session on database is too large

-- HikaShop version -- : 2.6.4
-- Joomla version -- : 3.6
-- PHP version -- : 7
-- Error-message(debug-mod must be tuned on) -- : none

hi

i got a report from my host that this database is occupying a lot of space

when i explored the database it seems to be a record of the last item viewed.

i attached a screen shot

how can i trim this database?

can i delete the content of xxx_session ?

thanks