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Transcript of Google
- Pratik Jain
Google…
What Google Search Results look like…
• URL, size, date last crawled
• Cached link
• Pages like this one
Database Google Used
Approximate # of hits
Ads selected by Google based on you search
terms
Search terms are in bold
How Google
Works
Search is Mostly Invisible
user interface
Like an iceberg,2/3 below water
search functionalitycontent
What happens when you Google?
COMPONENTS
Googlebot, Google’s
Web Crawler
Google’s Query
Processor
Google’s Indexer
Googlebot…
• An automated program that accesses a web site, goes through the site following the links,sends data back.
• It consists of many computers.
• It can request thousands of different pages simultaneously
• A web crawling robot.
• A little spider scurrying across the strands of cyberspace.
Google’s Indexer…
• It processes crawled web pages into a database and then analyses them efficiently and quickly.
• It will look at the data on each page using various indexing techniques to
• Manipulate,
• Analyse,
• Understand the meaning,
• Mark the page up in a number of ways for storage in the database.
Simple Index Diagram
Google’s Query Processor…
A Query - a request for information from a search engine.
Google uses more than 200 signals, including the PageRank™* algorithm,
To examine the entire link structure of the web and determine which pages are most important. Google puts the most relevant
and reliable results first
By combining overall importance and query specific relevance
Runs on a distributed network of 1000’s of low-cost computers Thus carrys out fast parallel processing.
Do you know where google actually runs ?
Parallel processing-
• Simultaneous use of more than one processor core to execute a program or multiple computational threads.
• Speeds up data processing.
Thank you