安装Oracle客户端挺费时间的，而且大部分功能都用不到，Oracle官方给出了简易客户端，直接解压就可以使用，下载地址：
下面来看安装步骤：
1、下载安装包，我这里把所有的都下载下来了
instantclient-basic-linux.x64-12.2.0.1.0.zip
instantclient-basiclite-linux.x64-12.2.0.1.0.zip
instantclient-jdbc-linux.x64-12.2.0.1.0.zip
instantclient-odbc-linux.x64-12.2.0.1.0-2.zip
instantclient-sdk-linux.x64-12.2.0.1.0.zip
instantclient-sqlplus-linux.x64-12.2.0.1.0.zip
instantclient-tools-linux.x64-12.2.0.1.0.zip
2、unzip解压
解压出来一个目录instantclient_12_2
3、配置环境变量
export ORACLE_HOME=/home/tst1/instantclient_12_2
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$ORACLE_HOME
export PATH=$ORACLE_HOME:$PATH
4、配置tns
[tst1@rhel7 instantclient_12_2]$ mkdir -p network/admin
[tst1@rhel7 instantclient_12_2]$ cd network/admin/
[tst1@rhel7 admin]$ cat tnsnames.ora
ora11g =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.56.22)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = ora11g)
)
)
5、测试sqlplus，成功
[tst1@rhel7 admin]$ sqlplus zx/zx@ora11g
SQL*Plus: Release 12.2.0.1.0 Production on Thu Nov 16 12:48:33 2017
Copyright (c) 1982, 2016, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL>
6、安装sqlldr，我安装的这个版本的简易客户端中有sqlldr，如果没有的话需要从其他客户端或服务端中拷贝，但是我测试执行sqlldr报错：
[tst1@rhel7 instantclient_12_2]$ sqlldr
Message 2100 not found; No message file for product=RDBMS, facility=ULMessage 2100 not found; No message file for product=RDBMS, facility=UL[tst1@rhel7 instantclient_12_2]$
因为缺少mesg文件，从服务端把rdbms/mesg下的文件全部拷贝
12 [tst1@rhel7 instantclient_12_2]$ mkdir -p rdbms/mesg
[tst1@rhel7 instantclient_12_2]$ cp /u01/app/oracle/product/12.2/db_home1/rdbms/mesg/* rdbms/mesg/
再次执行sqlldr成功
7、安装oerr，简易客户端中没有oerr命令，需要从服务端拷贝
[tst1@rhel7 instantclient_12_2]$ cp /u01/app/oracle/product/12.2/db_home1/bin/oerr ./
[tst1@rhel7 instantclient_12_2]$ oerr
/home/tst1/instantclient_12_2/oerr: line 29: /home/tst1/instantclient_12_2/perl/bin/perl: No such file or directory
执行报错，说明缺少文件，从服务端拷贝
[tst1@rhel7 instantclient_12_2]$ cp -r /u01/app/oracle/product/12.2/db_home1/perl/* ./
[tst1@rhel7 instantclient_12_2]$ cp -r /u01/app/oracle/product/12.2/db_home1/perl/* ./perl/
[tst1@rhel7 instantclient_12_2]$ oerr ora 1
Can't open perl script "/home/tst1/instantclient_12_2/bin/oerr.pl": (null)
[tst1@rhel7 instantclient_12_2]$ mkdir bin
[tst1@rhel7 instantclient_12_2]$ scp /u01/app/oracle/product/12.2/db_home1/bin/oerr.pl ./bin/
[tst1@rhel7 instantclient_12_2]$ oerr ora 1
Could not open facilities list file: /home/tst1/instantclient_12_2/lib/facility.lis
2
[tst1@rhel7 instantclient_12_2]$ mkdir lib
[tst1@rhel7 instantclient_12_2]$ cp /u01/app/oracle/product/12.2/db_home1/lib/facility.lis ./lib/
[tst1@rhel7 instantclient_12_2]$ oerr ora 1
00001, 00000, "unique constraint (%s.%s) violated"
// *Cause: An UPDATE or INSERT statement attempted to insert a duplicate key.
// For Trusted Oracle configured in DBMS MAC mode, you may see
// this message if a duplicate entry exists at a different level.
// *Action: Either remove the unique restriction or do not insert the key.
注意：oerr也使用到了rdbms/mesg目录下的文件，只不过第6步把整个目录都拷贝过来了，这里就省事了。
8、安装tnsping，简易安装包里也没有这个工具，需要从服务端拷贝
[tst1@rhel7 instantclient_12_2]$ cp /u01/app/oracle/product/12.2/db_home1/bin/tnsping ./
[tst1@rhel7 instantclient_12_2]$ tnsping
TNS Ping Utility for Linux: Version 12.2.0.1.0 - Production on 16-NOV-2017 13:09:12
Copyright (c) 1997, 2016, Oracle. All rights reserved.
TNS-03502: Message 3502 not found; No message file for product=network, facility=TNS
执行报错，因为缺少mesg文件
123456789101112 [tst1@rhel7 instantclient_12_2]$ cp -r /u01/app/oracle/product/12.2/db_home1/network/mesg/ ./network/
[tst1@rhel7 instantclient_12_2]$ tnsping 192.168.56.22:1521/ora11g
TNS Ping Utility for Linux: Version 12.2.0.1.0 - Production on 16-NOV-2017 13:11:04
Copyright (c) 1997, 2016, Oracle. All rights reserved.
Used parameter files:
Used HOSTNAME adapter to resolve the alias
Attempting to contact (DESCRIPTION=(CONNECT_DATA=(SERVICE_NAME=ora11g))(ADDRESS=(PROTOCOL=TCP)(HOST=192.168.56.22)(PORT=1521)))
OK (10 msec)
安装成功。