[单选]
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 database buffer cache
C . because of data from a temporary tablespace
D . because of undo data from the undo tablespace

评估现存企业的方法主要有（）。市场价值评估法。经验评估法。盈利能力评估法。现金流量折现法。资产价值评估法。变桨系统是通过（）实现机舱控制柜与变桨控制系统的（）和（）传输。轮毂内旋转的动力电缆和控制电缆完全由滑环内（）和（）的滑动接触来实现（）和（）的传输。（）和（）是由镀金环和金合金电刷组成，充分保证了最小磨损和滑动接触的可靠性。 Which interconnect is used on the storage side of the SONAS storage node to provide highperformance?（） 6 Gbps SAS 。 Fibre Channel 。 10 Gb Ethernet 。 InfiniBand (IB)。额定电压交流（）kV及以下的应为低压电器设备.器具和材料。 1。 2。 5。 10。流水生产的基本特征是（）。连续性。按节拍生产。工序同期化。存在流动在制品化。

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？（）

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