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EL Online - IIT Bombay
//C|/Documents%20and%20Settings/iitkrana1/My%20Documents/Google%20Talk%20Received%20Files/ist_data/lecture1/main.html[6/14/2012
3:12:20
Course Name Indexing and Searching Techniques in Databases
Department of Computer Science and Engineering
InstructorDr. Arnab Bhattacharya
http://www.cse.iitk.ac.in/users/arnabb/http://www.cse.iitk.ac.in/users/arnabb/
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ctives_template
/C|/Documents%20and%20Settings/iitkrana1/My%20Documents/Google%20Talk%20Received%20Files/ist_data/lecture1/1_2.htm[6/14/2012
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Module 1: Basics and BackgroundLecture 1: Basic Database
Queries
General setting
Database of objects
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ctives_template
/C|/Documents%20and%20Settings/iitkrana1/My%20Documents/Google%20Talk%20Received%20Files/ist_data/lecture1/1_3.htm[6/14/2012
3:12:21 PM]
Module 1: Basics and BackgroundLecture 1: Basic Database
Queries
General setting
Database of objects
Each object has dimensions
No particular database design assumed
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ctives_template
/C|/Documents%20and%20Settings/iitkrana1/My%20Documents/Google%20Talk%20Received%20Files/ist_data/lecture1/1_4.htm[6/14/2012
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Module 1: Basics and BackgroundLecture 1: Basic Database
Queries
General setting
Database of objects
Each object has dimensions
No particular database design assumed
Query is an object with the same dimensions
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ctives_template
/C|/Documents%20and%20Settings/iitkrana1/My%20Documents/Google%20Talk%20Received%20Files/ist_data/lecture1/1_5.htm[6/14/2012
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Module 1: Basics and BackgroundLecture 1: Basic Database
Queries
Exact match query or Point query
Point query: Given and , return all objects such that
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ctives_template
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3:12:21 PM]
Module 1: Basics and BackgroundLecture 1: Basic Database
Queries
Exact match query or Point query
Point query: Given and , return all objects such that
The concept of equality (operator =) needs to be precisely
defined
For example, iff all the dimensions individually are the
same,
i.e.
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ctives_template
/C|/Documents%20and%20Settings/iitkrana1/My%20Documents/Google%20Talk%20Received%20Files/ist_data/lecture1/1_7.htm[6/14/2012
3:12:21 PM]
Module 1: Basics and BackgroundLecture 1: Basic Database
Queries
Exact match query or Point query
Point query: Given and , return all objects such that
The concept of equality (operator =) needs to be precisely
defined
For example, iff all the dimensions individually are the
same,
i.e.
Equality can be defined over a subset of the dimensions as
well
For example ,
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ctives_template
/C|/Documents%20and%20Settings/iitkrana1/My%20Documents/Google%20Talk%20Received%20Files/ist_data/lecture1/1_8.htm[6/14/2012
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Module 1: Basics and BackgroundLecture 1: Basic Database
Queries
Extended setting
Database of objects
Each object has dimensions
Query is an object with the same dimensions
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/C|/Documents%20and%20Settings/iitkrana1/My%20Documents/Google%20Talk%20Received%20Files/ist_data/lecture1/1_9.htm[6/14/2012
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Module 1: Basics and BackgroundLecture 1: Basic Database
Queries
Extended setting
Database of objects
Each object has dimensions
Query is an object with the same dimensions
Distance function between two objects
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ctives_template
/C|/Documents%20and%20Settings/iitkrana1/My%20Documents/Google%20Talk%20Received%20Files/ist_data/lecture1/1_10.htm[6/14/2012
3:12:22 PM]
Module 1: Basics and BackgroundLecture 1: Basic Database
Queries
Extended setting
Database of objects
Each object has dimensions
Query is an object with the same dimensions
Distance function between two objects
If dimensions are defined, distance function can be, for
example,Euclidean, Manhattan , etc.
Can be over a subset of dimensions
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/C|/Documents%20and%20Settings/iitkrana1/My%20Documents/Google%20Talk%20Received%20Files/ist_data/lecture1/1_11.htm[6/14/2012
3:12:22 PM]
Module 1: Basics and BackgroundLecture 1: Basic Database
Queries
Extended setting
Database of objects
Each object has dimensions
Query is an object with the same dimensions
Distance function between two objects
If dimensions are defined, distance function can be, for
example,Euclidean, Manhattan , etc.
Can be over a subset of dimensions
Otherwise, can be a metric distance
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ctives_template
/C|/Documents%20and%20Settings/iitkrana1/My%20Documents/Google%20Talk%20Received%20Files/ist_data/lecture1/1_12.htm[6/14/2012
3:12:22 PM]
Module 1: Basics and BackgroundLecture 1: Basic Database
Queries
Extended setting
Database of objects
Each object has dimensions
Query is an object with the same dimensions
Distance function between two objects
If dimensions are defined, distance function can be, for
example,Euclidean, Manhattan , etc.
Can be over a subset of dimensions
Otherwise, can be a metric distance
If is not a metric distance, then the problem is much harder
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ctives_template
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Module 1: Basics and BackgroundLecture 1: Basic Database
Queries
Similarity search
Range query: Given , , and range , return all objects such
that
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Module 1: Basics and BackgroundLecture 1: Basic Database
Queries
Similarity search
Range query: Given , , and range , return all objects such
that
Nearest neighbour (kNN) query : Given , , and number of
nearest
neighbour , return objects such that
| | = and for any
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Module 1: Basics and BackgroundLecture 1: Basic Database
Queries
Similarity search
Range query: Given , , and range , return all objects such
that
Nearest neighbour (kNN) query : Given , , and number of
nearest
neighbour , return objects such that
| | = and for any
Window query: Given and ranges in each dimension
, return all objects such that
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