可能有些朋友还不知道，Oracle 推出了完全免费的 Express 版本，虽然存在一些功能限制，但是这个版本是完全免费的，只要你需要，可以随意适用。
可能有些朋友还不知道，Oracle 推出了完全免费的 Express 版本，虽然存在一些功能限制，但是这个版本是完全免费的，只要你需要，可以随意适用。
现在，Oracle 也将这个版本的安装简化到了极致。 安装这个版本，你只需要两个步骤：
- 第一：安装preinstall安装包
- 第二：安装数据库软件包
两者都简约到极致，第一步，下载安装预需求包：
代码语言：javascript复制curl -o oracle-database-preinstall-18c-1.0-1.el7.x86_64.rpm https://yum.oracle.com/repo/OracleLinux/OL7/latest/x86_64/getPackage/oracle-database-preinstall-18c-1.0-1.el7.x86_64.rpm
yum -y localinstall oracle-database-preinstall-18c-1.0-1.el7.x86_64.rpm第二步，安装数据库软件包，从 OTN 直接抓取软件，你不需要帐号，不需要登录：
代码语言：javascript复制yum -y install https://download.oracle.com/otn-pub/otn_software/db-express/oracle-database-xe-18c-1.0-1.x86_64.rpm
一些基本的输出如下：
代码语言：javascript复制[root@enmodb1 ~]# cat /etc/redhat-release
CentOS Linux release 7.2.1511 (Core)
[root@enmodb1 ~]# curl -o oracle-database-preinstall-18c-1.0-1.el7.x86_64.rpm https://yum.oracle.com/repo/OracleLinux/OL7/latest/x86_64/getPackage/oracle-database-preinstall-18c-1.0-1.el7.x86_64.rpm
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 18244 100 18244 0 0 6888 0 0:00:02 0:00:02 --:--:-- 6889
[root@enmodb1 ~]# yum -y localinstall oracle-database-preinstall-18c-1.0-1.el7.x86_64.rpm
Loaded plugins: fastestmirror
Examining oracle-database-preinstall-18c-1.0-1.el7.x86_64.rpm: oracle-database-preinstall-18c-1.0-1.el7.x86_64
Marking oracle-database-preinstall-18c-1.0-1.el7.x86_64.rpm to be installed
Resolving Dependencies
--> Running transaction check
---> Package oracle-database-preinstall-18c.x86_64 0:1.0-1.el7 will be installed
--> Processing Dependency: compat-libcap1 for package: oracle-database-preinstall-18c-1.0-1.el7.x86_64
Loading mirror speeds from cached hostfile
* base: mirrors.cqu.edu.cn
* epel: mirrors.yun-idc.com
* extras: mirrors.cqu.edu.cn
* updates: mirrors.cqu.edu.cn
--> Processing Dependency: compat-libstdc -33 for package: oracle-database-preinstall-18c-1.0-1.el7.x86_64
--> Processing Dependency: ksh for package: oracle-database-preinstall-18c-1.0-1.el7.x86_64
--> Processing Dependency: xorg-x11-utils for package: oracle-database-preinstall-18c-1.0-1.el7.x86_64
--> Running transaction check
---> Package compat-libcap1.x86_64 0:1.10-7.el7 will be installed
---> Package compat-libstdc -33.x86_64 0:3.2.3-72.el7 will be installed
---> Package ksh.x86_64 0:20120801-139.el7 will be installed
---> Package xorg-x11-utils.x86_64 0:7.5-23.el7 will be installed
--> Processing Dependency: libdmx.so.1()(64bit) for package: xorg-x11-utils-7.5-23.el7.x86_64
--> Processing Dependency: libXxf86dga.so.1()(64bit) for package: xorg-x11-utils-7.5-23.el7.x86_64
--> Processing Dependency: libXv.so.1()(64bit) for package: xorg-x11-utils-7.5-23.el7.x86_64
--> Running transaction check
---> Package libXv.x86_64 0:1.0.11-1.el7 will be installed
---> Package libXxf86dga.x86_64 0:1.1.4-2.1.el7 will be installed
---> Package libdmx.x86_64 0:1.1.3-3.el7 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
======================================================================================================================================================
Package Arch Version Repository Size
======================================================================================================================================================
Installing:
oracle-database-preinstall-18c x86_64 1.0-1.el7 /oracle-database-preinstall-18c-1.0-1.el7.x86_64 55 k
Installing for dependencies:
compat-libcap1 x86_64 1.10-7.el7 base 19 k
compat-libstdc -33 x86_64 3.2.3-72.el7 base 191 k
ksh x86_64 20120801-139.el7 base 885 k
libXv x86_64 1.0.11-1.el7 base 18 k
