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You might be finding so many other places about the instructions with screen shots to install oracle database 12c, and this is just another place to find the same content. The actual purpose to create this database is to use for oem 12c installation. So just collected the installation screen shots to present if it helps some newbies.

Download the software for database 12c. Download

Complete all the following pre-requisites before starting the oracle database 12c installation.

1. Hardware requirement:
    RAM - 1.5 GB min
    Swap - 1.5*RAM ( this is optional, we can configure temporary swap )
    /tmp space - 1GB min
    ORACLE_HOME -- 6.5GB

2. Software Requirements : 
2.1 Check OS version and Kernel : 

[root@db12c ~]# cat /etc/redhat-release
CentOS release 6.5 (Final)
[root@db12c ~]# uname -r
2.6.32-431.3.1.el6.x86_64
[root@db12c ~]#

2.2 Install all the required rpms. The following table lists all the required rpms for database 12c. This table is copied from the MOS ID 1587357.1
If you have configured YUM repository for your server, you can use the following commands to install rpms. Refer my other article to know how to configure YUM to your distribution.

yum install <rpm name>. 

If you don't have YUM configured, you need to copy all the below specified rpms from your CentOS 6.5 distribution CD and need to install manually.

rpm -ivh <rpm name>

OS Version	Patches/Packages	Kernel settings
Oracle Linux 6 with the Unbreakable Enterprise kernel: 2.6.39-200.24.1.el6uek.x86_64 or later Oracle Linux 6 with the Red Hat Compatible kernel: 2.6.32-71.el6.x86_64 or later Red Hat Enterprise Linux 6: 2.6.32-71.el6.x86_64 or later Red Hat Enterprise Linux 6 with the Unbreakable Enterprise Kernel: 2.6.32-100.28.5.el6.x86_64 or later Reference : Note 1529864.1	binutils-2.20.51.0.2-5.11.el6 (x86_64) glibc-2.12-1.7.el6 (x86_64) libgcc-4.4.4-13.el6 (x86_64) libstdc++-4.4.4-13.el6 (x86_64) libaio-0.3.107-10.el6 (x86_64) libXext-1.1 (x86_64) libXtst-1.0.99.2 (x86_64) libX11-1.3 (x86_64) libXau-1.0.5 (x86_64) libxcb-1.5 (x86_64) libXi-1.3 (x86_64) make-3.81-19.el6 sysstat-9.0.4-11.el6 (x86_64) compat-libcap1-1.10-1 (x86_64) compat-libstdc++-33-3.2.3-69.el6 (x86_64) gcc-4.4.4-13.el6 (x86_64) gcc-c++-4.4.4-13.el6 (x86_64) glibc-devel-2.12-1.7.el6 (x86_64) ksh  <== any version of ksh is acceptable libstdc++-devel-4.4.4-13.el6 (x86_64) libaio-devel-0.3.107-10.el6 (x86_64) Some depended RPMS for above listed packages cloog-ppl.x86_64 0:0.15.7-1.2.el6 cpp.x86_64 0:4.4.6-4.el6 glibc-headers.x86_64 0:2.12-1.80.el6 kernel-headers.x86_64 0:2.6.32-279.el6 mpfr.x86_64 0:2.4.1-6.el6 ppl.x86_64 0:0.10.2-11.el6	/etc/sysctl.conf kernel.shmmni = 4096 kernel.sem = 250 32000 100 128 fs.file-max = 6815744 fs.aio-max-nr = 1048576 Note: This value limits concurrent outstanding requests and should be set to avoid I/O subsystem failures. net.ipv4.ip_local_port_range = 9000 65500 net.core.rmem_default = 262144 net.core.rmem_max = 4194304 net.core.wmem_default = 262144 net.core.wmem_max = 1048576 /etc/security/limits.conf oracle   soft    nproc    2047 oracle   hard   nproc   16384 oracle   soft    nofile    1024 oracle   hard   nofile    65536 oracle   soft    stack    10240 oracle   hard   stack    10240 /etc/pam.d/login session required pam_limits.so /etc/profile if [ $USER = "oracle" ]; then     if [ $SHELL = "/bin/ksh" ]; then        ulimit -u 16384        ulimit -n 65536     else        ulimit -u 16384 -n 65536     fi fi

Session Log For Reference:

