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Consider the following sequences of actions ( given in schedule S 1 and S 2 ) listed in the order in [ 1 5 ]
Consider the following sequences of actions given in schedule S and S listed in the order in which they are submitted to the database system for execution: Schedule S: T: RX T: WX T: WY T: WY T:WY T: Commit, T: Commit, : Commit. Schedule S: T: RX T: WY T: WX T: WY T: WY T: Commit, : Commit, : Commit For each sequence and for each of the following concurrency control mechanisms, describe how the concurrency control mechanism handles the schedule sequence. Marks Strict PL with timestamps used for deadlock prevention. Strict PL with deadlock detection. Show the waits for graph if a deadlock cycle devops Not: Assume that the timestamp value of transaction Ti is i For lockbased concurrency control mechanism, add lock and unlock requests to the above sequence of actions as per the locking protocol. If a transaction is blocked, assume that all of its actions are queued until it is resumed; the DBMS continues with the next action according to the listed sequence of an unblocked transaction
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