libXxf86dga x86_64 1.1.4-2.1.el7 base 19 k
libdmx x86_64 1.1.3-3.el7 base 16 k
xorg-x11-utils x86_64 7.5-23.el7 base 114 k
Transaction Summary
======================================================================================================================================================
Install 1 Package ( 7 Dependent packages)
Total size: 1.3 M
Total download size: 1.2 M
Installed size: 4.3 M
Downloading packages:
(1/7): compat-libcap1-1.10-7.el7.x86_64.rpm | 19 kB 00:00:00
(2/7): compat-libstdc -33-3.2.3-72.el7.x86_64.rpm | 191 kB 00:00:00
(3/7): libXv-1.0.11-1.el7.x86_64.rpm | 18 kB 00:00:00
(4/7): libXxf86dga-1.1.4-2.1.el7.x86_64.rpm | 19 kB 00:00:00
(5/7): ksh-20120801-139.el7.x86_64.rpm | 885 kB 00:00:00
(6/7): libdmx-1.1.3-3.el7.x86_64.rpm | 16 kB 00:00:00
(7/7): xorg-x11-utils-7.5-23.el7.x86_64.rpm | 114 kB 00:00:00
------------------------------------------------------------------------------------------------------------------------------------------------------
Total 1.5 MB/s | 1.2 MB 00:00:00
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Installing : compat-libcap1-1.10-7.el7.x86_64 1/8
Installing : compat-libstdc -33-3.2.3-72.el7.x86_64 2/8
Installing : libXxf86dga-1.1.4-2.1.el7.x86_64 3/8
Installing : libXv-1.0.11-1.el7.x86_64 4/8
Installing : ksh-20120801-139.el7.x86_64 5/8
Installing : libdmx-1.1.3-3.el7.x86_64 6/8
Installing : xorg-x11-utils-7.5-23.el7.x86_64 7/8
Installing : oracle-database-preinstall-18c-1.0-1.el7.x86_64 8/8
Verifying : libdmx-1.1.3-3.el7.x86_64 1/8
Verifying : ksh-20120801-139.el7.x86_64 2/8
Verifying : libXv-1.0.11-1.el7.x86_64 3/8
Verifying : oracle-database-preinstall-18c-1.0-1.el7.x86_64 4/8
Verifying : libXxf86dga-1.1.4-2.1.el7.x86_64 5/8
Verifying : compat-libstdc -33-3.2.3-72.el7.x86_64 6/8
Verifying : xorg-x11-utils-7.5-23.el7.x86_64 7/8
Verifying : compat-libcap1-1.10-7.el7.x86_64 8/8
Installed:
oracle-database-preinstall-18c.x86_64 0:1.0-1.el7
Dependency Installed:
compat-libcap1.x86_64 0:1.10-7.el7 compat-libstdc -33.x86_64 0:3.2.3-72.el7 ksh.x86_64 0:20120801-139.el7 libXv.x86_64 0:1.0.11-1.el7
libXxf86dga.x86_64 0:1.1.4-2.1.el7 libdmx.x86_64 0:1.1.3-3.el7 xorg-x11-utils.x86_64 0:7.5-23.el7
Complete!安装数据库：
代码语言：javascript复制[root@enmodb1 ~]# yum -y install https://download.oracle.com/otn-pub/otn_software/db-express/oracle-database-xe-18c-1.0-1.x86_64.rpm
Loaded plugins: fastestmirror
oracle-database-xe-18c-1.0-1.x86_64.rpm | 2.3 GB 00:33:09
Examining /var/tmp/yum-root-EsjN01/oracle-database-xe-18c-1.0-1.x86_64.rpm: oracle-database-xe-18c-1.0-1.x86_64
Marking /var/tmp/yum-root-EsjN01/oracle-database-xe-18c-1.0-1.x86_64.rpm to be installed
Resolving Dependencies
--> Running transaction check
---> Package oracle-database-xe-18c.x86_64 0:1.0-1 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
======================================================================================================================================================
Package Arch Version Repository Size
======================================================================================================================================================
Installing:
oracle-database-xe-18c x86_64 1.0-1 /oracle-database-xe-18c-1.0-1.x86_64 5.2 G
Transaction Summary
======================================================================================================================================================
Install 1 Package
Total size: 5.2 G
Installed size: 5.2 G
Downloading packages:
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Installing : oracle-database-xe-18c-1.0-1.x86_64 1/1
[INFO] Executing post installation scripts...
