The transactions below are supposed to have a write-read conflict (dirty reads). But I am having a hard time understanding how.  T1:   R(A), W(A),                          R(B), W(B), Abort T2:                        R(A), W(A), C   The way I understand this is that transaction 1 (T1) reads A and then writes A. Then transaction 2 reads A and then writes A. Finally, transaction 1 reads B and then writes B. I don't see how this creates a write-read conflict. Can someone explain how this is the case?

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
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The transactions below are supposed to have a write-read conflict (dirty reads). But I am having a hard time understanding how. 

T1:   R(A), W(A),                          R(B), W(B), Abort

T2:                        R(A), W(A), C

 

The way I understand this is that transaction 1 (T1) reads A and then writes A. Then transaction 2 reads A and then writes A. Finally, transaction 1 reads B and then writes B. I don't see how this creates a write-read conflict. Can someone explain how this is the case?

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