You want to take a complete database backup using RMAN. The backup should consist only the used blocks from your database. Which two statements are true about this backup operation? （）(Choose two.)
ABackup compression should be enabled
BParallelism for the channel should be set to 2
CAll the files must be backed up as backup sets
DThe backup may be stored either on disk or on media with media manager
-48V直流供电系统要求全程压降不高于3．2V，计算供电系统的全程压降是由（）为起点，至负载端整个配电回路的压降。
A、开关电源输出端
B、配电回路输出端
C、列头柜配电回路输出端
D、蓄电池组输出端
If you are going to run a TSPITR recovery， which view will help you to determine which objects will be lost during the TSPITR？（）
A、 TS_OBJECTS_TO_BE_DROPPED
B、 TS_PTTR_OBJECT_DROPPED
C、 TS_PITR_OBJECTS_TO_BE_DROPPED
D、 TS_OBJECTS_DROPPED
E、 TS_DROPPED_OBJECTS
You are designing an application for a telecom company and you have been asked to design a database table to facilitate monthly bill generation. The bill would include details of customer calls， listed in chronological order. Which method would you follow to achieve this objective without increasing the overhead of sorting the rows？（）
A、create a hash cluster to store the data
B、create an index cluster to store the data
C、create a partitioned table to store the data
D、create a sorted hash cluster to store the data
E、create a heap table with rowid to store the data
用户交给计算机做的工作称为（）。
A、进程
B、线程
C、作业
IDE接口和软驱接口。IDE接口和软驱接口在主板上分别是两个40针和一个28针排线插座，IDE设备和软驱通过排线与之相连，每一个IDE插座可以接两个IDE设备，两个总共可以接4个设备。IDE设备主要指硬盘、光驱以及使用IDE界面的其他设备等。现在有些新主板上面增加了一个IDE控制器，因此，可能就会有4个IDE接口，总共可以接上8个IDE设备。