hi
i create db_link using syntax

create database link <link_name>
connect to <username> identified by <pwd>
using <'service_name'>;

when i issue a command like
select * from <able_name>@<link_name>;

i get this error
....TNS: could not resolve service name....
how can i fix this ...do i have to change something on INIT.ORA and TNSNAME.ORA????????

thanks