Re: Memory usage on Ubuntu Desktop 12.04 64 bits
Neither do we First of all it's totally not clear what you mean by 'stop work'. No access? Slow? Corrupted data? What type of site? Some static html pages? Dynamic content with a database behind it? Which database (mysql or something else)? Which webserver (apache or something else)? Have you coded your site yourself from scratch (not really applicable if it's a static site)?
What does top say? Any process that use extreme processing power? You can sort the processes by CPU usage by pressing capital P and by memory usage by pressing capital M.
If you don't make backups of your important data, your data is obviously not important to you.