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# Data Format Optimization

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By default, TopLink optimizes data access by accessing the data from JDBC in the format the application requires. For example, TopLink retrieves `long` data types from JDBC instead of having the driver return a `BigDecimal` that TopLink would then have to convert into a `long`.

Some older JDBC drivers do not perform data conversion correctly and conflict with this optimization. In this case, you can disable this optimization (see "Configuring Advanced Options").

See Also

  Data Access Optimization
  Optimization