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搜索引擎缓存机制存在的价值

时间:2017.06.20 来源:http://www.weidaoshang.cn

搜索引擎的缓存
Search engine cache
缓存也即cache,是计算机领域非常常用的一种技术,我们最熟悉的,恐怕就是浏览器的缓存。
Caching, also known as cache, is a very common technique in the computer world, and most of all, I'm afraid it's browser caching.
搜索引擎的缓存可以这样简单描述:在高速内存硬件设备开辟一块数据存储区,用来存储搜索用户的查询、索引数据、搜索的中间结果或者最终的搜索结果。缓存的大小是有限度的,不可能无限存储数据。因此搜索引擎会采取缓存更新策略和缓存淘汰策略管理维护缓存区存储的数据。
The search engine cache can be so simple description: open up a data store in high speed memory hardware, query, index data, search the intermediate results used to store the user's search or the final search results. The size of the cache is limited and it is impossible to store data indefinitely. Therefore, the search engine will adopt cache update strategy and cache elimination strategy to manage and maintain the data stored in the cache.
搜索引擎缓存的价值
The value of search engine caching
搜索引擎缓存具有两个价值:一、加快响应搜索用户查询的速度,提高搜索用户体验;二、减少搜索引擎后台的计算量,节省计算资源。
Search engine cache has two values: first, to speed up response search, user query speed, improve search user experience; two, reduce the amount of search engine background, saving computing resources.
搜索引擎的缓存更新策略对提高搜索用户的体验方面起着举足轻重的作用。
The cache update strategy of search engine plays an important role in improving the experience of search users.
不同网站的快照是不一样的,为何会这样?因为每个网站的更新频率和权重互异。即便是用不同关键词去搜索同一个网站,这个网站也会呈现不一样的百度快照。为何?因为搜索引擎的缓存。你搜索“网站优化”这个词所返回的搜索结果,很有可能是搜索引擎直接在缓存区直接调用的结果。因为缓存区中直接匹配到了你的搜索,搜索引擎无需重新计算排序。
Snapshots of different websites are different. Why is that? Because each site updates frequency and weight varies. Even with different keywords to search the same site, the site will also show a different snapshot of Baidu. Why? Because search engines cache. The search results that you search for the term "web optimization" are likely to be the result of a direct call by the search engine directly in the cache. Since the cache matches your search directly, the search engine does not need to recalculate the sorting.
即便你的网站不断有新的更新内容,而且搜索引擎也索引了你网站的最新内容,但当你搜索某些关键词时,你依然只能看到旧的网站内容,因为缓存内容不会随着索引内容发生即时的改变。这种不一致或多或少地影响了用户体验。
Even if your site there have been new updates, and search engine index the latest content of your site, but when you search for certain keywords, you can still see the old website content, because the cache content will not immediately change with content index. This inconsistency has more or less influenced the user experience.
搜索引擎为了让索引内容与缓存内容尽量保持一致,推出了两种缓存更新策略:缓存——索引密切耦合策略;缓存——索引非耦合策略。
In order to keep the index content consistent with the cache content, the search engine has introduced two cache update strategies: cache index close coupling strategy, cache index non coupling strategy.
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