
Brief Profile:
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Overview
Google is a "popularity" engine and ranks records in its very large database
based on their popularity, i.e., the degree to which other pages (especially
other popular pages) refer (link) to a page. Google very quickly achieved
a widespread popularity of its own due to the effectiveness of this ranking
method--- and the extreme simplicity of the search interface. In
June, 2000, Google claimed the title of "largest," with 560 million fully
indexed records and another 500 million partially indexed records.
Searching options are very limited, with no truncation, negligible field
searching, no case sensitivity, etc. Google retrieves records based
on an ANDing of all terms and ranks the output by primarily by popularity,
but with some consideration for the proximity of search terms within the
record.. Google makes use of Open Directory and includes matching
Open Directory records automatically in search output, but unlike other
search engines, ranks the Open Directory content based upon Google’s measure
of popularity. Google's output is unique among the major search engines
in that it allows you to go to the page as it is currently on the Web,
or to go to a "cached" copy which Google stored when it retrieved the page.
Google contains about 1 billion records, half of them fully indexed.

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Strengths
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Weaknesses
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Very useful if you need "popular" pages
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The "popularity" approach can quickly lead to very relevant records.
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"Cached" option in Google's output is sometimes useful for finding slightly
earlier versions of a page.
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Colorful logo
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Pretty limited search functionality
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On Google's home page you'll find:
Query box - Enter one or more words. You can use a minus
sign to eliminate a term and quotation marks for phrases. Google will ignore
small, very common words unless you insert a plus sign in front of them.
Language Window - Choose records in French, German, Italian,
Swedish, Finnish, Spanish, Portuguese, Dutch, Norwegian, or Danish.
Preferences Link (Language, Display & Filtering Options)
his leads to a preferences page where:
- You can choose to display search tips, help screens and messages
in French, German, Italian, Swedish, Finnish, Spanish, Portuguese, Dutch,
Norwegian, or Danish and/or to retrieve only pages written in those languages.
- You are given the option os seeing 10, 20, 30, 50, or 100 records
per page of results.
-Turn filtering on or off
Google Search option - If you click this after entering terms
in the query box, your search will be executed. If you click it with
nothing in the query box, it leads to a page almost identical to the home
page, except that i
"I'm feeling lucky" - Will automatically take you to the page
that Google would have listed first in your results. If you're really
lucky, it works.
"Advanced Search" - Takes you to Google's Advanced Search page
"About Google" - Takes you to a choice of help and information
screens.
"Google Web Directory" - Google's implemtemtation of Open Directory.
"Google Buttons" - This will lead you through the process
of placing a Google Search button on the personal toolbar of your browser.
With this, by highlighting a word or phrase on any page your are viewing
and then clicking the button, a Google search will be performed.
Search Features Provided by Google (Home Page)
Phrases
To search for a phrase, use quotation marks.
Example: "sleep disorders"
Boolean
Google automatically "ANDs" all of your words.
To "NOT" a term, put a minus in front of it
Example: graphics -clipart
You can use a plus, but it is unnecessary, since Google "ANDs" all
of your words anyway.
The plus is useful if you have a very common word which Google
treats as a stopword and you want to search it anyway. Google indexes
all words, but ignores common words in search queries unless you use the
plus.
Google has recently introduded an OR option. To look for treaties
signed in Paris, but not the 1783 treaty, you could use:
paris treaty OR treaties -1783
Google recommends (using its example) that you search for Episode
I using Episode +I
For most searches of this type, however, it seems that searching
for it as a phrase, "Episode I", makes more sense, seems to produce the
same results and is more consistent with how you would search for that
in almost all other search engines.
Field Searching
Title
allintitle:
Example:
allintitle:cornwall
Title can be more easily searched using Google's Advanced version
and seleinging the title option in the Occurences box.
URL
allinurl:
Example:
allinurl:cam.ac.uk
URL can be more easily searched using Google's Advanced version
and selecting the URLoption in the Occurences box.
