Use Type 4 driver for applet to database communication.

2. Use Type 2 driver for two tiered applications for communication between java client and the database that gives better performance when compared to Type1 driver

3. Use Type 1 driver if your database doesn't support a driver. This is rare situation because almost all major databases support drivers or you will get them from third party vendors.

4.Use Type 3 driver to communicate between client and proxy server ( weblogic, websphere etc) for three tiered applications that gives better performance when compared to Type 1 & 2 drivers.

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