ORA-12500: TNS:listener failed to start a dedicated

admin

ORA-12500: TNS:listener failed to start a dedicated server process
Cause: The process ofstarting up a dedicated server process failed. The
executable could not be found or the environment may be set up incorrectly.
Action: Turn on tracing atthe ADMIN level and reexecute the operation. Verify
that the ORACLE Server executable is present and has execute permissions
enabled. Ensure that the ORACLE environment is specified correctly in
LISTENER.ORA. The Oracle Protocol Adapter that is being called may not be
installed on the local hard drive. Please check that the correct ProtocolAdapter are
successfully linked. If error persists, contact Oracle Customer Support.