To import system objects from a full database export file, the IMP_FULL_DATABASE role must be enabled. The parameter FULL specifies that the following system objects are included in the import:
Profiles
Public database links
Public synonyms
Roles
Rollback segment definitions
Resource costs
Foreign function libraries
Context objects
System procedural objects
System audit options
System privileges
Tablespace definitions
Tablespace quotas
User definitions
Directory aliases
System event triggers