Finding and removing non ascii characters from an Oracle Varchar2

Question

We are currently migrating one of our oracle databases to UTF8 and we have found a few records that are near the 4000 byte varchar limit. When we try and migrate these reco

Answer 1

The select may look like the following sample:

select nvalue from table
where length(asciistr(nvalue))!=length(nvalue)  
order by nvalue;