Answer / aanand shirodkar

1. you can deattach or reattch datapump job.
2. you can parallelise datapump job [PARALLEL=4]
3. without export can do import using NETWORK_LINK parameter
4. can calculate export dump file size using ESIMATE_ONLY
5. expdp utility used which is caled by dbms_datapump
procudure
6. remapping capabilities during import
[REMAP_DATAFILE,EMAP_SCHEMA,REMAP_TABLESPACE,REUSE_DATAFILES
]

Answer / dba

Here you can see more details..
http://shonythomas.blogspot.in/2012/02/datapump-vs-expimp-difference-or.html

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