Oracle 10g R 10.2 for Linux x86-64 - /proc/sys/vm/disable_cap_mlock problem

Question

Hi All,
During installation - Oracle Database Configuration Assistance, I have got below error and thus I stuck. As per Metalink note 293988.1, this will be resolved if I do [root@localhos]# echo 1 > /proc/sys/vm/disable_cap_mlock . But problem is when I do this because I dont have /proc/sys/vm/disable_cap_mlock file in my system, it giving ¨bash: /proc/sys/vm/disable_cap_mlock: No such file or directory¨ error. So I am unable to get rid of this error. I also set SELinux Default and Current mode as permissible and rebooted it.
No use, Its giving same error.
ORA-27125: Unable to create shared memory segment.
DB Details_
Oracle 10g Release 2 (10.2) for Linux x86-64
Choosen Basic Installation
OS Details:_
*[root@localhost vm]# uname -rm*
2.6.32-100.0.19.el5 x86_64
*[root@localhost vm]# uname -a*
Linux localhost.localdomain 2.6.32-100.0.19.el5 #1 SMP Fri Sep 17 17:51:41 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux
*[root@localhost etc]# cat /etc/redhat-release*
Red Hat Enterprise Linux Server release 5.5 (Tikanga)
*[root@localhost etc]# make -v*
GNU Make 3.81
Copyright (C) 2006 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.
This program built for x86_64-redhat-linux-gnu
This is bugging me since last two days. Any help would be appreciated.
Thanks in advance.
Regards,
Mahi

Answer 1

From what I can gather form your post, the ORA-27125: Unable to create shared memory segment is probably the result of:
a) not enough physical memory available.
b) /dev/shm not configured properly.
c) kernel parameters are not set according to Oracle requirements.
Since this is happening during the installation of Oracle I suggest to check the SHMMAX kernel parameter. This is all mentioned in the pre-installation steps. Oracle 11g will actually check these kernel parameters prior to installing. Not sure about 10g now, which you are trying to install.
The most common, easiest way to prepare the system for Oracle RDBMS is to install the "oracle-validated" package. If you don't have access to ULN, you can setup public yum.
http://public-yum.oracle.com/ Then you can simply type as the root user: yum install oracle-validated
Edited by: waldorfm on Nov 3, 2010 1:18 PM