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Originally Posted by GTLS inside the bracket is the size in Bytes. Those are not MYSQL Types as ****** said. They are data-types. You can check on MySQL Wiki to see the size limits of all database. The more you put size, more memory it occupies in RAM. So make sure, not to use extra size inside your variables. Its called Memory Optimization.

actually that's just the display size. it will always occupy the size of whatever the specified type is