If I set the charset as UTF and continue to the next steps(CMT increases its size to 3 times). Then if going backward and change the charset as EUC, CMT still has 3 times bigger column size, not 2 times up size.
CMT currently increases the all of CHAR or VARCHAR column size by 2 ~ 3 times. However in the real word, not all coloumns have values in Korean. Some columns have "YES", "101.203.405", "134-040" and so on.
For user's convenience, CMT has a option for multi-byte characters and ask the user to choose its characterset.
If user enables "EUC-KR" option and CMT asks "Do you want to change all the column size of CHAR and VARCHAR as 2X?" If the user clicks "yes" then CMT automatically changes the column size however if "no" then users will choose only few of string columns.