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数据库规模
Spider级别
Meta Tag
支持
帧页支持
图像地图支持
Alt 标签支持
HTML 声明支持
Url 搜索功能
嵌入目录
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约1亿2千5百万
Url
深
Yes
Yes
Yes
Yes
No
Yes
Yes |
登录原理
Alta Vista 拒绝以下几种登录：
- 周期性的反复登录
- Meta 标签中包含与网页无关的关键字
- 多种首页登录
- 企图欺骗Spider
Alta Vista 的spider是一个深层搜索
spider，可以索引整个网站的页面，
除了CGI页面。
Alta Vista 使用
meta 关键字及描述标签，关键字标签有助于提高网页
的相关性。请参考下例（按Web
Design north Idaho搜索）：
网站描述直接来自于meta的描述标签，描述可达150个字符，如果你
的网页上没有meta标签，.
Alta Vista 会从网页文本中提出，请参考下例：
- 13. Sydney
Morning Herald - I.T. - Columns
- NET RESOURCES.
Tuesday, August 12, 1997. HOTMAIL www.hotmail.com
If you're one of those people who jump from computer to computer and
subsequently find it.
URL: www.smh.com.au/computers/content/970812/...s/columns5.html
Last modified 28-Apr-99 - page size 6K - in English [ Translate ]
排名规则
How does
AltaVista determine which site comes up first in the search results?
AltaVista
uses a ranking algorithm to determine the order in which matching
documents are returned on the results page. Each document gets a grade
based on how many of the search terms it contains, where the words are
in the document, and how close to each other they are. Repeating a word
over and over in a Web page, known as "spamming," has a
negative effect on a site's ranking. As soon as it is discovered by
software programmed specifically to detect spamming, the offending site
is prevented from appearing in the AltaVista index.
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