Oracle varchar2 to nvarchar2 conversion

Question

If I change an existing column type from varchar2 to nvarchar2 in Oracle will Oracle automatically convert existing column data between character set or should I do it myself?

I'm using Oracle 11g, the varchar2 character set is WE8MSWIN1252 and the nvarchar2 character set is AL16UTF16

Solution

You can use the package DBMS_REDEFINITION for doing the changing the varchar2 to nvarchar2 column for a table

Please find the below link which might be helpful

Using Online Table Redefinition to Migrate a Large Table to Unicode

Also find the documentation for General Character set Migration

General Character set Migration