LONG VARRAW is a VARRAW with a 4-byte length subfield instead of a 2-byte length subfield.
LONG VARRAW results in a VARRAW with 4-byte length subfield and a maximum size of 4 KB (that is, the default). LONG VARRAW(300000) results in a VARRAW with a length subfield of 4 bytes and a maximum size of 300000 bytes.
LONG VARRAW fields can be loaded between systems with different byte orders if the appropriate technique is used to indicate the byte order of the length subfield. See "Byte Ordering".