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In timestamp ordering protocol, suppose that the transaction Ti issues write(Q) and TS(Ti)<W-timestamp(Q), then

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in RDBMS by (118k points)
In timestamp ordering protocol, suppose that the transaction Ti issues write(Q) and TS(Ti)<W-timestamp(Q), then

(a) Read operation is executed

(b) Read operation is rejected

(c) Write operation is executed

(d) Write operation is rejected

This question was posed to me in an online quiz.

The question is from Timestamp based Protocols in chapter Concurrency Control of RDBMS

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Right option is (d) Write operation is rejected

The best I can explain: In timestamp ordering protocol, suppose that the transaction Ti issues write(Q) and TS(Ti)<W-timestamp(Q), then the value of Q that Ti is producing was needed previously, and the system assumed that the value would never be produced. Hence the system rejects the write(Q) operation and the transaction Ti rolls back.

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