Need to update a single column in a table with some other column value

Hi experts,
I was about to change one column data type in a table. Then I renamed that column name to "old_column_name" . Later I added new column name with required datatype( My case its NCLOB). Now I want to update the new column value with old column value.I mean i have to copy the data. But data amount is very huge. Its more than 1.5 crores of data. But on promote day, I have only 1 hr of outage. Please suggest the effective solution to achieve this.

Hi Stew
I have 1 primary key in my table and 11 foreign keys in my table.there are 20 check constraints as well.
If i go for an online redefine of a table, these objects will be created back automatically?
Please clarify.
This is my table. Here Remarks is the column with CLOB datatype. To support multi language, I need to change it to NCLOB. That column having data so i cant rename it.
So I added new column , after renaming that remarks to old_remarks. Now new column remarks is ready with NCLOB data type, but no data in it.
To copy the old remarks column into new remarks column, i thought to write one script. But how it is achievable using "DBMS_REDEFINITION". Please explain me,
create table XXXXXXXXXX
ID NUMBER(8),
COMPLETED_DATE DATE,
COMMUNICATION_MEDIUM VARCHAR2(32),
REMARKS1 VARCHAR2(4000),
COPY VARCHAR2(1),
IO_MARKER VARCHAR2(3),
EVENT_DATE DATE,
CON_REF_NO NUMBER(8),
DEP_CODE VARCHAR2(6),
SFM_STAFF_NO NUMBER(8),
CRPD_ID NUMBER(8),
CRPD_ID_COPY NUMBER(8),
STATUS VARCHAR2(2),
COMEBACK_NO NUMBER(2),
ADD_ADD_ID NUMBER(10),
AEV_ID NUMBER(8),
OLAY_ID NUMBER(8),
COE_TYPE VARCHAR2(3),
CET_CODE VARCHAR2(6),
DEP_CODE_RAISED_BY VARCHAR2(6),
SFM_STAFF_NO_RAISED_BY NUMBER(8),
USR_CREATED VARCHAR2(30),
CREATED DATE,
USR_CHANGED VARCHAR2(30),
CHANGED DATE,
EXT_REF_ID VARCHAR2(150),
REPLY_EXPECTED_DATE DATE,
SEC_ID VARCHAR2(8) not null,
PROTECTED VARCHAR2(1),
APPROVED_BY NUMBER(8),
DOCUMENT BLOB,
OLD_REMARKS CLOB,
CTS_ID NUMBER(8),
MESSAGE_STATUS VARCHAR2(4),
WORD_DOCUMENT NCLOB,
REMARKS NCLOB
Edited by: Hema on Jul 2, 2012 8:31 AM
Edited by: Hema on Jul 2, 2012 8:31 AM

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-Raj Suchak
[email protected]

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alpha
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100
1
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a
b
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col1
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Your friend is obviously not a reliable source of HTML
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> One of my friends advised me to develop my whole site on
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> as its
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> but I couldnot make an ordinary table with rows and
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