2.
-, (). .
-, .
-, (. # 1).
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Fifth, even if you are looking for the first 200 characters, you can index them, and the search speed should be identical.
Sixth, you do not want the database design to limit your UX - what if you need to change up to 500 characters? You will have a lot of work.
This is a very obvious case of what you do not need to do in database design.
reference: as Joe Amison answered http://www.quora.com/MySQL/Which-mysql-method-is-fast
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