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Distributed Database Systems, 1st Edition by Chhanda Ray
book

Distributed Database Systems, 1st Edition by Chhanda Ray

by Chhanda Ray
May 2024
Intermediate to advanced content levelIntermediate to advanced
325 pages
12h 2m
English
Pearson India
Content preview from Distributed Database Systems, 1st Edition by Chhanda Ray
204
Distributed Database Systems
Example 11.14
Let us consider the following join operation that involves three different relations Student, Course,
and Teacher, and over the attribute course-id.
Student
Ԯ
course-id
Course
Ԯ
course-id
Teacher
Further assume that the relations Student, Course and Teacher are stored at site 1, site 2 and site 3
respectively. The corresponding join graph is depicted in fi gure 11.14.
Fig. 11.14 Join Graph for a Distributed Query
Student
Course
Teacher
course-idcourse-id
Site2
Site3
Site1
There are various ways to perform the above join operation, but to select the best one, some
more information must be known: size(Student), ...
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Publisher Resources

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