How can we take the incremental export using the datapump at schema level.

Hi,
How can we take the incremental export using the datapump at schema level. Example, today i had taken the full export of one schema.
After 7 days from now , how can i take the export of change data , from the data of my full export.
using the export datapump parameter - FLASHBACK_TIME ,can we mention the date range. Example sysdate - (sysdate -7)
Please advice
thanks
Naveen.

Think of the Data Pump Export/Import tools as taking a "picture" or "snapshot."
When you use these utilities it exports the data as it appears (by default) while it's doing the export operation. There is no way to export a delta in comparison to a previous export.
The FLASHBACK_TIME parameter allows you to get a consistent export as of a particular point in time.
I recommend you go to http://tahiti.oracle.com. Click on your version and go to the Utilities Guide. This is where all the information on Data Pump is located and should answer a lot of your questions.

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