Because, if it does not contain any Blind-write, we can surely state that the schedule would not be View-Serializable. Hence the schedule S’ may or may not be View-Serializable.
We found that the schedule s’ contains a blind-write write2(a) in transaction T2.
Methods to check View-Serializability of a schedule – So, to address the limitation of the Conflict-Serializability concept View-Serializability method came into the picture. As we look in the above example, where the precedence graph of the Schedule S 1 was giving consistent result, equivalent to the serializable result of the Schedule S’ 1, despite containing cycles/loops. In this situation, we cannot predict whether it is consistent and serializable or not. Note : In the above example we understood that if a schedule is Conflict-serializable so we can easily predict that It would be –īut what if it is non-conflict serializable (precedence graph contains loop).
Now, we see that the precedence graph of the second table does not contain any cycle/loop, which means it is conflict serializable (equivalent to serial schedule, consistent) and the final result is coming the same as the first table.
USB key drive data rescue utility has GUI functionality which provides USB key drive files restoration of formatted, deleted or corrupted USB drives due to virus attack, system faults, software malfunctioning.
USB Thumb Drive Data Recovery 3.0.1.5 download
Top Software Keywords Show more Show less