How to export large amount of data using sql developer - Oracle

Question

I want to upload some data from UAT DB to DEV DB. When I try to do this from Export function in SQL Developer, I got an error File C

Answer 1

1-You can create a database link (db link) on DEV DB pointing to UAT DB, to INSERT rows in DEV DB.

2-Or you can build in PL/SQL a procedure in UAT DB to export data to a file in CSV format and in DEV DB use oracle external tables to SELECT from that files.
Be carefull about DATE acolumns, write down using TO_CHAR.

3-Use Datapump to export data from UAT DB and then import into DEV DB; it's a bit tricky.