How to implement Live notification using PHP, MYSQL, AJAX?

I am developing a monitoring tool, it has a shift handover process.

1. When the current custom clock strike deletes the hanover button, it asks for the name of the person by changing gear 2. Then the entry is added to the mysql table (the handover request table).

here php should notify user who has request in database, this is possible with given AJAX interval, but I want when request is in DATABASE to be notified on UI (by session name) please suggest codes or ideas