Oracle Database Discussions

I have few questions

1) to do schema refresh if we drop target schema and import the schema from source does all the grants on the schema and other stuff like PK, FK constraints enable by themselves? what should be taken care while doing whole schema refresh.

2) how can i do selective tables refresh which are in source and target. can i keep the tables as it is and refresh the tables. If so if the table structure is changed in the source does it is effected in target. how can i do tables refresh including data and code.


Please help me........