Overcoming VARCHAR2 size limitation

Hi,
We have a VARCHAR2 column in a table to store text information. At present the size is 4000. We want to increase the size to 7000.
Can anyone help me giving your suggessions?
Oneway is we can change the datatype to LONG (as you know the max size is 4000 for VARCHAR2) . But this will not solve the purpose as I need to apply functions on this column (like SUBSTR,etc).
Thanks.

You can use dbms_lob functions to access CLOBS, so changing the datatype may not be as problematic as you think.
Also, in PL/SQL the VARCHAR2 limit is 32767, not 4000, so if you're accessing the table via a stored procedure you can change the column datatype to CLOB. Provided the data is less than 32767 in length you can use a PL/SQL variable to manipulate it.
Incidentally, use CLOB not LONG for future compatibility.

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