Oracle Errors Question:
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ORA-12502: TNS:listener received no CONNECT_DATA from client?

Answer:

Cause: No CONNECT_DATA was passed to the listener.

Action: Check that the service name resolved from
TNSNAMES.ORA has the CONNECT_DATA component of the connect
descriptor.

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ORA-12504: TNS:listener was not given the SID in CONNECT_DATA?ORA-12521: TNS:listener does not currently know of instance requested in connect descriptor?