The most effective way from varchar2 to CLOB?

this is my table's TAB structure on Oracle 10g r2:
TAB_ID (PK),
TAB2_ID (FK constraint to TAB2(TAB2_ID), index created),
TEXT varchar2(4000)
What is the most effective way to convert varchar2(4000) column to CLOB column?
1. create new table TAB_NEW with column TEXT as CLOB,
then insert /*+ APPEND */ into TAB_NEW SELECT * FROM TAB,
then rename table TAB to TAB_OLD,
then drop constraint and indexes
then rename TAB_new to TAB
then add constraints primary key and foreign key,
then add index on TAB2_ID
then drop table TAB_OLD
OR
2. rename column TEXT(varchar2) to TEXT_OLD
then add column TEXT(type CLOB)
then update(how the most effective?) TAB set TEXT=TEXT_OLD
drop column TEXT_OLD.

1 will work, as you can assign a VARCHAR2 to a CLOB and Oracle will convert it.
2 is redundant.
Sybrand Bakker
Senior Oracle DBA

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[URL="http://freedomvideography.com"]Wisconsin Wedding Videography[/URL]

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