A control file can specify a maximum length for the following length-value data types: VARCHAR, VARCHARC, VARGRAPHIC, VARRAW, and VARRAWC. The specified maximum length is in bytes if byte-length semantics are used for the field, and in characters if character-length semantics are used for the field. If no length is specified, then the maximum length defaults to 4096 bytes. If the length of the field exceeds the maximum length, then the record is rejected with the following error:
Variable length field exceed maximum length