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
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
相关考题：
考虑两个事务Ti={Ii}和Tj={Ij}，以及定义在Ti，Tj上的并发调度S，其中Ii，Ij分别代表组成Ti和Tj的操作，则下列中不会引起事务Ti的操作Ii与事务Tj的操作Ij冲突的是______。A．Ii=read(Q)，Ij=write(Q)B．Ii=write(Q)，Ij=read(Q)C．Ii=read(Q)，Ij=read(Q)D．Ii=write(Q)，Ij=write(Q)
事务T0、T1和T2并发访问数据项A、B和C,下列属于冲突操作的是______。A.T0中的read(A)和TO中的write( 事务T0、T1和T2并发访问数据项A、B和C，下列属于冲突操作的是______。A．T0中的read(Ａ)和TO中的write(Ａ)B．T0中的read(Ｂ)和T2中的read(Ｃ)C．T0中的write(Ａ)和T2中的write(Ｃ)D．T1中的read(Ｃ)和T2中的write(Ｃ)
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What is the default SNMP permission level on Junos devices?() A. readB. read-writeC. read-onlyD. write
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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（））。
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（）
以下是SD卡读取权限的是（）A、android.permission.READ_EXTERNAL_STORAGEB、android.permission.WRITE_EXTERNAL_STORAGEC、android.permission.WRITE_CALENDARD、android.permission.READ_PHONE_STAT
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）
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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 recoveryB、 recovery using backup control file is not possible， so restore all the files from the last full database backup， and then open the databaseC、 drop the read-only tablespace and re-create the tablespace after recoveryD、 perform a recovery； status of the tablespace in control file will be changed automatically
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.
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.
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.
Which operations require undo data（）A、Committing a transactionB、Flashing back a transactionC、Recovering a failed transactionD、Running a read-consistent queryE、Changing a tablespace status from READ ONLY to READ WRITE
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.
单选题SNMPv2的5种访问级别由小到大排列正确的是（）。Anot-accessible，accessible-for-notify，read-only，read-write，read-createBnot-accessible，read-only，read-write，read-create，accessible-for-notifyCread-only，read-write，read-create，accessible-for-notify，not-accessibleDread-only，read-write，read-create，not-accessible，accessible-for-notify
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?（）AThe seed will be in mount state.BThe seed will be opened read-only.CThe seed will be opened read/write.DThe other PDBs will be in mount state.EThe other PDBs will be opened read-only.FThe PDBs will be opened read/write.
单选题以下是SD卡读取权限的是（）Aandroid.permission.READ_EXTERNAL_STORAGEBandroid.permission.WRITE_EXTERNAL_STORAGECandroid.permission.WRITE_CALENDARDandroid.permission.READ_PHONE_STAT
多选题Which operations require undo data（）ACommitting a transactionBFlashing back a transactionCRecovering a failed transactionDRunning a read-consistent queryEChanging a tablespace status from READ ONLY to READ WRITE
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?（）AThe seed will be in mount state.BThe seed will be opened read-only.CThe seed will be opened read/write.DThe other PDBs will be in mount state.EThe other PDBs will be opened read-only.FThe PDBs will be opened read/write.