2 votes 2 votes Databases conflict-serializable view-serializable transaction-and-concurrency databases concurrency + – Parshu gate asked Dec 5, 2017 Parshu gate 942 views answer comment Share Follow See all 10 Comments See all 10 10 Comments reply Show 7 previous comments saxena0612 commented Dec 6, 2017 reply Follow Share @joshi and what about T1->T2->T3? 0 votes 0 votes joshi_nitish commented Dec 6, 2017 reply Follow Share @saxena yes, T1->T2->T3 is only view equivalent to above schedule. 0 votes 0 votes srivivek95 commented Dec 6, 2017 reply Follow Share @ 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 1 votes 1 votes Please log in or register to add a comment.
0 votes 0 votes i and vi No cycle in polygraph and possible order is T1->T2->T3 according to the topological order of polygraph. Vishwesh Vinchurkar answered Jul 27, 2018 Vishwesh Vinchurkar comment Share Follow See all 0 reply Please log in or register to add a comment.