Best way to load data in table from combination of Table and flat file?

Hi All,
Could you please share your thoughts on best way of achieving this objective -
Flat File - 15 Million records (Field A,B,C)
Table A - 15 Million records ( Field A,D)
Objective -
Load Field A,B,C,D in Table B from Flat file and Table A.
Data can be loaded from flat file in Table B then updated from Table A but this update operation is taking lot of time. (Intermediate Commit, Bulk operations already tried)
Regards,
Dark Knight

Environment -
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Tables are analyzed.
Indexes are their.
Update statement using the index.
Data is close to 200 MB.
I am interested in knowing if there are alternate ways of doing this, other than conventional way of loading data then updating it.

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<<Copy paste from http://careerabap.blogspot.com/2009_08_01_archive.html - user notified, points removed>>
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      koteravindra
Handle:      koteravindra
Status Level:      Newbie
Registered:      Jan 9, 2013
Total Posts:      4
Total Questions:      3 (3 unresolved)
why so many unresolved questions? Remember to close your threads marking them as answered.

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