Problem with the dblink command

I am working with the dblink command. i have connected to a remote machine which i have configured in my TNS names under the name 'miracle'. so now i have created a dblink to that m/c as:
create database link data_link connect to scott identified by tiger using 'miracle';
where scott/tiger is the schema on the remote machine.
now i am accessing a table 'X' on the remote m/c as:
select * from X@miracle;
but i am getting an error saying:
select * from x@miracle
ERROR at line 1:
ORA-02019: connection description for remote database not found
somebody please help me.

Also, is the source database (from where you are running the select statement), installed on the machine where you updated the tnsnames entry?
If you change your local tnsnames it will not work. you need to change the tnsnames entry on the Orcle home where the database server is installed.

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