1Z0-042 Real Exam Dumps DEMO

Question 1: The user SCOTT executes the following command successfully to increase the salary values in one of
his sessions:
SQL> UPDATE emp SET sal=sal*1.15 WHERE deptno=20;
Before SCOTT ends the transaction, user HR who has the privileges on EMP table executes a query to
fetch the salary details but finds the old salary values instead of the increased values.
Why does HR still see the old data?
A. because of redo data from redo log file
B. because of data from a temporary tablespace
C. because of undo data from the undo tablespace
D. because of data from database buffer cache
Correct Answer: C