在文件系统中,若要实现文件拷贝功能,可利用已有的系统调用,它们是A.create,open,read,write,closeB.create,open,read,write,deleteC.create,open,read,writeD.create,read,write,close

题目

在文件系统中,若要实现文件拷贝功能,可利用已有的系统调用,它们是

A.create,open,read,write,close

B.create,open,read,write,delete

C.create,open,read,write

D.create,read,write,close


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  • 第1题:

    What is the default SNMP permission level on Junos devices?()

    A. read

    B. read-write

    C. read-only

    D. write


    参考答案:C

  • 第2题:

    已知当前文件夹中有纯英文文本文件readme.txt,请填空完成功能把readme.txt文件中的所有内容复制到dst.txt中,withopen(’readme.txt’)assrc,open(’dst.txt’,)asdst:dst.write(src.read())。


    正确答案:'w'

  • 第3题:

    一个文件的权限是-rw-rw-r--,这个文件所有者的权限是什么。()

    • A、reAD-only
    • B、reAD-write
    • C、write

    正确答案:B

  • 第4题:

    下面答案中属于流的基本操作的是()和()。

    • A、读取(Read)
    • B、定位(Seek)
    • C、打开(Open)
    • D、关闭(Close)

    正确答案:A,B

  • 第5题:

    以下是SD卡读取权限的是()

    • A、android.permission.READ_EXTERNAL_STORAGE
    • B、android.permission.WRITE_EXTERNAL_STORAGE
    • C、android.permission.WRITE_CALENDAR
    • D、android.permission.READ_PHONE_STAT

    正确答案:A

  • 第6题:

    What is the default SNMP permision level on Junos devices?()

    • A、read
    • B、read-write
    • C、read-only
    • D、write

    正确答案:C

  • 第7题:

    You run a script that completes successfully using SQL*Plus that performs these actions: 1. Creates a multitenant container database (CDB) 2. Plugs in three pluggable databases (PDBs) 3. Shuts down the CDB instance 4. Starts up the CDB instance using STARTUP OPEN READ WRITE Which two statements are true about the outcome after running the script?()

    • A、The seed will be in mount state.
    • B、The seed will be opened read-only.
    • C、The seed will be opened read/write.
    • D、The other PDBs will be in mount state.
    • E、The other PDBs will be opened read-only.
    • F、The PDBs will be opened read/write.

    正确答案:B,D

  • 第8题:

    Which of the following is a prerequisite for running DBMS_TDB.CHECK_DB to a successful completion?()

    • A、 The database must be in read-write mode.
    • B、 The database must have no external files.
    • C、 The database must open in read-only mode.
    • D、 The database must be mounted but not opened.

    正确答案:C

  • 第9题:

    在Linux底层文件访问中的大多数操作都是围绕文件描述符来展开的其中()函数是内核向进程返回一个文件描述符为以后使用。

    • A、open()
    • B、read()
    • C、write()
    • D、close()

    正确答案:A

  • 第10题:

    单选题
    SNMPv2的5种访问级别由小到大排列正确的是()。
    A

    not-accessible,accessible-for-notify,read-only,read-write,read-create

    B

    not-accessible,read-only,read-write,read-create,accessible-for-notify

    C

    read-only,read-write,read-create,accessible-for-notify,not-accessible

    D

    read-only,read-write,read-create,not-accessible,accessible-for-notify


    正确答案: A
    解析: 暂无解析

  • 第11题:

    单选题
    以下是SD卡读取权限的是()
    A

    android.permission.READ_EXTERNAL_STORAGE

    B

    android.permission.WRITE_EXTERNAL_STORAGE

    C

    android.permission.WRITE_CALENDAR

    D

    android.permission.READ_PHONE_STAT


    正确答案: D
    解析: 暂无解析

  • 第12题:

    多选题
    You run a script that completes successfully using SQL*Plus that performs these actions: 1. Creates a multitenant container database (CDB) 2. Plugs in three pluggable databases (PDBs) 3. Shuts down the CDB instance 4. Starts up the CDB instance using STARTUP OPEN READ WRITE Which two statements are true about the outcome after running the script?()
    A

    The seed will be in mount state.

    B

    The seed will be opened read-only.

    C

    The seed will be opened read/write.

    D

    The other PDBs will be in mount state.

    E

    The other PDBs will be opened read-only.

    F

    The PDBs will be opened read/write.


