户一般用()工具来建立分区上的文件系统。
A、mknod
B、fdisk
C、foemat
D、mkfs
用户交给计算机做的工作称为()。
A、进程
B、线程
C、作业
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
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
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。
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