CentOS客户端安装方法如下：
1.安装客户端
rpm -ivh /当前目录/oracle-instantclieoracle账号nt12.1-basic-12.1.0.2.0-1.x86_64.rpm
rpm -ivh /当前目录/oracle-instantclient12.1-devel-12.1.0.2.0-1.x86_64.rpm
rpm -ivh /当前目录/oracle-instantclient12.1-odbc-12.1.0.2.0-1.x86_64.rpm
rpm -ivh /当前目录/oracle-instantclient12.1-sqlplus-12.1.0.2.0-1.x86_64.rpm
填加tnsanme信息：
创建文件夹nework/admin，整个路径如：/usr/lib/oracle/12.1/client64/network/admin 加入tnsnames.ora
#tnames.ora Network Configuration File: /opt/oracle/app/product/11.2.0/dbhome_1/network/admin/tnsnames.ora# Generated by Oracle configuration tools.ORCL =(DESCRIPTION =(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.14.31)(PORT = 1521))(CONNECT_DATA =(SERVER = DEDICATED)(SERVICE_NAME = orcl)))
2、配置环境信息：
请打开 /etc/profile 文件，在这个文件里面追加如下内容：
export ORACLE_BASE=/usr/lib/oracle/12.1export ORACLE_HOME=$ORACLE_BASE/client64export LD_LIBRARY_PATH=$ORACLE_HOME/lib:$LD_LIBRARY_PATHexport NLS_LANG=AMERICAN_AMERICA.AL32UTF8export SQLPATH=/usr/lib/oracle/12.1/client64/network/adminexport TNS_ADMIN=/home/oracle/network/admin
运行 #> source /etc/profile 命令使该profile立即生效
再次运行vi .bash_profile ，加入下面这个：
export PATH=$PATH:$HOME/bin:$ORACLE_HOME/bin
3、验证是否登陆成功：
sqlplus xxx/xxx@192.168.14.31:1521/orcl