Oracle database system in design offers four levels of interfaces, including the User layer, the SQL layer, the Transformation and the I/O layer, its structure is:
Among the four layers, when using SQL interface for data loading, is called the User layer,
Call directly to the I/O layer during the data through the bottom of the Oracle function writing system, so the DSG RealSync has certain advantage in loading layer;
The original address: http://www.cnblogs.com/oracle-dsg/archive/2010/05/27/1745477.html
About the four layer interface is not clear, hope the great spirit guide, or introduce some relevant information
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