1z0-071 Exam Dumps | Examine the description of the BOOKS table: (Exhibit) The table has 100 rows. Examine this sequence of

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Question 87/139

Examine the description of the BOOKS table:

The table has 100 rows.
Examine this sequence of statements issued in a new session;
INSERT INTO BOOKS VALUES ('ADV112' , 'Adventures of Tom Sawyer', NULL, NULL); SAVEPOINT a; DELETE from books; ROLLBACK TO SAVEPOINT a; ROLLBACK; Which two statements are true?

A. The first ROLLBACK command restores the 101 rows that were deleted, leaving the inserted row still to be committed.

B. The second ROLLBACK command does nothing.

C. The first ROLLBACK command restores the 101 rows that were deleted and commits the inserted row.

D. The second ROLLBACK command replays the delete.

E. The second ROLLBACK command undoes the insert.

Correct Answer: B,E

B: True. The second ROLLBACK command would not do anything because the first ROLLBACK TO SAVEPOINT a; already undid the delete operation, and there was no other DML operation between the first and the second ROLLBACK.
E: True. The second ROLLBACK command undoes the insert because after the first ROLLBACK TO SAVEPOINT a; there are no savepoints defined, so a subsequent ROLLBACK would undo all transactions to the beginning of the current session or last COMMIT.
The ROLLBACK command is used to undo transactions that have not yet been committed. Rolling back to a savepoint only undoes transactions up to that savepoint, and a subsequent ROLLBACK without a savepoint name will undo all uncommitted changes since the last COMMIT.
References:Oracle SQL documentation on the ROLLBACK statement provides details on how it interacts with savepoints and the effects it has on the transactions within a session.

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