Have you find yourself you need import a export from other server and this dump not fit in any filesytem.
Solution is very simple,from Oracle 10g now you can use network to import data from a remote database
In Oracle 10g, the Data Pump version of import can eliminate the dump file entirely by importing directly from another database instance.
The only limitation is that network_link option doesn’t support tables with LONG Columns.
1) Define database link
define dblink object to identofy database source. For example: source database in London with oracle service name LON
CREATE DATABASE LINK london CONNECT TO user1 IDENTIFIED BY temp01 USING ‘LON’;
this user have correct privileges to to access the data to be imported
2) Data Pump import
The Data Pump import command, impdp, can now use this database link to directly access remote data. The command line parameter NETWORK_LINK points to the source database via its database link.
On the local database instance in Madrid, user user2:
impdp user2/tempo03 TABLES=customers,sales DIRECTORY=dpump01 NETWORK_LINK=london
No export will be performed on the instance in London, and no dump file created.