Queue of entering processes Monitor waiting area Entrance MONITOR Local data Condition el Cwait(cl) Condition variables Procedure I Condition cn Cwait (en) Procedure k Urgent queue csignal Initialization code 미머 Exit Figure 3. The structure of a monitor relative to concurrency. Questions: 5. Deduce at least one (1) characteristic of a monitor based on Figure 3. Elaborate on your answer. 6. Would you agree that a monitor, as a concurrency mechanism, can support process synchronization? Why or why not?

Queue of entering processes Monitor waiting area Entrance MONITOR Local data Condition el Cwait(cl) Condition variables Procedure I Condition cn Cwait (en) Procedure k Urgent queue csignal Initialization code 미머 Exit Figure 3. The structure of a monitor relative to concurrency. Questions: 5. Deduce at least one (1) characteristic of a monitor based on Figure 3. Elaborate on your answer. 6. Would you agree that a monitor, as a concurrency mechanism, can support process synchronization? Why or why not?

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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Transaction management deals with the problems of always keeping the database in a consistent state even when concurrent accesses and failures occur. Isolation requires that each transaction sees a consistent database at all times and that an executing transaction cannot reveal its results to other concurrent transactions before its commitment. ANSWER If two concurrent transactions access a data item that is being updated by one of them, it is not possible to guarantee that the second will read the correct value. Dirty reads and nonrepeatable reads may occur when one transaction can see intermediate results of another transaction before it has been committed.. Given below are two concurrent transactions T1 and T2 whose balances of amount x (balx) were recorded at times t, between t₁ and tg. As shown in the table below: If these two transactions interfere with each other, fill in the table below by selecting from the drop down list the values of balance X (bal,) at specified times…
Explain the three most prevalent problems with concurrent transaction execution. Explain how you can avoid these issues by using concurrency control.
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