Hi,
that's not an error.Its a common problem when database servers have heavy load.
Rajaram Shyamala shyamala@netlinkindia.com wrote: Unable to connect to database server If you still have to install Drupal, proceed to the installation page. If you have already finished installing Drupal, this either means that the username and password information in your settings.php file is incorrect or that we can't connect to the MySQL database server. This could mean your hosting provider's database server is down. The MySQL error was: Too many connections. Currently, the username is drupal and the database server is masterdb-drupal.drupal.org.
Are you sure you have the correct username and password? Are you sure that you have typed the correct hostname? Are you sure that the database server is running? For more help, see the Installation and upgrading handbook. If you are unsure what these terms mean you should probably contact your hosting provider.
Shyamala