I just made my PC server slave where I have the app uploaded to get the mysql data when they are updated on the server. My query is the following, because although I did not understand it well, this consumes many resources of my pc? Are you constantly listening to the server to keep mysql updated? The operation is similar to a socket? And my other query, a slave pc can be master at the same time? Ex my server is master, my pc slave of that master and another pc is a slave of my pc to chain the updates