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When transaction Ti requests a data item currently held by Tj, Ti is allowed to wait only if it has a timestamp larger than that of Tj (that is, Ti is younger than Tj ). Otherwise, Tj is rolled back (Tj is wounded by Ti). This is

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When transaction Ti requests a data item currently held by Tj, Ti is allowed to wait only if it has a timestamp larger than that of Tj (that is, Ti is younger than Tj ). Otherwise, Tj is rolled back (Tj is wounded by Ti). This is

(a) Wait-die

(b) Wait-wound

(c) Wound-wait

(d) Wait

The question was asked in examination.

My query is from Deadlocks in portion Concurrency Control of Database Management

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Correct answer is (c) Wound-wait

The explanation is: The wound–wait scheme is a preemptive technique. It is a counterpart to the wait–die scheme.

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