Understand large object data types (BLOB, CLOB, DBCLOB)

The large object data types are defined here.

Binary large objects (BLOBs) — A binary string made up of bytes with no associated code page. This data type can store binary data larger than VARBINARY (32K limit). This data type is good for storing image, voice, graphical, and other types of business or application-specific data.
Character large objects (CLOBs) — A character string made up of single-byte characters with an associated code page. This data type is appropriate for storing text-oriented information where the amount of information can grow beyond the limits of a regular VARCHAR data type (upper limit of 32K bytes). Code page conversion of the information is supported.
Double-byte character large objects (DBCLOBs) — A character string made up of double-byte characters with an associated code page. This data type is appropriate for storing text-oriented information where double-byte character sets are used. Again, code page conversion of the information is supported.