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, 23.06.2019 13:10
What is domain name system (dns)? allows dynamic ip address allocation so users do not have to have a preconfigured ip address to use the network converts ip addresses into domains, or identifying labels that use a variety of recognizable naming conventions the efficient coexistence of telephone, video, and data communication within a single network, offering convenience and flexibility not possible with separate infrastructures the integration of communication channels into a single service
Answers: 2
question
Computers and Technology, 24.06.2019 00:50
Which of the following is not a key player in the sale of travel products?
Answers: 2
question
Computers and Technology, 24.06.2019 15:00
Who introduced the concept of combining artificial and natural light in the studio
Answers: 1
question
Computers and Technology, 24.06.2019 23:30
Does anyone have the problem where you try to watch a video to get your answer but it brings up a thing asking your gender to make ads relevant but it doesn't load? btw i won't be able to see the answer so use the comments .
Answers: 1
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
English, 11.11.2020 18:50
question
Mathematics, 11.11.2020 18:50
question
Mathematics, 11.11.2020 18:50
question
Chemistry, 11.11.2020 18:50
question
Mathematics, 11.11.2020 18:50