一、配置oracle用户下的环境变量
# .bash_profile
# Get the aliases and functions
if [ -f ~/.bashrc ]; then
. ~/.bashrc
fi
# User specific environment and startup programs
PATH=$PATH:$HOME/bin
export PATH
TMP=/tmp; export TMP
TMPDIR=$TMP; export TMPDIR
ORACLE_BASE=/data/oracle; export ORACLE_BASE
ORACLE_HOME=$ORACLE_BASE/product/11.2.0/dbhome_1; export ORACLE_HOME
ORACLE_SID=orcl; export ORACLE_SID
ORACLE_TERM=xterm; export ORACLE_TERM
PATH=$ORACLE_HOME/bin:/usr/sbin:$PATH:$ORACLE_HOME/inventory/Scripts/ext/lib; export PATH
LD_LIBRARY_PATH=$ORACLE_HOME/lib:$ORACLE_HOME/inventory/Scripts/ext/lib:/lib:/usr/lib; export LD_LIBRARY_PATH
CLASSPATH=$ORACLE_HOME/JRE:$ORACLE_HOME/jlib:$ORACLE_HOME/rdbms/jlib:$oracle_HOME/inventory/Scripts/ext/lib; export CLASSPATH
umask 022
二、/etc/hosts文件设置
127.0.0.1 oracle.shichang localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
注意上面红色的部分，这是主机名，一定要添加进去。不然netca的时候通不过
三、CentOs防火墙/etc/sysconfig/iptables配置，打开一个1521端口，让客户机可以连到Oracle
# Firewall configuration written by system-config-firewall
# Manual customization of this file is not recommended.
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 1521 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT
四、强制安装libaio包(否则无法dbca)
rpm -ivh --force libaio-0.3.105-2.i386.rpm
rpm -ivh --force libaio-devel-0.3.105-2.i386.rpm