ORA-12154 TNS Could not resolve the service name

Question

I am working on Oracle 9i(Release 2) windows version. I want to change the value of
shared pool size, buffer size and others database parameter through "Enterprise Manager Console" but
when i connect to sysdba mode message comes "ORA-12154 TNS Could not resolve the service name".
How can I solve this problem?

Answer 1

these problem are you getting from OEM?
post
lsnrctl status
lsnrctl services
make sure database is running.. all the services running in services.msc
check error code and start..
ORA-12514:
     TNS:listener does not currently know of service requested in connect descriptor
Cause:      The listener received a request to establish a connection to a database or other service. The connect descriptor received by the listener specified a service name for a service (usually a database service) that either has not yet dynamically registered with the listener or has not been statically configured for the listener. This may be a temporary condition such as after the listener has started, but before the database instance has registered with the listener.
Action:      
- Wait a moment and try to connect a second time.
- Check which services are currently known by the listener by executing: lsnrctl services <listener name>
- Check that the SERVICE_NAME parameter in the connect descriptor of the net service name used specifies a service known by the listener.
- If an easy connect naming connect identifier was used, check that the service name specified is a service known by the listener.
- Check for an event in the listener.log file.