Drivers are pieces of software that transport data, usually across a network. They
perform operations such as connect, disconnect, signal errors, and test for errors.
Drivers are specific to a communications protocol, and there is always a default driver.
You can install multiple drivers (such as the asynchronous or DECnet drivers) and
select one as the default driver, but allow an individual user to use other drivers by
specifying the desired driver at the time of connection. Different processes can use
different drivers. A single process can have concurrent connections to a single
database or to multiple databases (either local or remote) using different Oracle Net
可以装多个驱动 , 然后选定一个作为默认驱动.
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