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. Also mention to write the action too. i. ii. iv. v. vi. Tp: Rp (A) Tq: Wq (B) Tp: Wp (B) Tr. Wr (C) Tp: Wp (A) Tr. Wr (B)
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. Also mention to write the action too. i. ii. iv. v. vi. Tp: Rp (A) Tq: Wq (B) Tp: Wp (B) Tr. Wr (C) Tp: Wp (A) Tr. Wr (B)
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Transcribed Image Text:a)
Tp
Tq
Tr
Rp (A)
Wq (B)
Wr (C)
i.
ii.
iii.
iv.
Wp (B)
You are given data of actions of total 3 transactions ie, Tp. Tq and Tr. R for read and W
for write.
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.
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