RAW datatype in Oracle is used to store variable-length binary data or byte string values. The maximum size for a raw in a given table in 32767 bytes.RAW, varchar, and varchar2. Let me point out the major differences between them. PL/SQL does not recognize the data type and hence, it cannot have any conversions when RAW data is transferred to different systems. This data type can only be queried or can be inserted in a table.