Computers and Technology, 23.06.2020 23:01 kulvindar1984
In database transaction concurrency, the lost update anomaly is said to occur if a transaction Tj reads a data item, then another transaction Tk writes the data item (possibly based on a previous read), after which Tj writes the data item. The update performed by Tk has been lost, since the update done by Tj ignored the value written by Tk
a. Give an example of a sequence showing the lost update anomaly
b. Give an example sequence to show that the lost update anomaly is possible with the read committed isolation level.
c. Explain why the lost update anomaly is not possible with the repeatable read isolation level.
Answers: 1
Computers and Technology, 23.06.2019 07:30
What is the original authority for copyright laws
Answers: 1
Computers and Technology, 23.06.2019 22:00
Technician a says engine assemblies can be mounted longitudinally in a chassis. technician b says engine assemblies can be mounted transversely in a chassis. who is correct?
Answers: 2
Computers and Technology, 24.06.2019 00:20
The guy wire bd exerts on the telephone pole ac a force p directed along bd. knowing the p must have a 720-n component perpendicular to the pole ac, determine the magnitude of force p and its component along line ac.
Answers: 2
Computers and Technology, 24.06.2019 05:50
What all vehicles has tesla inc. created over the years
Answers: 3
In database transaction concurrency, the lost update anomaly is said to occur if a transaction Tj re...
Mathematics, 26.02.2021 17:40
Mathematics, 26.02.2021 17:40
Chemistry, 26.02.2021 17:40
Mathematics, 26.02.2021 17:40
Mathematics, 26.02.2021 17:40
History, 26.02.2021 17:40
Mathematics, 26.02.2021 17:40
Mathematics, 26.02.2021 17:40
Mathematics, 26.02.2021 17:40
English, 26.02.2021 17:40