6. What incorrect information is generated by the following schedule of transactions T1 and T2? T1 is designed to compute the sum of accounts A and B; T2 is designed to transfer $100 from account A to account B. T1 is begin retrieving the balance of account A, then T2 performs its transfer; and finally, T1 retrieves the balance of account B and reports the sum of the values it has retrieved.

6. What incorrect information is generated by the following schedule of transactions T1 and T2? T1 is designed to compute the sum of accounts A and B; T2 is designed to transfer $100 from account A to account B. T1 is begin retrieving the balance of account A, then T2 performs its transfer; and finally, T1 retrieves the balance of account B and reports the sum of the values it has retrieved.

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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Question

6. What incorrect information is generated by the following schedule of transactions T1 and T2? T1
is designed to compute the sum of accounts A and B; T2 is designed to transfer $100 from account
A to account B. T1 is begin retrieving the balance of account A, then T2 performs its transfer; and
finally, T1 retrieves the balance of account B and reports the sum of the values it has retrieved.

5. Identify some of the objects that you would expect to find in an object-oriented database used to
maintain a grocery store's inventory. What methods would you expect to find within each of the
objects?

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