The Oracle user password contains special characters, which makes sqlplus unable to log on normally.

Today I encountered a strange problem:

Using sqlplus on the client allows normal users to log on, but neither system nor sys users can log on, prompting ORA-12154: TNS: unable to resolve the specified connection identifier

[@ More @] SQL> conn system @ webdata
Enter the password:
ERROR:
ORA-12154: TNS: Unable to parse the specified connection identifier

SQL> conn xgplat @ webdata
Enter the password:
Connected.

I thought the client was a 32-bit server. I used sqlplus to log on to the Oracle server.

SQL> conn system @ webdata
Enter password:
ERROR:
ORA-12541: TNS: no listener

SQL> conn xgplat @ webdata
Enter password:
Connected.

I asked some people who are confused and confused about the problem. When someone said it was related to the password file, I thought that the password of my system/sys user contains a @ character.

For example, if my password is 123 @ 456, you can use sqlplus to Log On As sqlplus system/123 @ 456 @ webdata, in this way, sqlplus is understood as the connection string of the database after 123. In this way, an error is reported and a prompt is displayed, indicating that the specified connection identifier or no listener cannot be resolved.

After logging on to the server with sqlplus/as sysdba, change the password of sys/system and try again.

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