Forum: Rails-core (closed, excessive spam) Alter column name from varchar2 to clob.

Hi everyone.
    I need to alter a table column which is of type varchar2 to clob.
There is soo much of data in the varchar2 column. But through migration
if I use a simple change_column to change the datatype, will there be
any problem because of the data ???

Thanks in advance ..
Jazzy .. :)