Recent Items Disappeared

Recent Items Disappeared

Hi All;
         I have manageengine service desk plus build 9010 and after tunning performace on

https://www.manageengine.com/products/service-desk/help/adminguide/general-features/performance-guide.html#i

Now Recent Items list is empty when i search on any machine or working on any tickets ; history should be appeared in the recent item .Could you please help me to cover that issue?!