Maurice Tutor

(5)

$15/per page/Negotiable

About Maurice Tutor

Levels Tought:
Elementary,Middle School,High School,College,University,PHD

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, 2 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 14 Sep 2017 My Price 6.00

typical lock manager

Exercise  17.1  Answer the following questions:

 

1.     Describe how a typical lock manager is implemented. Why must lock and unlock be atomic operations? What is the difference between a lock and a latch?  What are  convoys and how should a lock manager handle them?

2.      Compare lock downgrades  with  upgrades.  Explain  why  downgrades  violate  2PL but are nonetheless acceptable. Discuss the use of update locks in conjunction with lock downgrades.

3.      Contrast the timestamps assigned  to  restarted  transactions  when  tinwstanlps  are  used for deadlock prevention versus when timestamps are used for concurrency control.

4.      State and justify the Thomas Write Rule.

5.      Show that, if two schedules are conflict equivalent, then they are view equivalent.

6.       Give an example of a serializable schedule that is not strict.

7.      Give an example of a strict schedule that is not serialiable.

8.    and  describe  the  use  of  locks  for  improved  conflict  resolution  in  Optinlistic Concurrency Control.

 

Answers

Maurice Tutor
(5)
Status NEW Posted 14 Sep 2017 12:09 PM My Price 6.00

Hel-----------lo -----------Sir-----------/Ma-----------dam-----------Tha-----------nk -----------You----------- fo-----------r u-----------sin-----------g o-----------ur -----------web-----------sit-----------e a-----------nd -----------and----------- ac-----------qui-----------sit-----------ion----------- of----------- my----------- po-----------ste-----------d s-----------olu-----------tio-----------n.P-----------lea-----------se -----------pin-----------g m-----------e o-----------n c-----------hat----------- I -----------am -----------onl-----------ine----------- or----------- in-----------box----------- me----------- a -----------mes-----------sag-----------e I----------- wi-----------ll

Not Rated(0)