subject

Sequence S1: T1:R(X), T2:W(X), T2:W(Y), T3:W(Y), T1:W(Y), T1:Commit, T2:Commit, T3:CommitSequence S2: T1:R(X), T2:W(Y), T2:W(X), T3:W(Y), T1:W(Y), T1:Commit, T2:Commit, T3:CommitFor each sequence and for each of the following concurrency control mechanisms, describe how the concurrency control mechanism handles the sequence. Assume that the timestamp of transaction Ti is i. For lock-based concurrency control mechanisms, add lock and unlock requests to the previous sequence of actions as per the locking protocol. The DBMS processes actions in the order shown. If a transaction is blocked, assume that all its actions are queued until it is resumed; the DBMS continues with the next action (according to the listed sequence) of an unblocked transaction.1. Strict 2PL with timestamps used for deadlock prevention (using Wait-Die policy).2. Strict 2PL with deadlock detection. (Show the waits-for graph in case of deadlock.)3. Optimistic concurrency control.4. Timestamp concurrency control with buffering of reads and writes (to ensure recoverability) and the Thomas Write Rule.5. Multiversion timestamp concurrency control.

ansver
Answers: 1

Another question on Computers and Technology

question
Computers and Technology, 22.06.2019 10:30
Choose the best explanation for the following statement communication is symbolic
Answers: 3
question
Computers and Technology, 23.06.2019 09:00
Which best describes the role or restriction enzymes in the analysis of edna a. to break dna into fragments that vary in size so they can be sorted and analyzed b. to amplify small amounts of dna and generate large amounts of dna for analysis c. to purify samples of dna obtained from the environment so they can be analyzed d. to sort different sizes of dna fragments into a banding pattern that can be analyzed
Answers: 1
question
Computers and Technology, 23.06.2019 15:00
Plz ( which is an example of a good url?
Answers: 1
question
Computers and Technology, 23.06.2019 19:00
Whose task it is to ensure that the product flows logically from one step to another?
Answers: 3
You know the right answer?
Sequence S1: T1:R(X), T2:W(X), T2:W(Y), T3:W(Y), T1:W(Y), T1:Commit, T2:Commit, T3:CommitSequence S2...
Questions
question
Mathematics, 07.10.2021 01:00
question
Mathematics, 07.10.2021 01:00
question
Business, 07.10.2021 01:00
question
Mathematics, 07.10.2021 01:00
question
English, 07.10.2021 01:00
question
Arts, 07.10.2021 01:00