reinstall mysql

Hello, I installed MySql serevr version 3.23.33 on Red Hat Linux 7.0. Sometimes when I reboot the system, MySql do not work. I have to uninstall and then reinstall MySql server. What could be the problem? Rashid -

Error code 13

Hello, I copy a database "demo" from one server to another. The file types are the same as other databases that exist in the destination server. I stopped and restarted mysql server. When I try to use that database using the command "use demo" it gives me the following error "Error