Need module for notifications like privatemsg I am using Drupal7 and notification module. Now i want the notification like Private Message module. When any comment occurs or any post occurs at that time i want notification like "Private Message" module i.e. just like "3 new messages" i want same like this "3 new comments" etc..

Can you please inform me if there is any module exists or not
There is messaging_simple  table which stores message values.

See the column timeread this provides time when the message is read. The entries which have 0 value shows unread message.

You can apply sql query to find out rows with timeread 0 for logged in user and can get the count of unread messages.