Max Char Size Attribute MaxCharSize (MCS) Purpose Specifies the maximum size of columns of type SQL_CHAR that the driver describes through result set descriptions and catalog functions. Valid Values A positive integer from 1 to 10485760 When not specified, the actual size of the columns from the database is persisted to the application. If you specify a value that is not in the specified range, the driver uses the maximum value of the SQL_CHAR data type. Default None. The actual size of the columns from the database is persisted to the application. GUI Tab Advanced tab