DataPump Export using SQL Developer 

Create a DataPump export on the Database Server using SQL Developer from a Client
Note : Although I did not choose the "Export read-consistent view of data" (at 04:00 in the video), I strongly recommend using this option when exporting multiple tables and/or multiple schemas in a database with concurrent transactions while the export is running.
See hemantoracledba.blogspot.com/...

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