    正确答案: E,B
    解析: 暂无解析

  • 第13题:

    SNMPv2的5种访问级别由小到大排列正确的是()。

    • A、not-accessible,accessible-for-notify,read-only,read-write,read-create
    • B、not-accessible,read-only,read-write,read-create,accessible-for-notify
    • C、read-only,read-write,read-create,accessible-for-notify,not-accessible
    • D、read-only,read-write,read-create,not-accessible,accessible-for-notify

    正确答案:A

  • 第14题:

    如果MIB对象的访问属性为reAD-write,SNMP访问模式为reAD-write时,可进行的操作有()

    • A、Get
    • B、Get、TrAp
    • C、Get、Set
    • D、Get、Set和TrAp

    正确答案:D

  • 第15题:

    在ASP中,Application对象的()方法用于控制应用程序变量的读写操作。

    • A、Open()和Close();
    • B、Lock()和Unlock();
    • C、MoveNext()和Move();
    • D、Read()和Write()

    正确答案:B

  • 第16题:

    SNMP不能改变主机的IP地址是由于IP地址表中管理对象的访问特性为()

    • A、Not-Accessible
    • B、Read-Only
    • C、Read-Create
    • D、Read-Write

    正确答案:B

  • 第17题:

    下列语句中哪条是错误的()?

    • A、WRITE(*,*)(I,A(I),I=1,N)
    • B、WRITE(*,*)(N,A(I),I=1,N)
    • C、READ(*,*)N,(A(I),I=1,N)
    • D、READ(*,*)(N,A(I),I=1,N)

    正确答案:D

  • 第18题:

    You have a read-only tablespace on read-only media. You want to perform a media recovery on the existing data files, but using a backup control file. The backup control file indicates that the status of the read-only tablespace was read/write when the control file was backed up. What should you consider?()

    • A、 take data files from the read-only tablespace offline before performing a recovery
    • B、 recovery using backup control file is not possible, so restore all the files from the last full database backup, and then open the database
    • C、 drop the read-only tablespace and re-create the tablespace after recovery
    • D、 perform a recovery; status of the tablespace in control file will be changed automatically

    正确答案:A

  • 第19题:

    Adam is working as a Database Administrator (DBA) for TeleSoft Corporation. His database is running in the ARCHIVELOG mode. During database startup, he discovers that one of the disks crashed, resulting in the permanent loss of a read-write USERS tablespace. The USERS01.dbf datafile belongs to the USERS tablespace and is 500 MB in size. He needs to recover the USERS tablespace from the backup. While reviewing the backup details, he discovers that the most recent available backup is five days old. This backup was taken when the USERS tablespace was read-only. After correcting the hardware problem that caused the failure, what should Adam do to recover the USERS tablespace?()

    • A、 Restore the USERS01.dbf file from the backup, and open the database using the STARTUP command.
    • B、 Restore the USERS01.dbf file using the RECOVER TABLESPACE command, and open the database using the ALTER DATABASE OPEN statement.
    • C、 Restore the USERS01.dbf file from the backup, recover the USERS tablespace using the RECOVER TABLESPACE command, and open the database using the ALTER DATABASE OPEN statement.
    • D、 Restore the USERS01.dbf file from the backup and change the status of the USERS tablespace from read-only to read-write using the ALTER TABLESPACE USERS READ WRITE statement. Then, recover the USERS tablespace using the RECOVER TABLESPACE command, and open the database using the ALTER DATABASE OPEN statement.

    正确答案:C

  • 第20题:

    Which operations require undo data()

    • A、Committing a transaction
    • B、Flashing back a transaction
    • C、Recovering a failed transaction
    • D、Running a read-consistent query
    • E、Changing a tablespace status from READ ONLY to READ WRITE

    正确答案:B,C,D

  • 第21题:

    单选题
    Which of the following is a prerequisite for running DBMS_TDB.CHECK_DB to a successful completion?()
    A

     The database must be in read-write mode.

    B

     The database must have no external files.

    C

     The database must open in read-only mode.

    D

     The database must be mounted but not opened.


    正确答案: A
    解析: 暂无解析

  • 第22题:

    多选题
    You run a script that completes successfully using SQL*Plus that performs these actions: 1. Creates a multitenant container database (CDB) 2. Plugs in three pluggable databases (PDBs) 3. Shuts down the CDB instance 4. Starts up the CDB instance using STARTUP OPEN READ WRITE Which two statements are true about the outcome after running the script?()
    A

    The seed will be in mount state.

    B

    The seed will be opened read-only.

    C

    The seed will be opened read/write.

    D

    The other PDBs will be in mount state.

    E

    The other PDBs will be opened read-only.

    F

    The PDBs will be opened read/write.


    正确答案: C,E
    解析: 暂无解析

  • 第23题:

    多选题
    Which operations require undo data()
    A

    Committing a transaction

    B

    Flashing back a transaction

    C

    Recovering a failed transaction

    D

    Running a read-consistent query

    E

    Changing a tablespace status from READ ONLY to READ WRITE


    正确答案: D,A
    解析: 暂无解析