The conceps of Google Indexing ( Definition, How it works, etc).

1. Submitted By:
Mohd. Tahoor Shamsi

2.  Indexing is the process of creating indexes for record
collections.
 Google index is the place where all the data the Google
has collected is stored.
 Google Indexing is process of a Google collecting, parses
and stores data for use by Google.

3.  The purpose of storing a index is to optimise speed and
performance in finding relevant documents for a search
query.
 Without the index Google would scan every document in
the corpus, which would require considerable time and
computing power.

5. Major factors in designing a search engine's architecture
include:
Merge Factors : How data enters the index, or how
words or subject features are added to the index during
text corpus traversal, and whether multiple indexers can
work asynchronously. The indexer must first check
whether it is updating old content or adding new content.
Traversal typically correlates to the data collection policy.
Search engine index merging is similar in concept to
the SQL Merge command and other merge algorithms

6.  Storage Techniques: How to store the index data, that is,
whether information should be data compressed or filtered.
Index size: How much computer storage is required to
support the index.
Lookup speed How quickly a word can be found in
the Inverted index. The speed of finding an entry in a data
structure, compared with how quickly it can be updated or
removed, is a central focus of computer science.

7.  Maintenance: How the index is maintained over
time.
Fault tolerance How important it is for the service to
be reliable. Issues include dealing with index
corruption, determining whether bad data can be
treated in isolation, dealing with bad
hardware, partitioning, and schemes such as hash
based or composite partitioning, as well as replication.

8.  A web search engine is a software system that is designed
to search for information on the World Wide.
 These pages are retrieved by a web crawler An automated
web browser which follows every link it sees.
 Another program, called an indexer, then reads these
documents and creates an Index based on the words
contained in each document.
The contents of each page are then analyzed to determine
how it should be indexed.

9.  Each search engine uses a proprietary algorithm to create
its indices such that, ideally, only meaningful results are
returned for each Query.

10. A User enters a query in to a search engine, the
Engine examines its index and provides a listing
of best matching web pages according to criteria,
Usually with a short summary containing the
Document’s title.

12.  Google’s advanced search web form gives several
additional fields which may used to qualify searches by
search criteria as date of first retrieval.
 All advanced queries transform to regular queries, usually
with additional qualified term.
 Google's search engine normally accepts queries as a
simple text, and breaks up the user's text into a sequence of
search terms, which will usually be words that are to occur in
the results, but one can also use Boolean operators, such as:
quotations marks (") for a phrase, a prefix such as "+" , "-" for
qualified terms or one of several advanced operators, such as
"site:"

13.  Search engine optimization (SEO) is the process of
affecting the visibility of a website or a web page in a search
engine's "natural" or un-paid ("organic") search results.
 It is the process of improving the volume and quality of
traffic to a website from search engines via results.
 Higher a site’s “page rank”, the more visitors it will receive
from the search engine.

15.  Introduction to Google Indexing book by Google Blog.
 Wikipedia.
 Slide Share.
 Google Blog.