Copying tables from one DB to another via database link

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You do not need to restart the database to fix your problem. But you must correctly configure your TNSNAMES.ORA file. One thing that people don't understand about database links is that it will only look in $ORACLE_HOME/network/admin for a TNSNAMES.ORA file. And this file must reside on the server that the database is running! So correctly configure this file in this location for your database links. I always test database links by issuing the following query:

SELECT sysdate FROM dual@remotedb;

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