Oracle SQLCL 18.2:

The TNSPING utility in the SQLCL 18.2 tool determines if the listener of service in an Oracle network can be successfully reached.

If the connection between a client and a server (or between servers) can be successfully established with the TNSPING utility, the full time (in milliseconds) it is expected to take to access the Oracle web service will appear.

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If it cannot, a message will appear where you can see the reason for the error. This way, you can see the network error that has occurred without having to be connected to a database.

Use the following command to verify connectivity:

tnsping

Where the address is a TNS entry or a JDBC connection string.

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For example:

TNSPING [email protected]

or

TNSPING localhost: 1521 / test

SQL> tnsping 10.10.4.2:1521/test
ping: 18ms

SQL> tnsping 10.10.4.2:1521:test1
ORA-12505, TNS: listener does not currently know of SID given in connect descriptor
ping: -1ms
SQL>

It means if you are using exact and perfect code then you can not get any issue during establishing the connection.

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