当用户在注销后点击后退按钮，如银行网站时，会话如何到期

I am storing session id in database at the time of login and refer the same when different pages are accessed. Session expires after a certain time as I have calculated for session id in each page. Now, My problem is in log out. When I click log out, it works in a way that user if select any thing from menu gets session expired. But if he clicks back button, it takes him to previous page, as session never logged out/expired. How to prevent this page display on back button thing?I am storing session id in database at the time