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$grep oinstall /etc/group
$grep dba /etc/group
$grep nobody /etc/group

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$sudo addgroup oinstall
$sudo addgroup dba
$sudo addgroup nobody
$sudo useradd -m -g oinstall -G
dba -p passwd -d /home/oracle -s /bin/bash oracle
$sudo usermod -g nobody nobody

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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

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$sudo sysctl -p

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/etc/security/limits.conf
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* soft nproc 2407
* hard nproc 16384
* soft nofile 1024
* hard nofile 65536

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