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SQLLoader for Data Migration

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Hi All,
We are building our J2EE based sofware with Oracle Database. Customers who will buy this new software, have to migrate huge data (more that a few million records) from their existing tables to Oracle database.
Unfortunately, old data are in unstructured and not normailized tables and the data structure will be totally different from our current Oracle Schema.
1) Could SQLLoader be used here?
2) How fast the data transer would happen? The requirement is to migrate the data as quickly as possible.
3)Is SQLLoader Oracle Specific?
4) How complicated to migrate the data using SQLLOADER?
Thanks in Advance
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