Maurice Tutor

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    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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    Phoniex University
    Oct-2001 - Nov-2016

Category > Computer Science Posted 21 Jul 2017 My Price 5.00

serializability graph

Consider the following (incomplete) schedule S:

T1:R(X),

T1:R(Y),

T1:W(X),

T2:R(Y),

T3:W(Y),

T1:W(X),

T2:R(Y)

1. Can you determine the serializability graph for this schedule? Assuming that all three transactions eventually commit, show the serializability graph.

2. For each of the following, modify S to create a complete schedule that satisfies the stated condition. If a modification is not possible, explain briefly. If it is possible, use the smallest possible number of actions (read, write, commit, or abort). You are free to add new actions anywhere in the schedule S, including in the middle.

(a) Resulting schedule avoids cascading aborts but is not recoverable.

(b) Resulting schedule is recoverable.

(c) Resulting schedule is conflict-serializable.

Answers

Maurice Tutor
(5)
Status NEW Posted 21 Jul 2017 08:07 AM My Price 5.00

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