CodePudding user response:
Up sqlplus logged in to check on the server database under the current status:The select instance_name, status from v $instance;
CodePudding user response:
According to the database is open stateCodePudding user response:
If is open state,1, the server-side LSNRCTL status, see database service registry is normal;
2, the client see you PLSQL dev connection configuration, if you use the tnsnames. Ora, see next tnsnames. Ora, see if with the server-side configuration is consistent,