Export table from one Oracle database and import to another database

Hi,

I have a doubt.

We can export table using expdp utility.

Let us consider that table has primary keys, check constraints, idexes.

This table is already exist in target database.

While importing that table to target database how to avoid any constraint violations etc. And also this source table has indexes, which takes more time to import table to target database.

Could anyone explain me how to solve this kind of scenario?

Thanks,

Chinna