Expanding varchar2 column

A co-worker needs to modify a varchar2 column from 100 bytes to 200
bytes in a large table.  We think that it will just modify the data
dictionary and not do a full table scan.  Does anyone know for sure?
Yep, I've RTFM'd and google'd and metalink'd it.  Thx.
Mark Strickland
Seattle, WA

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