Oracle data Type -4____oracle

18, NCLOB
You can use character sets that are defined by the database international character set to store character-based data that is only Unicode type. You can store up to 4GB of data, which is larger than the maximum amount of data that can be stored in the ORACLE10G database, which is now a factor in the size of the database block (~4gb* data block size).

19. BLOB
You can store up to 4GB of binary large objects of data, which is larger than the maximum amount of data stored in the ORACLE10G database, which is now a factor in the size of the database block (~4gb* database block size).

20, BFILE
Stores a locator that points to an external file in the database. The maximum external file is 4GB.

21, Binary_float
The data type is a floating-point data type based on the ansi_ieee745 standard. It defines a 32-bit double-precision floating-point number. This data type requires 5B of storage space.

22, Binary_double
The data type is a double-precision floating-point data type based on the ansi_ieee745 standard, which defines a 32-bit double-precision floating-point number. This data type requires storage space for the 9B section.