使用toad连接oracle时提示找不到客户端，下面分享一下处理过程
1、到ORACLE 网站下载instantclient客户端
https://www.oracle.com/database/technologies/instant-client/winx64-64-downloads.html
2、Oracle Instatnt Client解压至指定目录（自定义）如本例中放到如下目录
D:\program\instantclient_18_5
3、配置系统变量
NLS_LANG = AMERICAN_AMERICA.ZHS16GBK TNS_ADMIN = D:\program\instantclient_18_5LD_LIBRARY_PATH = D:\program\instantclient_18_5 SQLPATH = D:\program\instantclient_18_5
ORACLE_HOME = D:\program\instantclient_18_5
Path（在变量中加入） D:\program\instantclient_18_5
5、添加配置文件sqlnet.ora和tnsnames.ora
sqlnet.ora代码如下：
# sqlnet.ora Network Configuration File: /u01/app/oracle/product/11.2.0/db_1/network/admin/sqlnet.ora # Generated by Oracle configuration tools. NAMES.DIRECTORY_PATH= (TNSNAMES, EZCONNECT) ADR_BASE = D:\program\instantclient_18_5
tnsnames.ora代码如下：
ORCL = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.233)(PORT = 1521)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = orcl) ) )
6、通过toad连接OK
原文：https://www.cnblogs.com/lkj371/p/12809195.html