Import Utility Without Duplication

I planning to export one Schema from an Oracle database (let say DB1) and I want to import it into another Oracle database (let say DB2). However, DB2 already has the exported Schema along with its contents (Tables and its data/records), but the data/records in the Tables is/are old. Therefore I want to import the data from DB1 into DB2 while ensuring that there will be no duplication in DB2, is that possible?
The reason for that because the mentioned Schema contains more than 1000 tables and it will be a hassle for me clearing all corresponding tables in DB2 before using the import utility.
I am running Oracle 9i R2 on Windows 2000 Server for both DBs.

If data already exists at the target database, or at least the empty table, when you attempt to import to it you will receive duplicate rows since you must issue the import command with the IGNORE=Y clause.
You should clear all 1000 tables prior to performing the import, this is not a big deal, you don't have to manually do it, you can create a sql script out of sql to perform the truncate table command prior to performing the import.
One more option you have is to export with the query clause, if it is possible to find a key that let you find the subset of new rows at the source database, such as a primary key or an insert date column.
If you have primary keys on all target tables, then you can issue the import with the IGNORE=Y option, there will be plenty of errors at the time you perform the import, but these errors can be ignored as long as they refer to duplicated rows rejected by the primary key enforcement.
Another option is to evaluate using the merge command through db links.
~ Madrid

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>
umesh sahoo wrote:
> Dear Friends,
>
> Pl explain the detail for Import process without Excise. what are the condition types has to be maintained .
>
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