Question

In this scenario:

1. Update rollback
2. Insert
3. Insert
4. Delete rollback
5. Update commit
Which statements would be saved to the database, assuming these are all in a single transaction?
A) None
B) 2, 3, 4, 5
C) 5
D) 1, 2, 3, 4, 5

Answer 1

In the given scenario, the database operations that would be saved to the database are the insert operations (2 and 3), as they were not rolled back before the final update commit statement.

Step-by-step explanation:

The scenario describes a series of database operations within a single transaction. A transaction is a sequence of operations performed as a single logical unit of work. If any operation within the transaction fails, the whole transaction is rolled back. If all operations succeed, the transaction is committed and the changes are saved.

Let's analyze each operation:

Update rollback: This operation would undo an update operation and its changes won't be saved.

Insert: This operation adds new data. Since there's no rollback after this insert, its changes are candidates to be saved upon commit.

Insert: This is another insert operation and, like the previous one, it is a candidate to be saved.

Delete rollback: This operation would undo a delete operation and its changes won't be saved.

Update commit: This final commit operation saves all preceding changes that have not been rolled back.

Therefore, the statements that would be saved to the database are the insert operations (2 and 3) as they were not rolled back before the commit statement.

Answer: B) 2, 3