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Concurrency control mechanisms: enforceability of a given schedule

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This document discusses concurrency control mechanisms and their ability to enforce a given schedule. It asks to determine if a schedule can be enforced by two-phase locking or timestamping, and if so to show the modified schedule or if not to explain why it is not enforceable.

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3) [20 marks] Given the following schedule: For each of the following concurrency control mechanisms, determine if this schedule can be enforced with it. For the mechanisms that can enforce it, show the modified schedule. For the mechanisms that cannot enforce it, show why it is not enforceable. a) Two-phase locking b) Tumestamping (TS(T1)=1,TS(T2)=2 )

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  • 1. 3) [20 marks] Given the following schedule: For each of the following concurrency control mechanisms, determine if this schedule can be enforced with it. For the mechanisms that can enforce it, show the modified schedule. For the mechanisms that cannot enforce it, show why it is not enforceable. a) Two-phase locking b) Tumestamping (TS(T1)=1,TS(T2)=2 )