PL/SQL不安装Oracle连接数据库
1、下载instantclient-basic-win32-11.2.0.1.0此为压缩包，解压就行(路径如：D:\oracle\instantclient\instantclient).解压的路径自行调整
2、新建tnsnames.ora文件,路径如（D:\oracle\instantclient\instantclient\NETWORK\ADMIN\tnsnames.ora)建议tnsnames.ora从其他安装好的版本处修改,内容如下：
DEFC =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.3.19.213)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = orcl)
)
)
ORCL =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = orcl)
)
)
EXTPROC_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
)
(CONNECT_DATA =
(SID = PLSExtProc)
(PRESENTATION = RO)
)
)
3、
用户变量中新建：（不进行此操作,容易出现PL/SQL查询数据中文乱码）
变量名：nls_lang
变量值：SIMPLIFIED CHINESE_CHINA.ZHS16GBK
系统变量Path中添加如D:\oracle\instantclient\instantclient
4、PLSQl参数修改，配置好后，重新启动生效(位置为工具-首选项)
启动PL/SQL Developer，在登录窗口界面,点击取消按钮就可以进行主界面,点击Tools->Preferences，在Connection中需要配置如下两个参数：
Oracle Home如：D:\oracle\instantclient\instantclient
OCI Library入：D:\oracle\instantclient\instantclient\oci.dll
5、重新启动PL/SQL能够正常连接
