OK, Almost everbody who has worked in Oracle would have seen this error message. This is one of most frustrating and most common error
What does "ORA-12154: TNS:could not resolve the connect identifier specified" mean ?
Say from SQLPlus, you are issuing the following command
SQL> Conn scott/tiger@orcldb;
SO, SQLPlus, looks for the entry "orcldb" in your client tnsnames.ora file.
If it cannot find orcldb in tnsnames.ora, then you get ORA-12154: TNS:could not resolve the connect identifier specified
Fix your tnsnames.ora, and you should be fine.
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