Since Sun Microsystems buy MySQL (then Oracle Corporation buy Sun), for MySQL it was time of big changes. It was a time when great changes was made and MySQL has grown and … something goes wrong.
ProxySQL is a very powerful tool for the MySQL database. In simple words, it can tweak your MySQL when you have problems with slow queries or even it can be some kind of bridge between your MySQL databases placed in different localizations. Like in the name, it is a proxy, it’s placed between MySQL and application.