Conflict and View serializable

Question

Comments

@joshi and what about T1->T2->T3?

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@saxena

yes, T1->T2->T3 is only view equivalent to above schedule.

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@ Parshu gate

For this schedule T2->T1->T3

Yes T1 is reading the data item for the first time but it is not actually reading the value of the data item that was before the start of all the transactions as it will be overwritten by T2.

So, this is not VS

Answer 1

i and vi

No cycle in polygraph and possible order is T1->T2->T3 according to the topological order of polygraph.