javascript - notification to the user when a table in the database change -

i'm using spring project , need best solution problem, because affect performance system. better using javascript or create method on java ?

from web server:

1. poll database, , check new data
2. or listen notifications database. preferred method. you'd need postgresql or oracle though

from web browser:

1. reload page using refresh header (don't this)
2. poll server using ajax
3. use comet
4. use server-sent events. lightest weight.
5. use websocket

here's how spring, postgresql, , websocket: http://blog.databasepatterns.com/2014/04/postgresql-nofify-websocket-spring-mvc.html