[root@db12c ~]# egrep --color 'Mem|Cache|Swap' /proc/meminfoMemTotal:       49423668 kB
MemFree:         7364136 kB
Cached:         34088520 kB
SwapCached:         8060 kB
SwapTotal:      24780792 kB
SwapFree:       23905912 kB
[root@db12c ~]# df -h /tmpFilesystem                       Size  Used Avail Use% Mounted on
/dev/mapper/vg_db12c-lv_root   11G  5.1G  5.3G  50% /
[root@db12c ~]# df -h /homeFilesystem                       Size  Used Avail Use% Mounted on
/dev/mapper/vg_db12c-lv_home  2.7T  641G  1.9T  25% /home
[root@db12c ~]# cat /etc/redhat-releaseCentOS release 6.5 (Final)
[root@db12c ~]# uname -r2.6.32-431.3.1.el6.x86_64
[root@db12c ~]#
[root@db12c ~]# rpm -qa | grep -i binutils-binutils-2.20.51.0.2-5.36.el6.x86_64
[root@db12c ~]# rpm -qa | grep -i glibcglibc-devel-2.12-1.132.el6.i686
glibc-common-2.12-1.132.el6.x86_64
glibc-2.12-1.132.el6.x86_64
glibc-devel-2.12-1.132.el6.x86_64
glibc-headers-2.12-1.132.el6.x86_64
glibc-2.12-1.132.el6.i686
[root@db12c ~]# rpm -qa | grep -i libgcclibgcc-4.4.7-4.el6.x86_64
libgcc-4.4.7-4.el6.i686
[root@db12c ~]# rpm -qa | grep -i libstdc++libstdc++-4.4.7-4.el6.i686
libstdc++-4.4.7-4.el6.x86_64
libstdc++-devel-4.4.7-4.el6.x86_64
compat-libstdc++-33-3.2.3-69.el6.x86_64
compat-libstdc++-296-2.96-144.el6.i686
libstdc++-devel-4.4.7-4.el6.i686
[root@db12c ~]# rpm -qa | grep -i libaiolibaio-devel-0.3.107-10.el6.i686
libaio-0.3.107-10.el6.x86_64
libaio-devel-0.3.107-10.el6.x86_64
libaio-0.3.107-10.el6.i686
[root@db12c ~]# rpm -qa | grep -i libXextlibXext-1.3.1-2.el6.i686
libXext-devel-1.3.1-2.el6.x86_64
libXext-1.3.1-2.el6.x86_64
[root@db12c ~]# rpm -qa | grep -i libXtstlibXtst-1.2.1-2.el6.x86_64
[root@db12c ~]# rpm -qa | grep -i libX11libX11-1.5.0-4.el6.x86_64
libX11-common-1.5.0-4.el6.noarch
libX11-devel-1.5.0-4.el6.x86_64
libX11-1.5.0-4.el6.i686
[root@db12c ~]# rpm -qa | grep -i libXaulibXau-1.0.6-4.el6.i686
libXau-devel-1.0.6-4.el6.x86_64
libXau-1.0.6-4.el6.x86_64
[root@db12c ~]# rpm -qa | grep -i libxcblibxcb-1.8.1-1.el6.i686
libxcb-devel-1.8.1-1.el6.x86_64
libxcb-1.8.1-1.el6.x86_64
[root@db12c ~]# rpm -qa | grep -i libXilibXinerama-devel-1.1.2-2.el6.x86_64
libXinerama-1.1.2-2.el6.x86_64
libXi-devel-1.6.1-3.el6.x86_64
libXi-1.6.1-3.el6.i686
libXi-1.6.1-3.el6.x86_64
[root@db12c ~]# rpm -qa | grep -i makeautomake-1.11.1-4.el6.noarch
MAKEDEV-3.24-6.el6.x86_64
perl-ExtUtils-MakeMaker-6.55-136.el6.x86_64
perl-Locale-Maketext-Simple-0.18-136.el6.x86_64
make-3.81-20.el6.x86_64
[root@db12c ~]# rpm -qa | grep -i sysstatsysstat-9.0.4-22.el6.x86_64
[root@db12c ~]# rpm -qa | grep -i compat-libcap1compat-libcap1-1.10-1.x86_64
[root@db12c ~]# rpm -qa | grep -i compat-libstdc++compat-libstdc++-33-3.2.3-69.el6.x86_64
compat-libstdc++-296-2.96-144.el6.i686
[root@db12c ~]# rpm -qa | grep -i gccgcc-4.4.7-4.el6.x86_64
libgcc-4.4.7-4.el6.x86_64
libgcc-4.4.7-4.el6.i686
gcc-gfortran-4.4.7-4.el6.x86_64
gcc-c++-4.4.7-4.el6.x86_64
[root@db12c ~]# rpm -qa | grep -i gcc-c++gcc-c++-4.4.7-4.el6.x86_64
[root@db12c ~]# rpm -qa | grep -i glibc-develglibc-devel-2.12-1.132.el6.i686
glibc-devel-2.12-1.132.el6.x86_64
[root@db12c ~]# rpm -qa | grep -i kshpdksh-5.2.14-30.x86_64
[root@db12c ~]# rpm -qa | grep -i libstdc++-devellibstdc++-devel-4.4.7-4.el6.x86_64
libstdc++-devel-4.4.7-4.el6.i686
[root@db12c ~]# rpm -qa | grep -i libaio-devellibaio-devel-0.3.107-10.el6.i686
libaio-devel-0.3.107-10.el6.x86_64
[root@db12c ~]#
[root@db12c ~]# rpm -qa | grep -i cloog-pplcloog-ppl-devel-0.15.7-1.2.el6.x86_64
cloog-ppl-0.15.7-1.2.el6.x86_64
[root@db12c ~]# rpm -qa | grep -i cppcpp-4.4.7-4.el6.x86_64
abrt-addon-ccpp-2.0.8-21.el6.centos.x86_64
cppunit-1.12.1-3.1.el6.x86_64
cppunit-doc-1.12.1-3.1.el6.x86_64
mcpp-2.7.2-4.1.el6.x86_64
cppunit-devel-1.12.1-3.1.el6.x86_64
libmcpp-2.7.2-4.1.el6.x86_64
[root@db12c ~]# rpm -qa | grep -i glibc-headersglibc-headers-2.12-1.132.el6.x86_64
[root@db12c ~]# rpm -qa | grep -i kernel-headerskernel-headers-2.6.32-431.3.1.el6.x86_64
[root@db12c ~]# rpm -qa | grep -i mpfrmpfr-2.4.1-6.el6.x86_64
[root@db12c ~]# rpm -qa | grep -i pplpoppler-utils-0.12.4-3.el6_0.1.x86_64
wpa_supplicant-0.7.3-4.el6_3.x86_64
cloog-ppl-devel-0.15.7-1.2.el6.x86_64
poppler-0.12.4-3.el6_0.1.x86_64
poppler-qt4-0.12.4-3.el6_0.1.x86_64
cloog-ppl-0.15.7-1.2.el6.x86_64
gnome-python2-applet-2.28.0-5.el6.x86_64
gnome-applets-2.28.0-7.el6.centos.x86_64
ppl-devel-0.10.2-11.el6.x86_64
gdm-user-switch-applet-2.30.4-52.el6.x86_64
poppler-data-0.4.0-1.el6.noarch
ppl-0.10.2-11.el6.x86_64
[root@db12c ~]#

