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Cannot connect to database

Hello All,
I'm new to Oracle Database.
I changed the password for sys user using
alter user SYS identified by "[email protected]"
and tried to connect using the following command
sqlplus /nolog
SQL> connect sys as sysdba
Enter password:
ERROR:
ORA-12154: TNS:could not resolve the connect identifier specified
SQL>
how can I solve this error ?
Thanks & Regards
Comments
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*** moderation ***
This post of yours is not an "IDEA", yet that is the sort of post that you have created.
You are posting a question that describes some sort of issue you see and are asking for help.
Therefore this post does not belong in the "Idea" section. It will be deleted.
If you need to request help with an issue, then start a discussion on your topic. By default, it will be toggled as a question and people will be able to respond with guidance. Be sure to post it into the proper discussion space for whatever software you are dealing with.