You may also be interested in some similar software, the WWW News . About the search engine. All words, with the exception of short and some common words, are indexed by a highly optimized gdbm-based indexer. Partial word searches are not implemented, and all searches are case insensitive and strictly alphanumeric. Searches are parsed using a right associative parser that generates lists of articles from the index.
Parse errors are more or less ignored.
The browsing feature is implemented with a fixed-string search of the database. About Entring Ads. Ads are indexed and stored in a linear database. A maintenance program deletes old ads after a fixed period of time, tentatively 1.2 Million seconds or roughly two weeks. It is possible to extend an ad if it is not deleted or if the delete procedure was not able to remove references from the database due to some error.