问题
and how does it differ from the regular connection string?
回答1:
Connecting with the instant client is no different than with the full stack client - all connect string formats are the same. If you installed the instant client in a non-standard location on the filesystem or are having problems connecting to the database listener, be sure that your TNS_ADMIN environment points to the directory that contains your tnsnames.ora and sqlnet.ora files,
回答2:
Here is a comprehensive list of connection strings for Oracle (http://www.connectionstrings.com/oracle)
回答3:
The format is:
name/pass@//host:1521/instance
Standard Oracle connect strings typically look like
name/pass@tnsentry
Where tnsentry has been defined by one of several means such as a tnsnames.ora file. idstram's answer has an excellent pointer if you're looking for more details.
来源：https://stackoverflow.com/questions/764916/oracle-what-is-the-instantclient-connection-string-format