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单选题

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?()

发布日期:2022-06-20

The user SCOTT executes the following command succ...
A

because of redo data from redo log file

B

because of data from database buffer cache

C

because of data from a temporary tablespace

D

because of undo data from the undo tablespace

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