Returns the number of bytes stored in a LONG or LONG RAW field. Not available at design time and read-only at run time.
Returns the number of bytes stored in a LONG or LONG RAW field, up to a value of around 64 KB. If the field contains more than 64 KB, then the FieldSize method returns -1.
Oracle Database does not return the length of columns that are greater than 64 KB; The only way to determine the length is to retrieve the column. To conserve resources, columns of lengths greater than 64 KB are not retrieved automatically.