Search Guidelines

COLLECTED BY

Organization: Internet Archive

The Internet Archive discovers and captures web pages through many different web crawls. At any given time several distinct crawls are running, some for months, and some every day or longer. View the web archive through the Wayback Machine.

Collection: Wide Crawl started March 2011

Web wide crawl with initial seedlist and crawler configuration from March 2011. This uses the new HQ software for distributed crawling by Kenji Nagahashi.

What’s in the data set:

Crawl start date: 09 March, 2011
Crawl end date: 23 December, 2011
Number of captures: 2,713,676,341
Number of unique URLs: 2,273,840,159
Number of hosts: 29,032,069

The seed list for this crawl was a list of Alexa’s top 1 million web sites, retrieved close to the crawl start date. We used Heritrix (3.1.1-SNAPSHOT) crawler software and respected robots.txt directives. The scope of the crawl was not limited except for a few manually excluded sites.

However this was a somewhat experimental crawl for us, as we were using newly minted software to feed URLs to the crawlers, and we know there were some operational issues with it. For example, in many cases we may not have crawled all of the embedded and linked objects in a page since the URLs for these resources were added into queues that quickly grew bigger than the intended size of the crawl (and therefore we never got to them). We also included repeated crawls of some Argentinian government sites, so looking at results by country will be somewhat skewed.

We have made many changes to how we do these wide crawls since this particular example, but we wanted to make the data available “warts and all” for people to experiment with. We have also done some further analysis of the content.

If you would like access to this set of crawl data, please contact us at info at archive dot org and let us know who you are and what you’re hoping to do with it. We may not be able to say “yes” to all requests, since we’re just figuring out whether this is a good idea, but everyone will be considered.

TIMESTAMPS

The Wayback Machine - https://web.archive.org/web/20110722111135/http://www.doi.org/search.html

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		Home > Search Guidelines Search Guidelines DOI Web Site Search includes HTML and PDF documents found on this site. Note: This search excludes documents in the Members Only section of the site. Quick Search Tips Match: Matching can be set so that your search results match All of the terms in your string (Journal Article will find both words in any order), Any of the terms (Journal Article Metadata will find any of those words), or two or more terms combined with Boolean logic ((Journal and Article) not Metadata). Format: Long will list the titles, plus an excerpt showing the search string in its context, from either the contents of the <META> tag, an extract of text containing the search word, or the initial text on the page. Short will display only a list of titles. Sort: Sort by Score will list results in rank order, Time will list results order by date they were last updated, and Title will list results alphabetically. The sort orders may be reversed. The search is case-insensitive, so identical results will be found for "doi" or "DOI". The search facility gives each page a one to five (star) rating. The present version of the search engine software only allows for searching on words rather than complete phrases. If you enter "DOI Discussion Paper", the search will return all pages containing all three words, in any order. Searching on *"Discuss" will return "Discussion" and any other words beginning with "Discuss". Quotes are ignored. Search engine by ht://Dig**. Updated 16 December 2009