Question

Oracle Database 11g: New Features in datapump

Answer 1

COMPRESSION parameter in expdp

One of the big issues with Data Pump was that the dumpfile couldn't be compressed while getting created. In Oracle Database 11g, Data Pump can compress the dumpfiles while creating them by using parameter COMPRESSION in the expdp command line. The parameter has three options: 

METDATA_ONLY - only the metadata is compressed
DATA_ONLY - only the data is compressed; the metadata is left alone. 
ALL - both the metadata and data are compressed. 
NONE - this is the default; no compression is performed. 

Encryption

The dumpfile can be encrypted while getting created. The encryption uses the same technology as TDE (Transparent Data Encryption) and uses the wallet to store the master key. This encryption occurs on the entire dumpfile, not just on the encrypted columns as it was in the case of Oracle Database 10g. 

Data Masking 

when you import data from production to QA, you may want to make sure sensitive data are altered in such a way that they are not identifiable. Data Pump in Oracle Database 11g enables you do that by creating a masking function and then using that during import.

REMAP_TABLE
Allows you to rename tables during an import operation. 
  
Example
The following is an example of using the REMAP_TABLE parameter to rename the employees table to a new name of emps:
impdp hr DIRECTORY=dpump_dir1 DUMPFILE=expschema.dmp TABLES=hr.employees REMAP_TABLE=hr.employees:emps