Consider the following snapshot of the transaction log in Table 1 while three transactions T1, T2 and
Question:
Consider the following snapshot of the transaction log in Table 1 while three transactions T1, T2 and T3 are executing:
T1: Changing the employee who manages a profile.
T2: Updating the password of member Penny (LogId 103)
T3: Updating the rating of App 345.
(a) Using the log information, write SQL statements corresponding to the three transactions.
(b) Suppose that after logId 109, a system failure occurred. Explain in detail how the system will recover from this system failure. Your explanation should include the actions which will be performed for transactions T1, T2 and T3 when the system restarts and state why these actions are necessary.
Can anyone explain how to do these questions?
Value at Risk The New Benchmark for Managing Financial Risk
ISBN: 978-0071464956
3rd edition
Authors: Philippe Jorion