[INFO] Oracle home installed successfully and ready to be configured.
To configure Oracle Database XE, optionally modify the parameters in '/etc/sysconfig/oracle-xe-18c.conf' and then execute '/etc/init.d/oracle-xe-18c configure' as root.
Verifying : oracle-database-xe-18c-1.0-1.x86_64 1/1
Installed:
oracle-database-xe-18c.x86_64 0:1.0-1
Complete!配置数据库：
代码语言：javascript复制[root@enmodb1 ~]# /etc/init.d/oracle-xe-18c configure
Specify a password to be used for database accounts. Oracle recommends that the password entered should be at least 8 characters in length, contain at least 1 uppercase character, 1 lower case character and 1 digit [0-9]. Note that the same password will be used for SYS, SYSTEM and PDBADMIN accounts:
Confirm the password:
Configuring Oracle Listener.
Listener configuration succeeded.
Configuring Oracle Database XE.
Enter SYS user password:
***********
Enter SYSTEM user password:
************
Enter PDBADMIN User Password:
**********
Prepare for db operation
7% complete
Copying database files
29% complete
Creating and starting Oracle instance
30% complete
31% complete
34% complete
38% complete
41% complete
43% complete
Completing Database Creation
47% complete
50% complete
Creating Pluggable Databases
54% complete
71% complete
Executing Post Configuration Actions
93% complete
Running Custom Scripts
100% complete
Database creation complete. For details check the logfiles at:
/opt/oracle/cfgtoollogs/dbca/XE.
Database Information:
Global Database Name:XE
System Identifier(SID):XE
Look at the log file "/opt/oracle/cfgtoollogs/dbca/XE/XE.log" for further details.
Connect to Oracle Database using one of the connect strings:
Pluggable database: enmodb1/XEPDB1
Multitenant container database: enmodb1
Use https://localhost:5500/em to access Oracle Enterprise Manager for Oracle Database XE连接数据库：
代码语言：javascript复制[oracle@enmodb1 ~]$ export ORACLE_SID=XE
[oracle@enmodb1 ~]$ export ORACLE_HOME=/opt/oracle/product/18c/dbhomeXE
[oracle@enmodb1 ~]$ export PATH=$PATH:$ORACLE_HOME/bin
[oracle@enmodb1 ~]$ sqlplus / as sysdba
SQL*Plus: Release 18.0.0.0.0 - Production on Sat Feb 22 10:28:08 2020
Version 18.4.0.0.0
Copyright (c) 1982, 2018, Oracle. All rights reserved.
Connected to:
Oracle Database 18c Express Edition Release 18.0.0.0.0 - Production
Version 18.4.0.0.0
SQL> select banner from v$version;
BANNER
--------------------------------------------------------------------------------
Oracle Database 18c Express Edition Release 18.0.0.0.0 - Production
SQL> select name from v$datafile;
NAME
--------------------------------------------------------------------------------
/opt/oracle/oradata/XE/system01.dbf
/opt/oracle/oradata/XE/sysaux01.dbf
/opt/oracle/oradata/XE/undotbs01.dbf
/opt/oracle/oradata/XE/pdbseed/system01.dbf
/opt/oracle/oradata/XE/pdbseed/sysaux01.dbf
/opt/oracle/oradata/XE/users01.dbf
/opt/oracle/oradata/XE/pdbseed/undotbs01.dbf
/opt/oracle/oradata/XE/XEPDB1/system01.dbf
/opt/oracle/oradata/XE/XEPDB1/sysaux01.dbf
/opt/oracle/oradata/XE/XEPDB1/undotbs01.dbf
/opt/oracle/oradata/XE/XEPDB1/users01.dbf
11 rows selected.现在学习和接触 Oracle 数据库变得很简单！
