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Don Burleson Blog 







Fix a broken Oracle db link

Oracle Database Tips by Donald BurlesonSeptember 3, 2015

Question: I have an Oracle db link problem. I created the database link but it does not work.

Answer: Diagnosing a db link in Oracle is tricky, since Oracle connects directly to the remote database using the TNS service name, user ID and password that you provide. I start diagnosing db links problems from the top-down, one step at a time:
1 - Ping the server
2 - tnsping the server
3 - test TNS at sqlplus: sqlplus scott/tiger@mydb
4 - test inside sqlplus: select * from v$database@mydb
I have more complete notes here on debugging Oracle network links.
Also see here for more on fixing db-links oin Oracle:



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