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
在教师表中,如果要找出职称为“教授”的教师,所采用的关系运算是( )。
A、投影
B、选择
C、联接
D、自然选择
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。
Matthew has recently joined NetFx Corporation as a junior-level Database Administrator (DBA). He is asked by his supervisor to verify the database for data block corruptions. He uses the DBVERIFY utility and finds that two data blocks are corrupted in the database. What should Matthew use to identify the corrupted blocks as well as datafiles containing these blocks?()
A、 datafile
B、 alert log
C、 dynamic views
D、 control file script
-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
用户交给计算机做的工作称为()。
A、进程
B、线程
C、作业