Security Management - Oracle 10g/11g Data and Database Management Utilities - page 256

A parameter file should be specified instead of the command line
when the ENCRYPTION_PASSWORD parameter is used.

Dump File

ENCRYPTION_PASSWORD

Datapump
Export

Encrypted TDE
Columns

TDE Based Data

No Password Used

Clear Text
Warning

When using this option, you should consider the following:

• When you perform a data pump export against TDE data, the export will be
performed, but a warning will be displayed letting know the user that TDE
data will be written in clear text format
• ENCRYPTION_PASSWORD applies only to TDE data, not to the entire dump file
• The ENCRYPTION_PASSWORD parameter is neither supported with external
tables nor in network mode

The enterprise user
Managing users means the administrator will have to enrol the real user to the
systems the user is authorized to access. From the user's perspective we have
a single physical user who is required to log in to the different systems this user has
been granted to, and who is not willing to be authenticated against each system.
If the user was authenticated against each single system, sooner or later the system
administrator would have a hard time trying to manage the community with a non
scalable solution as either the number of users, or systems or both number of users
and systems, increases.