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An extension of Apache Nutch, a powerful and popular general purpose search engine Arch is an extension of Apache Nutch, a powerful and popular general purpose search engine that is capable of indexing billions of web pages using clusters of computers. Arch uses Nutch software and adds additional features to provide a powerful and efficient search engine that is optimized for use in corporate web environments. Such environments typically have one or more web sites, with web content provided for external readers and internal use, and one or more "intranet" sites that provide content for internal use only. Arch can be used to search both the external access and restricted access sites and produces extremely high quality search results. Motivation Corporate web environments are a challenging area for modern search engines. Whilst they may include multiple web sites and millions of pages, compared to the global Web they are much smaller and this makes them easier to index. However, the smaller scale of corporate environments and the more restricted access to information also makes it harder to estimate the relative importance of documents, images or other information found in search queries. The search methods used to search the global Web generally do not work well on a smaller scale and this leads to frustration for companies who often find that searches on their intranets are of limited use Arch has been specifically designed to provide very high quality searches for corporate web environments and their intranets. Arch makes use of web server logs and other information that is available within an organization, but not available to external search engines, to provide excellent search results. It is robust and easy for a webmaster to install and maintain, and is extremely efficient at providing relevant and up-to-date information. Arch Features * Excellent search quality: Arch has solved the problem of providing good search results for corporate web sites and intranets! * Up to date information: Arch is very efficient at updating indexes and this ensures that the search results are up to date and relevant. Unlike most search engines, no complete 'recrawls' are done. The indexes can be updated daily, with new pages discovered automatically. * Multiple web sites: Arch supports easy dynamic inclusion or removal of websites. * "Setup and forget": Arch can be installed by one person with limited webmaster experience. Once it has been installed, it requires little effort to maintain. * 24/7 availability: Arch uses two indexes so that the search engine always has a working index. All crawling is done to a new index and switching to the new index happens only when the crawling has been completed. * Document level security Arch is easy to configure and can be set up so that some parts are restricted to different users. Users can find only documents that they have a permission to see - a must in corporate environment. * Customization:. Arch can be customized to specific requirements using either Java or PHP.

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