Tp Tq Tr Rp (A) Wq (B) Wr (C) Wp (B) Wr (B) Figure 4.1 Wp (A) You are given data of actions of total 3 transactions i.e, Tp, Tq and Tr. R for read and W for write. As you know the concept of strict two-phase locking: after all the actions are completed, only then transaction is unlocked. So to solve this you have exclusive and shared locks i.e, "xl(data item)" and "sl(data item)" respectively. Each of the action's order is interleaved. Write down for all the given questions, how the transactions should perform using the necessary locks and unlocks so that the given actions occur.
Tp Tq Tr Rp (A) Wq (B) Wr (C) Wp (B) Wr (B) Figure 4.1 Wp (A) You are given data of actions of total 3 transactions i.e, Tp, Tq and Tr. R for read and W for write. As you know the concept of strict two-phase locking: after all the actions are completed, only then transaction is unlocked. So to solve this you have exclusive and shared locks i.e, "xl(data item)" and "sl(data item)" respectively. Each of the action's order is interleaved. Write down for all the given questions, how the transactions should perform using the necessary locks and unlocks so that the given actions occur.
Database Systems: Design, Implementation, & Management
11th Edition
ISBN:9781285196145
Author:Steven, Steven Morris, Carlos Coronel, Carlos, Coronel, Carlos; Morris, Carlos Coronel and Steven Morris, Carlos Coronel; Steven Morris, Steven Morris; Carlos Coronel
Publisher:Steven, Steven Morris, Carlos Coronel, Carlos, Coronel, Carlos; Morris, Carlos Coronel and Steven Morris, Carlos Coronel; Steven Morris, Steven Morris; Carlos Coronel
Chapter10: Transaction Management And Concurrency Control
Section: Chapter Questions
Problem 15RQ
Related questions
Question
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![e
Tp
Tq
Tr
Rp (A)
Wq (B)
Wr (C)
i.
ii.
Wp (B)
You are given data of actions of total 3 transactions i.e, Tp, Tq and Tr. R for read and W
for write.
iv.
V.
vi.
Wr (B)
As you know the concept of strict two-phase locking: after all the actions are completed,
only then transaction is unlocked.
Tp: Rp (A)
Tq: Wq (B)
Tp: Wp (B)
Tr: Wr (C)
Figure 4.1
So to solve this you have exclusive and shared locks i.e, "xl(data item)" and "sl(data item)"
respectively.
Each of the action's order is interleaved.
Tp: Wp (A)
Tr: Wr (B)
Wp (A)
Write down for all the given questions, how the transactions should perform using the
necessary locks and unlocks so that the given actions occur.
Also mention to write the action too. [6]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F69d1366e-9441-458e-b538-322d14f8c8c9%2F0e36404b-dc31-4e4c-941c-7483eba76e60%2Fx2iwhen_processed.png&w=3840&q=75)
Transcribed Image Text:e
Tp
Tq
Tr
Rp (A)
Wq (B)
Wr (C)
i.
ii.
Wp (B)
You are given data of actions of total 3 transactions i.e, Tp, Tq and Tr. R for read and W
for write.
iv.
V.
vi.
Wr (B)
As you know the concept of strict two-phase locking: after all the actions are completed,
only then transaction is unlocked.
Tp: Rp (A)
Tq: Wq (B)
Tp: Wp (B)
Tr: Wr (C)
Figure 4.1
So to solve this you have exclusive and shared locks i.e, "xl(data item)" and "sl(data item)"
respectively.
Each of the action's order is interleaved.
Tp: Wp (A)
Tr: Wr (B)
Wp (A)
Write down for all the given questions, how the transactions should perform using the
necessary locks and unlocks so that the given actions occur.
Also mention to write the action too. [6]
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