When a transaction is rolled-back under timestamp ordering, it is assigned a new timestamp. Why can it not simply keep its old timestamp?
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When a transaction is rolled-back under timestamp ordering, it is assigned a
new timestamp. Why can it not simply keep its old timestamp?
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- A new timestamp is assigned to a transaction if it is rolled back in timestamp order. Why can't it simply use the same date and time as before?A new timestamp will be applied to a transaction in line with the ordering of timestamps if that transaction is rolled back. Why is it that it can't just keep the timestamp that it had before?The recurring transaction type that generates an alert when we should use a recurring transaction to enter a new transaction is
- Database Systems Each branch of the Jaja restaurant has a mainstay menu that is very popular with customers, so information on the availability of the number of servings is needed to be able to serve orders. Here are two transactions that are ordering a food menu at the same time. T1: Start the transaction at time t1, read 10 servings of food stock at t2. Because ordering one portion, the stock is reduced by 1 at t3. On t6, update the stock count, and commit to t7. T2: Transaction T2 starts a transaction on t2, reads the number of stocks in t3 as many as 10. At t4 orders 3 portions. On t5 it updates the stock to 7 and then on t6 commits it. As a result of the T1 and T2 transactions above, there was an error in the amount of food stocks. Make a solution with 2PL. What kinds of problems happened? Give a reason why choosing this type of problem! How much food is still available?Assignment 4: Question#1: Give any three examples of transaction where next operations are dependent upon previous and focus on importance of transaction. Question#2: Execute the given transaction left to right and fill “local variable” and “Database variable” columns. Initial Database Values: x=30, y=50,z=80What are conditions under which a deadlock situation may arise?
- Under what circumstances does the wait-die scheme perform better than the wound-wait scheme for granting resources to concurrently executing transactions?What is the significance of "commit points" in long-running transactions?Give an example of a serializable schedule with two transactions such that the order in which the transactions commit is different from the serialization order