Oracle官方已放出18c企业版的RPM安装包，但仅限于单机版。相对于之前的版本，省去了前期规划配置的繁琐步骤。

1、下载Oracle RPM安装包

从官网选择rpm格式的安装包，下载即可。如下图：

2、使用yum安装

我这里使用的为oracle linux，软件源用的是oracle软件源，安装如下：

[root@odb03 ~]# yum -y localinstall /u02/oracle-database-ee-18c-1.0-1.x86_64.rpm 

RPM安装默认的目录为/opt，安装前确保/opt拥有足够的空间。

3、配置Oracle 18c数据库

安装完成后，会产生两个文件：一个是管理oracle服务的脚本(/etc/init.d/oracledb_ORCLCDB-18c)，另一个是定义数据文件存放路径的文件(/etc/sysconfig/oracledb_ORCLCDB-18c.conf)。
根据实际情况修改以上两个文件，这里修改了数据文件存放的路径为/u03/oradata以及默认的实例名为testdb。如果更改了默认的实例名，则/etc/sysconfig/oracledb_ORCLCDB-18c.conf文件也该更改为对应的实例名，这里为/etc/sysconfig/oracledb_testdb-18c.conf。

[root@odb03 ~]# vi /etc/sysconfig/oracledb_testdb-18c.conf
#This is a configuration file to setup the Oracle Database.
#It is used when running '/etc/init.d/oracledb_ORCLCDB configure'.
#Please use this file to modify the default listener port and the
#Oracle data location.# LISTENER_PORT: Database listener
LISTENER_PORT=1521# ORACLE_DATA_LOCATION: Database oradata location
ORACLE_DATA_LOCATION=/u03/oradata# EM_EXPRESS_PORT: Oracle EM Express listener
EM_EXPRESS_PORT=5500
[root@odb03 ~]# vi /etc/init.d/oracledb_ORCLCDB-18c
#!/bin/bash
#
# chkconfig: 2345 80 05
# Description: This script is responsible for taking care of configuring the Oracle Database and its associated services.
#
# processname: oracledb_ORCLCDB-18c
# Red Hat or SuSE config: /etc/sysconfig/oracledb_ORCLCDB-18c
## Set path if path not set
case $PATH in"") PATH=/bin:/usr/bin:/sbin:/etcexport PATH ;;
esac# Check if the root user is running this script
if [ $(id -u) != "0" ]
thenecho "You must be root user to run the configurations script. Login as root user and try again."exit 1
fi# Setting the required environment variables
export ORACLE_HOME=/opt/oracle/product/18c/dbhome_1export ORACLE_VERSION=18c
export ORACLE_SID=testdb
export TEMPLATE_NAME=General_Purpose.dbc
export CHARSET=AL32UTF8
export PDB_NAME=kettel
export LISTENER_NAME=LISTENER
export NUMBER_OF_PDBS=1
export CREATE_AS_CDB=true
......

修改完成后，执行/etc/init.d/oracledb_ORCLCDB-18c configure命令创建数据库实例以及监听，如下：

[root@odb03 ~]# /etc/init.d/oracledb_ORCLCDB-18c configure
Configuring Oracle Database testdb.
Prepare for db operation
8% complete
Copying database files
31% complete
Creating and starting Oracle instance
32% complete
36% complete
40% complete
43% complete
46% complete
Completing Database Creation
51% complete
54% complete
Creating Pluggable Databases
58% complete
77% complete
Executing Post Configuration Actions
100% complete
Database creation complete. For details check the logfiles at:/opt/oracle/cfgtoollogs/dbca/testdb.
Database Information:
Global Database Name:testdb
System Identifier(SID):testdb
Look at the log file "/opt/oracle/cfgtoollogs/dbca/testdb/testdb.log" for further details.Database configuration completed successfully. The passwords were auto generated, you must change them by connecting to the database using 'sqlplus / as sysdba' as the oracle user.

其实，这个configure就是调用dbca的静默模式创建数据库实例。创建完成后，根据上面的提示修改系统用户的密码即可。

4、Using 18c OEM

Oracle 18c默认会开启Enterprise Manager Database Express，修改完sys密码之后，就可以通过如下格式访问：https://ip:5500/em。