Red Hat ENTERPRISE LINUX AS 2.1 - Instalační příručka stáhnout pdf (Strana 34)

Chapter 11. Setting Shell Limits for the Oracle User

entire system will run out of file handles. This may prevent users logging in as the system

cannot open any PAM modules that are required for the login process. That is why the

hard limit should be set to 63536 and not 65536.

That these limits work you also need to ensure that pam_limits is configured in the /etc/pam.d/

system-auth file, or in /etc/pam.d/sshd for ssh, /etc/pam.d/su for su, or /etc/pam.d/

the two session entries in the /etc/pam.d/system-auth file:

session required /lib/security/$ISA/pam_limits.so

session required /lib/security/$ISA/pam_unix.so

Note the ulimit options are different for other shells.

$ su - oracle

$ ulimit -n

4096

The default limit for oracle is now 4096 and the oracle user can increase the number of file handles up

to 63536:

$ su - oracle

$ ulimit -n

4096

$ ulimit -n 63536

$ ulimit -n

63536

To make this change permanent, you could add "ulimit -n 63536" ,for bashbash, to the

~oracle/.bash_profile file which is the user start up file for the bash shell on Red Hat Enterprise

Linux (to verify your shell execute echo $SHELL). To do this you could simply copy and paste the

following commands for oracle's bash shell:

su - oracle

cat >> ~oracle/.bash_profile << EOF

ulimit -n 63536

EOF

To make the above changes permanent, you could also set the soft limit equal to the hard limit in /

etc/security/limits.conf:

oracle soft nofile 63536

oracle hard nofile 63536

11.2. Limiting Maximum Number of Processes Available for

the Oracle User

After reading the procedure on, Section 11.1, “Limiting Maximum Number of Open File Descriptors for

the Oracle User” you should now have an understanding of "soft" and "hard" limits and how to change

shell limits.

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Red Hat ENTERPRISE LINUX AS 2.1 - Instalační příručka Strana 34