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Configure the ulimit

One of the Oracle Enterprise Manager 12c installation prerequisites is to increase the number of file descriptors to at least 4096. As root, edit the /etc/security/limits.conf file and add the following two entries:
<UID> soft nofile 4096
<UID> hard nofile 4096
If using oracle-rdbms-server-12cR1-preinstall the settings will be in the oracle-rdbms-server-12cR1-preinstall.conf file. As root, edit the /etc/security/limits.d/oracle-rdbms-server-12cR1-preinstall.conf file as shown in the next example.
oracle    soft    nofile    1024
oracle    soft    nofile    4096
There is also a limit on the number of max user processes in the  /etc/security/limits.d/90-nproc.conf file. As root, edit the /etc/security/limits.d/90-nproc.conf file and make the following changes.
*    soft    nproc    1024
*    -    nproc    16384
Confirm the new limits by looking at output of ulimit -a:
$ su - oracle
$ ulimit -a
core file size (blocks, -c) 0
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 0
file size (blocks, -f) unlimited
pending signals (-i) 96073
max locked memory (kbytes, -l) 64
max memory size (kbytes, -m) unlimited
open files (-n) 4096
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) 10240
cpu time (seconds, -t) unlimited
max user processes (-u) 16384
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited

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