1. Query processing Suppose we have the following relational schema: Students (sid:integer, name:string, gpa:real) Courses (course:string, credits:integer) Enrolled (sid:integer, course:string, semester:string) Also suppose there are hash indexes on Students.sid, Enrolled.sid, and Enrolled.course. Describe how you would compute each operation in the query execution tree below. For each operation, provide an algorithm name or write "on the fly". Indicate whether the results of the operation will be materialized to disk or pipelined to the next operation. Be sure to indicate where indexes are used.

1. Query processing Suppose we have the following relational schema: Students (sid:integer, name:string, gpa:real) Courses (course:string, credits:integer) Enrolled (sid:integer, course:string, semester:string) Also suppose there are hash indexes on Students.sid, Enrolled.sid, and Enrolled.course. Describe how you would compute each operation in the query execution tree below. For each operation, provide an algorithm name or write "on the fly". Indicate whether the results of the operation will be materialized to disk or pipelined to the next operation. Be sure to indicate where indexes are used.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

1. Query processing
Suppose we have the following relational schema:
Students(sid:integer, name:string, gpa:real)
Courses (course:string, credits:integer)
Enrolled (sid:integer, course:string, semester:string)
Also suppose there are hash indexes on Students.sid, Enrolled.sid, and Enrolled.course.
Describe how you would compute each operation in the query execution tree below. For each operation,
provide an algorithm name or write “on the fly". Indicate whether the results of the operation will be
materialized to disk or pipelined to the next operation. Be sure to indicate where indexes are used.
name
Enrolled
Ogpa>3
sid=sid
course=CISC437 Students

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