[root@db12c ~]# grep -i pam_limits.so  /etc/pam.d/loginsession required pam_limits.so
[root@db12c ~]#
[root@db12c ~]# gcc --versiongcc (GCC) 4.4.7 20120313 (Red Hat 4.4.7-4)
Copyright (C) 2010 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.
[root@db12c ~]# g++ --versiong++ (GCC) 4.4.7 20120313 (Red Hat 4.4.7-4)
Copyright (C) 2010 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.
[root@db12c ~]#
[root@db12c ~]#  hostnamedb12c.askmlabs.com
[root@db12c ~]#

[root@db12c ~]# /home/apps/oem12c/product/12.1.0/dbhome_1/root.sh
Performing root user operation for Oracle 12c

The following environment variables are set as:
    ORACLE_OWNER= oracle
    ORACLE_HOME=  /home/apps/oem12c/product/12.1.0/dbhome_1

Enter the full pathname of the local bin directory: [/usr/local/bin]:
   Copying dbhome to /usr/local/bin ...
   Copying oraenv to /usr/local/bin ...
   Copying coraenv to /usr/local/bin ...


Creating /etc/oratab file...
Entries will be added to the /etc/oratab file as needed by
Database Configuration Assistant when a database is created
Finished running generic part of root script.
Now product-specific root actions will be performed.
[root@db12c ~]#