en.wikipedia.org/wiki/JDBC_driverThe JDBC type 2 driver, also known as the
Native-API driver, is a database driver implementation that uses the client-side libraries of the database The driver converts
JDBC method calls into native calls of the database API.
In oneline ... this need dbClient to be installed on the machine.
The JDBC type 4 driver, also known as the Direct to Database
Pure Java Driver, is a database driver implementation that converts
JDBC calls directly into a vendor-specific database protocol.