Wordpress database error (again and again)

I used quick wordpress install (Application > Wordpress on Ubuntu 13.10) Then I used Wp Super cache plugin for caching. When I get huge traffic I got “database error”. Then I researched and found swapping. ( After swapped, everything was fine but today, when I get more traffic again I got “database error” again. I dont know what will I need to do. Can anyone help me?

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How big is your droplet? 512MB is usually not enough for a moderately active site running Apache (which is what the 1-click image uses). <br> <br>You can either upgrade your droplet, or dump Apache in favor of nginx: <a href=“”>How To Install Wordpress, Nginx, PHP, and Varnish on Ubuntu 12.04</a>.