The search tool can become the central interface though which visitors find information on your site - supplanting the need for extensive hand-crafted site sections and navigation menus and improving the user experience by letting them quickly find what they are looking for following a pattern that is natural to them. Unfortunately, a SQL database is not optimized to provide these sorts of features, so solutions built totally within the PHP/SQL framework have difficulty performing well for large sites or for multi-sites search. Indexing the data from site content with Apache Solr allows you to offload the computational effort and optimization to a separate server. We will show how Drupal integrates with Solr and how a search integrating content from both groups.drupal.or and drupal.org could look.
