Centos 6.5 Install Oracle 12C database

Oracle has been releasing Oracle for 12C for some time and Oracle has only 64-bit releases and no 32-bit version. Our system installation environment is CentOS 6.5 x86_64.
1. Install Oracle Dependency Pack
Modify the Yum configuration and install 32-bit and 64-bit RPM by default
Yum install binutils compat-libcap1 compat-libstdc++-33 gcc gcc-c++ glibc glibc-devel ksh libgcc libstdc++ libstdc++-devel Libaio-devel libxext libxtst libX11 libxau libxcb libxi make Sysstat Libaio

2. Configure users
2.1. Create related users and user groups
/usr/sbin/groupadd Oinstall
/usr/sbin/groupadd DBA
/USR/SBIN/USERADD-G oinstall-g dba Oracle
#如果已经创建过oracle can perform
/USR/SBIN/USERMOD-G oinstall-g dba Oracle

2.2 Modifying system kernel Parameters
Cp/etc/sysctl.conf/etc/sysctl.conf.bak

Vim/etc/sysctl.conf
FS.AIO-MAX-NR = 1048576
Fs.file-max = 6815744
Kernel.shmall =33554432
Kernel.shmmax = 137438953472
Kernel.shmmni = 4096
Kernel.sem = 250 32000 100 128
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 = 1048586

To view the ID of an Oracle user group
more/etc/passwd
Oracle:x:500:501::/home/oracle:/bin/bash

Modify large Memory limit
echo >/proc/sys/vm/hugetlb_shm_group
Vi/etc/sysctl.conf
vm.hugetlb_shm_group=500

Modify User Limits
Vi/etc/security/limits.conf
Add the following:
Oracle Soft Nofile 65536
Oracle Hard Nofile 65536
Oracle Soft Nproc 16384
Oracle Hard Nproc 16384
Oracle Stack Nproc 16384

2.3 Creating a Directory
Mkdir-p/u01/app/
Chown-r oracle:oinstall/u01/app/
Chmod-r 775/u01/app/

2.4 Configuration Network Configuration hosts
Hostname
Oracle12
Vi/etc/hosts
127.0.0.1 Oracle12

2.5 Configuring environment variables
Su–oracle
Echo $SHELL
/bin/bash

CD ~
VI. bash_profile

Tmp=/tmp
Tmpdir=/tmp
Export TMP Tmpdir

3 formally install Oracle
3.1 First extract the files to the Oracle User directory and enter the database directory.
Xhost +
CD ~
Unzip unzip Linuxamd64_12c_database_1of2.zip
Unzip unzip Linuxamd64_12c_database_2of2.zip
CD Database
./runinstaller
4 Follow-up work
4.1. Configure Environment variables
CD ~
VI. bash_profile

########## for Oracle ##########
Oracle_base=/u01/app/oracle
Export Oracle_base
Oracle_home= $ORACLE _base/product/12.1.0/dbhome_1
Export Oracle_home
oracle_sid=orcl.org
Export Oracle_sid
Path= $PATH:: $ORACLE _home/bin
Export PATH
5 Difficult questions:
Ora-00845:memory_target not supported on this system was encountered during installation
The problem is that the size of the SGA exceeds the size of the operating system/DEV/SHM the problem is that the SGA is set larger than the operating system/DEV/SHM size
View SHM Size:
[Oracle@localhost dbs]$ df-h/dev/shm
File system capacity used available% mount point
Tmpfs 2.0G 0 2.0G 0%/dev/shm.
Use the/etc/fstab file to modify the/DEV/SHM size:
Add the size=100g after the tmps, then uninstall the/DEV/SHM and then mount it again.
Umount/dev/shm
Mount-all
If/dev/shm can't unload
# UMOUNT/DEV/SHM
Umount:/dev/shm:device is busy.
Treated with Fuser
# FUSER-KM/DEV/SHM
When you start Oracle again, there is no problem.