2. Explain that the database is already running; Invalid service name means that the command entered is incorrect; "Unable to start the database service" means that the database file is damaged or the database service cannot be started for other reasons.
If you can't get through, there are generally two reasons. One reason is the problem of OS or network or firewall; Another reason is that MyQLD itself does not listen to the client's connection request at all. After MyQLD is started, there are three ways to monitor the client.
4. Database authorization error. When connecting to the database, you may need to verify the user's permissions. If the authorization is wrong or there is no corresponding authorization, you will not be able to connect to the database. Database maintenance error. Tax Ukey login may fail if the tax bureau database is being maintained or fails.