Oracle Errors Question:
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ORA-12514: TNS:listener does not currently know of service requested in connect descriptor?

Answer:

Cause: The listener received a request to establish a
connection to a database or other service. The connect
descriptor received by the listener specified a service name
for a service (usually a database service) that either has
not yet dynamically registered with the listener or has not
been statically configured for the listener. This may be a
temporary condition such as after the listener has started,
but before the database instance has registered with the
listener.

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ORA-12515: TNS:listener could not find a handler for this presentation?ORA-12513: TNS:service handler found but it has registered for a different protocol?