We are trying to move to a new virtualized server. The System Admin installed the recommended MySQL 5.1. Now the sorting arrows in the list view header in one of the custom modules doesn't work. The current server we are using uses MySQL 5.5 and the sort functionality works just find there.
It mentions MySQL recommendations twice. The first time it says MySQL 5.1 and 5.5 are both supported, but later it says MySQL 5.1 is preferred.
What is the difference between MySQL 5.1 and MySQL 5.5?
NOTE: Previously the title was incorrectly saying MySQL 5.1.