update a LONG column HOWTO

I have LONG column in 9.2.0.3 database, i am updating
as follows thru database link, i Could update them if
the column size is small, The column might be some kb
not MB, how to specify the size of LONG Column
SQL> set LONG 320000
SQL> l
  1  declare
  2  l_str LONG;
  3  begin
  4  select content into l_str from tos@devvdv where
tos_id = 2012;
  5* end;
SQL> /
declare
*
ERROR at line 1:
ORA-01406: fetched column value was truncated

ANY SUGGESTIONS
-sarath

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