Best Way to Drop Large Clob Column?

I have a very large partitioned table that contains XML documents stored in a clob column. Aside from the clob column there are several varchar and numeric columns in the table that are related to each document. We have decided to move the XML out of Oracle and into text files on the OS but want to keep the other data in Oracle. Each partition has a tablespace for the clob column and a tablespace for the other columns.
What is the best (quickest/most efficient) way to drop the clob column and free up the space that it is currently using?
OS: HP-UX
Oracle: 11.2.0.3
Table Partitions: 27
Table Rows: 550,000,000
Table Size: around 15 TB with 95% of that found in the column to drop
One other wrinkle, there are several tables that have a foreign key relationship back to the primary key of the table in question. Three of those tables are multi-billion rows in size.

Hi,
You can use the mark unused column,and checkpoint in the drop column statements,
please visit the link. may it help you
http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:623063677753

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