Maurice Tutor

(5)

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About Maurice Tutor

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Expertise:
Algebra,Applied Sciences See all
Algebra,Applied Sciences,Biology,Calculus,Chemistry,Economics,English,Essay writing,Geography,Geology,Health & Medical,Physics,Science Hide all
Teaching Since: May 2017
Last Sign in: 398 Weeks Ago, 5 Days Ago
Questions Answered: 66690
Tutorials Posted: 66688

Education

  • MCS,PHD
    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

Experience

  • Professor
    Phoniex University
    Oct-2001 - Nov-2016

Category > Computer Science Posted 23 Sep 2017 My Price 5.00

individual tuples or pages

Answer each of the following questions briefly. The questions are based on the following relational schema:

 

Emp(eid: integer, ename: string, age: integer, salary: real, did: integer)

Dept(did: integer, dname: string, floor: integer)

 

and on the following update command:

 

replace (salary = 1.1 * EMP.salary) where EMP.ename = `Santa"

 

1. Give an example of a query that would conflict with this command (in a concurrency control sense) if both were run at the same time. Explain what could go wrong, and how locking tuples would solve the problem.

 

2. Give an example of a query or a command that would conflict with this command, such that the conflict could not be resolved by just locking individual tuples or pages, but requires index locking.

3. Explain what index locking is and how it resolves the preceding conflict

Answers

Maurice Tutor
(5)
Status NEW Posted 23 Sep 2017 08:09 AM My Price 5.00

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