Today the lecture told us the importance of the portfolio which is 80 percent of the course. Whereas the key is the Comparison and analysis of effectiveness of search facilities which already consist of 30 percent of the portfolio.
Let's talk about directory. Directory are human compiled meaning you might get less research you want through this engine.
Today, we started to learn about database. As the test is coming out soon, I shall post what is databass in this blog so as for those taking this subject will be able to see this and kept it in their mind.
Database are text pages, files or other often high-quality authoritative information available via the world wide web that general-purpose search engine cannot (due to technical limitaions), or will not (due to deliberate choice) add to their indices of web pages.
Database which are call invisible web are also know as deep web. Database informations usually comes from companies, newspaper, research paper and government and many more. The source of the informations are very wide but it is not free.
One bad things is that search engine cannot access to database but some company supply you with the search from the website just like the school http//spark.tp.edu.sg which has a search engine itself but not searchable by internet search engine.
Other example of Database which compile information for use are Lexis-Nexis or Ebsco. Each one is 1 company and are marketed by their own business source which has a gateway and some of these might have entry to all the database.
Tuesday, January 13, 2009
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