Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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The readers and writers dilemma may be posed in a number of different ways, depending on the order in which different categories of activities might be initiated. Speculate on three potential permutations of the issue, each of which may favor one set of procedures over another. Describe in detail the behavior of each variant when a reader or writer is ready to access the
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- Assume that the computer system has completed all of the necessary procedures to get a program ready to execute. Give a thorough explanation of how the computer system will execute the program, including the components of the computer system involved in each step. This query does not inquire about the actions required to prepare the program for execution. Rather, explain the steps that go into executing the software.arrow_forwardTransaction 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…arrow_forwardWhat precisely is an ADT, and how does it carry out its responsibilities?Is it possible that there may be drawbacks to the management of ADTs? Is there any other way you can think of in which heredity might assist individuals solve problems?arrow_forward
- Write a scenario for each of these two sequence diagrams:arrow_forwardThe readers and writers dilemma may be posed in many different ways depending on which set of processes is being considered. Speculate on three potential permutations of the issue, each of which may favor one set of procedures over another. Describe in detail the behavior of each variant when a reader or writer is ready to access the database and after a procedure has finished.arrow_forwardAssume you've been given the task of developing a logical model of a school or college's registration system. Would a top-down approach be preferable, or would a bottom-up approach be preferable? What factors might impact your choice?arrow_forward
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