052-102

You want to import schema objects of the HR user using Oracle Data Pump from the development database, DEVDB, to the production database, PRODDB. A database link devdb.us.oracle.com is created between PRODDB and DEVDB.
You execute the following command on the PRODDB database server:
$ impdp system/manager directory = DB_DATA
dumpfile = schemas.dat
schemas = hr
flashback_time = "TO_TIMESTAMP('25-08-2007 14:35:00', 'DD-MM-YYYY HH24:MI:SS')"
The command fails displaying the following error:
ORA-39001: invalid argument value
ORA-39000: bad dump file specification
ORA-31640: unable to open dump file "/home/oracle/schema/schemas.dat" for read
ORA-27037: unable to obtain file status
What would you do to overcome the error?
A.Add the user, SYSTEM, to the schemas option.
B.Add the network_link = devdb.us.oracle.com option.
C.Change the dumpfile option to schema.dat@devdb.us.oracle.com.
D.Replace the schemas option with the network_link = devdb.us.oracle.com option.
E.Replace the dumpfile option with the network_link = devdb.us.oracle.com option.

通过 database link 导数据需要提供参数 network_link ，这时不会生成 dump file，所以不需要 dumpfile 参数。