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Reference : Designing JDBC Applications for Performance Optimization : Returning Data
  

Returning Data

To return data efficiently, return only the data that you need and choose the most efficient method of doing so. The guidelines in this section will help you optimize system performance when retrieving data with JDBC applications.
In this section: 
* Returning Long Data
* Reducing the Size of Returned Data
* Choosing the Right Data Type
* Retrieving Result Sets