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:/etc

export PATH ;;

esac

# Check if the root user is running this script

if [ $(id -u) != "0" ]

then

echo "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_1

export 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。