Why plsql cannot connect to oracle

Ora-12154 causes and solutions to solve a large online, but the following: 1. the local environment variable oracle_home is not set. 2. due to the installation of excessive versions of oracle, the instance version first loaded in plsql is incorrect. Solution: click Cancel when logging on, select the corresponding directory and version for oraclehome, tools, and preferences. But it was not my food. I finally opened the book and saw such a thing. Oracle's Net Service has a Bug in parsing the connection and cannot parse the parentheses included in the path. Therefore, do not select parentheses for plsql installation.



Author: Dingh. wang