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Which of the following time stamp ordering protocol(s) allow(s) the following schedule?

S: W1(A), W2(A), W3(A), R2(A), R4(A);

Time Stamps: T1:5, T2:10, T3:15, T4:20

  1. Tomas Write Rule
  2. Basic Time Stamp
  1. Only 1
  2. Only 2
  3. Both 1 and 2
  4. Neither 1 nor 2 

 

Please describe your answer.

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D,

R2(A) will not be allowed in Thomas write rule because w3(A) has done before it and time stamp of t3 greater than t2 transaction.

Hence basic time stamp also fails here.

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