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Oracle Kernel parameters

Posted on 2010-11-17
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Last Modified: 2012-05-10
Hey what Oracle Kernel parameters do we need to know as an Oracle DBA. I really appreciate your help. Thanks in advance
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Question by:hussainkhan22
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16 Comments
 
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by:slightwv (䄆 Netminder)
ID: 34157810
These can be found where?  Of course: The online docs.

You will need to check the installation guide for your specific OS.  This will have the important ones.
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Huseyin KAHRAMAN earned 100 total points
ID: 34157890
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by:Chakravarthi Ayyala
ID: 34160085
Do you mean kernel parameters for Oracle on Linux/Sun ?
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by:slightwv (䄆 Netminder)
ID: 34160712
Based on their previous questions it would be AIX.
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by:hussainkhan22
ID: 34163541
Yes kernel parameters for oracle on linux/sol
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by:slightwv (䄆 Netminder)
slightwv (䄆 Netminder) earned 200 total points
ID: 34163621
Have to even tried looking for the installation guides on the online docs?  It's really quite easy.

Go to:  http://www.oracle.com/pls/db112/portal.all_books

Look for:
Database Installation Guide for Linux
Database Installation Guide for Oracle Solaris

http://download.oracle.com/docs/cd/E11882_01/install.112/e17163/pre_install.htm#CIHBJIFJ

http://download.oracle.com/docs/cd/E11882_01/install.112/e16763/pre_install.htm#CHDCFJJE
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by:Joseph Gan
Joseph Gan earned 100 total points
ID: 34166819
For Enterprise Linux 4.5, the following lines should be appended to the "/etc/sysctl.conf" file.
kernel.shmall = 2097152
kernel.shmmax = 2147483648 # Smallest of -> (Half the size of the physical memory) or (4GB - 1 byte)
kernel.shmmni = 4096
# semaphores: semmsl, semmns, semopm, semmni
kernel.sem = 250 32000 100 128
net.ipv4.ip_local_port_range = 1024 65000
net.core.rmem_default=4194304
net.core.rmem_max=4194304
net.core.wmem_default=262144
net.core.wmem_max=262144
For Enterprise Linux 5.0, the following lines should be appended to the "/etc/sysctl.conf" file.
kernel.shmmni = 4096
# semaphores: semmsl, semmns, semopm, semmni
kernel.sem = 250 32000 100 128
net.ipv4.ip_local_port_range = 1024 65000
net.core.rmem_default=4194304
net.core.rmem_max=4194304
net.core.wmem_default=262144
net.core.wmem_max=262144
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by:slightwv (䄆 Netminder)
slightwv (䄆 Netminder) earned 200 total points
ID: 34167164
ganjos,

That appears to be a copy/paste from a website.  When you do this you need to paste the link of the site so the original author gets credit:

http://www.oracle-base.com/articles/11g/OracleDB11gR1InstallationOnEnterpriseLinux4and5.php
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Expert Comment

by:Joseph Gan
ID: 34167561
That was in my notes. I was doing similar thing. Forgot which website I got from.
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by:madunix
madunix earned 100 total points
ID: 34168891
http://ivan.kartik.sk/oracle/install_ora10gR2_redhat.html
kernel.shmall = 2097152
kernel.shmmax = 2147483648
kernel.shmmni = 4096
kernel.sem = 250 32000 100 128
fs.file-max = 65536
net.ipv4.ip_local_port_range = 1024 65000
net.core.rmem_default = 262144
net.core.rmem_max = 262144
net.core.wmem_default = 262144
net.core.wmem_max = 262144
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by:slightwv (䄆 Netminder)
ID: 34168994
@madunix,

I'm on mobile right now so I can't verify this but is what you posted different than what ganjos posted previously?
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by:madunix
ID: 34169076
@slightwv
same as  oracle-base
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by:Chakravarthi Ayyala
ID: 34169663
In addition to all these, if you have big memory and using huge pages, those paraemters have to be set separately.
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by:Chakravarthi Ayyala
ID: 34169672
vm.nr_hugepages is the parameter for huge page setting.
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by:Chakravarthi Ayyala
ID: 34170256
Hello hussainkhan22,
  Could you please answer the following questions?

1. How much RAM you have?
2. How much memory you want to allocate for Oracle?
3. Reason for asking Q 2 is to suggest you the values for parameters like shmmax accordingly.

 
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by:slightwv (䄆 Netminder)
ID: 34172790
This question is likely derived from a previous question:
http://www.experts-exchange.com/Database/Oracle/Q_26618357.html
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