toad连接出现问题：
可能是一些环境变量被修改了，比如昨天我碰到的问题
d:\oracle\ora92\BIN 被修改了，在path 里面将其配置好，就可以了
正常的配置信息如下：
(Oracle Root)
ORACLE_HOME = d:\oracle\ora92
ORACLE_SID =
NLS_LANG = NA
SQLPATH =
d:\oracle\ora92\BIN is in system PATH
d:\oracle\ora92\BIN does exist
Client dll found oci.dll
oci.dll version: 9.2.0.1.0
(Oracle Root) is valid
HOME0
ORACLE_HOME_NAME = OraHome92
ORACLE_HOME = d:\oracle\ora92
ORACLE_SID = NHOALG
NLS_LANG = SIMPLIFIED CHINESE_CHINA.ZHS16GBK
SQLPATH = d:\oracle\ora92\dbs
d:\oracle\ora92\BIN is in system PATH
d:\oracle\ora92\BIN does exist
Client dll found oci.dll
oci.dll version: 9.2.0.1.0
HOME0 is valid
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同事遇到问题，toad安装好一次后，就打不开了
是版本的问题，换了一个版本就好了
7.6--8.0