{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

hw5-handout - Homework5 CS143Fall2009 ProblemI::involving...

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
11/23/09 1 Homework 5 CS143 Fall 2009 Problem I: Consider the following schedule:involving transacDons T1,T2, T3, T4 performing the following sequence of acDons (w3(A) means that T3 performs write(A), c2 means that T2 commits, etc.) w3(A) r1(A) c3 w1(B) c1 r2(B) w2(C) r4(B) c4 c2 (a) Is it a serial schedule? (b) Is the schedule conflict serializable? If so, what are all the equivalent serial schedules? (c) Is the schedule recoverable? (d) Is the schedule cascadeless? If not, can we make it cascadeless by moving a single commit operaDon to a different posiDon?
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
11/23/09 2 Recoverability An unrecoverable schedule: To be recoverable, transacDons must wait and commit only aSer all transacDons whose changes they read commit:
Image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.
  • Fall '01
  • Zaniolo
  • Ifnot,canwemakeit cascadelessbymovingasinglecommitoperaDontoa differentposiDon, cascadless recoverable allschedules, conflictserializable viewserializable allschedules

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern