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How much of a difference does using tinyint or smallint (when applicable) instead of just int do? Or restricting a char field to the minimum characters needed?
Do these choices affect performance or just allocated space?
On an Indexed field with a significantly large table the size of your field can make a large affect on performance. On a nonindexed field its not nearly as important bit it still has to write the extra data.
That said, the downtime of a resize of a large table can be several minutes or several hours even, so don’t make them smaller than you’d imagine ever needing.