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Sorry for jumping in.
About #1: since 'performance' is something vague in this question, I would add that many client applications calculate the buffers and memory sizes for queries (resultsets) based on data types, thus one client app must reserve more memory than actually needed.
I aggree with Dieter about having care in design. Also, limited sizes can give you an aditional error-check level in data entry.
Cheers.
Carlos.