Site
(Host)
term
site:url
Example:
training site:onstrat.com
This will retrieve sites from a particular host. It seems
that you cannot use the site: part alone, but must combine it with
another term. The above example will retrieve pages from the Online Strategies
site which include the word "training". It will work on adjoining
parts of a url (tradoc.army.mil, army.mil), but you must have at least
the domain (.com, .org, .mil, etc.) included for it to work.
Link.
link:url/
Example:
link:www.onstrat.com/
Similar to the link: in several other search engines, this will
allow you to locate pages which link to a particular page. The example
above will produce a list of pages which contain a link to the Online
Strategies home page (www.onstrat.com).
Language - Use the language window on the home page and choose
from French, German, Italian, Swedish, Finnish, Spanish, Portuguese, Dutch,
Norwegian, or Danish. The "language options" link just below the
window allows you to set your preferences so that help screen and other
messages are in one of these languages.
Truncation
Google does not provide any form of truncation.
Advanced Search Page
This page, introduced in July, 2000, provides easier (more obvious) access
to functions which were already present on the home page and preferences
(Language, Display & Filtering Options) page.
You can:
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Select to search by word or phrase from a pull-down window
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Exclude ("NOT") words or phrases from your search
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Limit results to any one of 14 languages
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Specify 10, 20, 30, 50, or 100 results per page
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Find pages which link to a particular page
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Find pages which are similar to a particular page
It does also provide links to the several specialized databases which Google
has created (Apple Macintosh, Linux, University Searches, BSD Operating
System, US Government). Note that these are subsets of the main database.
Output
On the home page, if you click "Google Search," you'll be taken to
an almost identical page that allows you to choose:
10,
30, or 100 results per page
Google ranks output by popularity and by the proximity of your search
terms within the record." Google's output is interesting in that
it allows you to go to the page as it is currently on the Web, or to
go to a "cached" copy which Google stored when it retrieved the page.
Google automatically searches Open Directory as well as the Google
Web database. If there are matches within the Open Directory, you
will find a link to the category at the top of the Google results page,
"Categories". Google has searched not only the directory headings,
but the page descriptions within that category. Categories are listed
according to popularity of the matching page, as with Google Web results.
In results records, Google provides:
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Retrieved pages grouped by host. For example, pages from the Britannica.com
site will be shown together. After the top-ranked page from the site, the
records for the other pages will be indented.
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An excerpt of text surrounding your search term ("KWIC" for the cognoscenti)
with
your query terms highlighted
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The URL
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"Show matches (Cache)" A link to the cached copy, which Google stored when
the record was found by Google (This can be useful when you look
at the current page, don't find your term and want to see the original.
It also is handy if the current page is not available at the moment.) This
also causes matching terms within the actual Web page results to be highlighted.
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Page size
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"Similar pages" (formerly Google Scout link). Clicking on this will
lead to similar pages (pages with content words, etc. similar to the original
record.)
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"More from ...." Additional pages from this site (but which do not
necessarily contain your query terms.)
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When you submit a query, Google now also searches the RealNames database
of company and product names, slogans, etc. If it finds a match,
a link (identified with the RN superscript) will be shown.
Once you are on a results page, you have the option of choosing 10,
30, or 100 results per page.
At the top of results pages, you'll find an "Email These Results" link,
which will allow you to easily email the results to others.
The "Language options " link allows you to set your language options
from the results page
You also will see "SafeSearch is Off" - This is an adult content filter
option and by clicking this link you can turn it on.
Directory
Google provides a link to Open Directory. When you do a search
on Google, it also searches Open Directory. If there are matches
within Open Directory, you will find a link to the categories at the top
of the Google results page, under "Relevant Categories". Google has searched
not only the directory headings, but the page descriptions within that
category.
Summary
Keep in mind that Google is a "popularity" engine. The high relevance
this can produce has quickly led to Google's widespread use. It now has
a database size which puts it up there with the largest engines, which
means that it is also good for finding some more obscure items. The
"cached" page option in output may be useful when tracking down pages that
don't exist anymore. Give this engine a try and see if it works for you.
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