Easiest way of transfering data among 2 databases

Hello Guys,
I just want to know the easiest and reliable way to shif data from a database to another database running on a different machine.
Database (Machine A) TO Database (Machine B)
Where Machine B already contains some of the data of Machine A but not all.
Regards,
Imran Baig

If you can overwrite your data without causing a problem, 2 ways are available. You can use transportable tablespaces or do a sqlplus copy between the tables. It depends on how much data you are talking about.
You don't mention the version of oracle you are using, but data dump is also an option.

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