In my application I have an inbox. If a new message arrives I need to increment the unread count. Do I need to make the database connection for every second to find out if a new message has arrived? Are there any other methods?
                +4 
                A: 
                
                
              Use Comet, and load the changes when new mail comes in.
                  Ignacio Vazquez-Abrams
                   2010-03-26 06:32:47
                
              Thaks for your quick response ...I will try and let you know the feedback..
                  vinothkumar
                   2010-03-26 06:50:25
                
                +2 
                A: 
                
                
              
            Comet is the name given to various types of "server-push" methods that can be used to do what you are looking for. The most compatible of the comet methods is XHR Long Polling.
If you want to try out a specific comet tool, check out jquery comet, which was developed by a SO member. He discusses his plugin at another question.
                  Anthony
                   2010-03-26 06:47:10