不安装oracle服务端，使用PL/SQL连接数据库

想在本地通过PL/SQL连接服务器的oracle，又不想安装庞大的oracle，这是方法

下载instantclient-basic-nt-11.2.0.3.0包，这里下的是11.2.0.3.0版本

新建oracle_client文件夹，将instantclient-basic-nt-11.2.0.3.0解压缩至此（如d:/oracle_client）

在d:/oracle_client目录下新建Sqlnet.ora文件，内容如下：

# This file is actually generated by netca. But if customers choose to
# install "Software Only", this file wont exist and without the native
# authentication, they will not be able to connect to the database on NT.

SQLNET.AUTHENTICATION_SERVICES = (NTS)

Tnsnames.ora文件，内容如下：

# tnsnames.ora Network Configuration File: d:\oracle_client \tnsnames.ora
# Generated by Oracle configuration tools.

UCRC_FWQ =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.8.5)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = ucrc)
)
)

变量名：TNS_ADMIN

值：d:/oracle_client

若不设置会报ORA-12154: TNS:could not resolve the connect
identifier specified错误。如果之前安装Oracle 又卸载了，会遗留NLS_LANG=NA的键值。打开注册表项HKEY_LOCAL_MACHINE/SOFTWARE/ORACLE。在右面找到NLS_LANG=NA并删除掉，否则会报ORA-12705:
Cannot access NLS data files or invalid 错误。

工具——选项——连接——Oracle主目录名

设置为d:/oracle_client

Oci库设置为d:/oracle_client/oci.dll