3. Setup a common directory structure for ORACLE_BASE (which should not be the same as the login /home/oracle directory)
such as /u00/app/oracle and ORACLE_HOME such as /u00/app/oracle/product/10.2.0/db_1
4. Configure a common inventory directory (usually $ORACLE_BASE/oraInventory)
- this will be copied over also from the first to the other nodes.
5. Configure the .profile of the Oracle user as needed by the install docs (and customize as you wish)
6. Configure a common way of transferring files across the nodes either by:
a. setting up rsh/rcp or ssh/scp equivalence - e.g. you can copy a file as oracle on one server to the other with no password
prompt and the permissions are easily preserved - I use ssh usually and the steps are:
a) generate a key: ssh-keygen - t rsa (just press enter for prompts)
b) copy the $HOME/.ssh/id_rsa.pub to a new file authorized_keys
c) you will later copy authorized_keys to each other node other than the first so that the first server can "push" a file
to them from the first server
b. configure a NAS for NFS or simply setup the first server as a NFS server
7. Configure a directory readable/writable for Oracle to contain files to push to other servers such as /u00/tmp
First, proceed with installation of the software on the first node and apply patches, if any, that you want.
Create a test database if you want to confirm that it works and maybe run netca if needed to make a prototype tnsnames.ora
(you need to setup a listener independently per server).
Then, do a tar cvzf /u00/tmp/ohome.gz $ORACLE_HOME. Also copy into /u00/tmp $ORACLE_BASE/oraInventory, /etc/oraInst.loc
(this may be /var/opt/oracle/oraInst.loc for Solaris) and and /etc/oratab (if any).
Then, on each server other than the first:
1. Copy over the .profile from the first server
2. Copy over ohome.gz either from NFS or else by doing scp from the first server
3. Extract the ORACLE_HOME by tar xvzf /u00/tmp/ohome/gz
4. Copy oraInventory to $ORACLE_BASE/oraInventory
5. Copy /etc/oraInst.loc and /etc/oratab
You should now be able to run everything on the new server when you login as oracle.
As a post install, you can also relink the executables such as the Oracle binary by:
1. cd $ORACLE_HOME/rdbms/lib
2. make -f ins_rdbms.mk ioracle
You can also refer to Metalink note 559304.1 and 565009.1
By using same oracle user id and group across nodes, you avoid the complication and need for Metalink note 558478.1.
Hope this helps!
Raffy Ramirez

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

Unable to set kernel parameters using solaris 10

HI,
I'm trying to install DB2 8.2 on solaris 10.the problem i'm encountering in installation is unable to set MSGMAX and MSGMNB kernel parameters. I tried setting the new replacement parameter process.max-msq-qbytes through projects->Resource Control from the management console.but still uinable to set the parameters.
Can anyone help me in setting the above kernel parameters.
Its not possible to set it thru /etc/system.
thanx
guru

HI,
I'm trying to install DB2 8.2 on solaris 10.the problem i'm encountering in installation is unable to set MSGMAX and MSGMNB kernel parameters. I tried setting the new replacement parameter process.max-msq-qbytes through projects->Resource Control from the management console.but still uinable to set the parameters.
Can anyone help me in setting the above kernel parameters.
Its not possible to set it thru /etc/system.
thanx
guru

ORacle Installation: Kernel Parameters

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