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The ulimit facility provides hard and soft limits. With the ulimit command, you can change your soft limits, up to the maximum set by the hard limits.
To see current hard and soft limits:
Account specific limits are set in /etc/security/limits.conf. You will most likely need to increase the limits of the Oracle user. In particular add the following:
oracle soft nofile 131072
oracle hard nofile 131072
oracle soft nproc 131072
oracle hard nproc 131072
oracle soft core unlimited
oracle hard core unlimited
oracle soft memlock 50000000
oracle hard memlock 50000000
The oracle-validated package does more than just triggering the installation of additional packages. It also sets various system kernel and oracle account parameters. For details:
# wget http://public-yum.oracle.com/repo/OracleLinux/OL5/latest/x86_64/oracle-validated-1.1.0-17.el5.x86_64.rpm
# rpm2cpio oracle-validated-1.1.0-17.el5.x86_64.rpm | cpio -idmv
Then analyze the files.