参考答案和解析
正确答案:显示从初始HTTP请求(通常为get)到成功收到来自web服务器的第一次缓冲时为止所经过的时间。第一次缓冲度量可以判断是否存在web服务器延迟或者网络滞后。
更多“first buffer”相关问题
  • 第1题:

    In a recent Automatic Workload Repository (AWR) report for your database, you notice a high number of buffer busy waits. The database consists of locally managed tablespaces with free list managed segments.On further investigation, you find that buffer busy waits is caused by contention on data blocks.Which option would you consider first to decrease the wait event immediately?()

    A. Decreasing PCTUSED

    B. Decreasing PCTFREE

    C. Increasing the number of DBWN process

    D. Using Automatic Segment Space Management (ASSM)

    E. Increasing db_buffer_cache based on the V$DB_CACHE_ADVICE recommendation


    参考答案:D

  • 第2题:

    在文件中用来写一组数据,buffer:是一个指针,size:是要写的字节,count:是要写多少个数据项,fp:文件型指针,一般调用形式是()

    • A、write(buffer,size,count,fp)
    • B、fprinff(buffer,size,count,fp)
    • C、fwrite(buffer,size,count,fp)
    • D、fwrite(buffer,size,count,p)

    正确答案:C

  • 第3题:

    Lossless Ethernet for FCoE is achieved through the use of which features?()

    • A、 Priority flow control
    • B、 Buffer-to-buffer credits
    • C、 TCP retransmission
    • D、 Ethernet checksum
    • E、 QoS policies

    正确答案:A,E

  • 第4题:

    在执行“LEA BX,BUFFER”指令时,是把()。

    • A、BUFFER的内容→BX
    • B、BUFFER的偏移量→BX
    • C、BUFFER的段基值→BX
    • D、BUFFER的内容→EA

    正确答案:B

  • 第5题:

    You noticed that large memory allocations for the Oracle backup and restore operations are causing a performance overhead on the shared pool. Which memory structure would you configure to avoid this performance overhead?()

    • A、 recycle buffer cache
    • B、 large pool
    • C、 streams pool
    • D、 keep buffer cache
    • E、 redo log buffer

    正确答案:B

  • 第6题:

    fwrite函数的一般调用形式是()。

    • A、fwrite(buffer,count,size,fp)
    • B、fwrite(fp,size,count,buffer)
    • C、fwrite(fp,count,size,buffer)
    • D、fwrite(buffer,size,count,fp)

    正确答案:D

  • 第7题:

    以下fread函数的调用形式中,参数类型正确的是()

    • A、fread(unsignedsize,unsignedn,char*buffer,FILE*fp)
    • B、fread(char*buffer,unsignedsize,unsignedn,FILE*fp)
    • C、fread(unsignedsize,unsignedn,FILE*fp,char*buffer)
    • D、fread(FILE*fp,unsignedsize,unsignedn,char*buffer)

    正确答案:B

  • 第8题:

    Which is the correct description of a pinned buffer in the database buffer cache()

    • A、The buffer is currently being accessed.
    • B、The buffer is empty and has not been used.
    • C、The contents of the buffer have changed and must be flushed to the disk by the DBWn process. 
    • D、The buffer is a candidate for immediate aging out and its contents are synchronized with the block contents on the disk.

    正确答案:A

  • 第9题:

    You are creating an undo buffer that stores data modifications.You need to ensure that the undo functionality undoes the most recent data modifications first.You also need to ensure that the undo buffer permits the storage of strings only.Which code segment should you use?()

    • A、Stack<string> undoBuffer=new Stack<string>();
    • B、Stack undoBuffer=new Stack();
    • C、Queue<string> undoBuffer=new Queue<string>();
    • D、Queue undoBuffer=new Queue();

    正确答案:A

  • 第10题:

    单选题
    You are designing a Windows Azure application.   The application will use a Windows Azure AppFabric Service Bus message buffer.  You need to recommend an approach for ensuring that only authorized users can discover and use the message buffer.  What should you recommend?()
    A

     Make the message buffer discoverable to listeners and require authorization.

    B

     Make the message buffer discoverable to managers and do not require authorization.

    C

     Make the message buffer publicly discoverable.  Include a Simple Web Token (SWT) in each message.

    D

     Make the message buffer discoverable to managers.  Include a Simple Web Token (SWT) in each message.


    正确答案: B
    解析: 暂无解析

  • 第11题:

    单选题
    Which is the correct description of a pinned buffer in the database buffer cache()
    A

    The buffer is currently being accessed.

    B

    The buffer is empty and has not been used.

    C

    The contents of the buffer have changed and must be flushed to the disk by the DBWn process. 

    D

    The buffer is a candidate for immediate aging out and its contents are synchronized with the block contents on the disk.


    正确答案: C
    解析: Every buffer has an access mode:pinnedorfree(unpinned). A buffer is "pinned" in the cache so that it does not age out of memory while a user session accesses it. Multiple sessions cannot modify a pinned buffer at the same time.

  • 第12题:

    单选题
    An application accesses a small lookup table frequently. You notice that the required data blocks are getting aged out of the default buffer cache. How would you guarantee that the blocks for the table never age out?()
    A

    Configure the KEEP buffer pool and alter the table with the corresponding storage clause.

    B

    Increase the database buffer cache size.

    C

    Configure the RECYCLE buffer pool and alter the table with the corresponding storage clause.

    D

    Configure Automata Shared Memory Management.

    E

    Configure Automatic Memory Management


    正确答案: D
    解析: 暂无解析

  • 第13题:

    Which statement describes queue and buffer managment in the E-series router?()

    A. Buffer memory is managed dynamically in the I/O module.

    B. Buffer memory is managed dynamically in the switch fabric.

    C. Buffer memory is managed dynamically on egress line modules.

    D. Buffer memory is managed dynamically on ingress line modules


    参考答案:C

  • 第14题:

    在下面语句中,BUFFER称为()。 BUFFER.DB.01H,0AH

    • A、符号
    • B、变量
    • C、助记符
    • D、标号

    正确答案:D

  • 第15题:

    获得BUFFER单元有效地址的汇编指令为()。

    • A、MOV BX,BUFFER
    • B、LEA BX,BUFFER
    • C、MOV BX,[BUFFER]
    • D、LDS BX,BUFFER

    正确答案:B

  • 第16题:

    Which statement describes queue and buffer managment in the E-series router?()

    • A、Buffer memory is managed dynamically in the I/O module.
    • B、Buffer memory is managed dynamically in the switch fabric.
    • C、Buffer memory is managed dynamically on egress line modules.
    • D、Buffer memory is managed dynamically on ingress line modules

    正确答案:C

  • 第17题:

    Buffer(缓冲区)


    正确答案: 一段内存区域,用于存储图像信息。它可以为颜色、深度,也可以为混合信息。通常把红、绿、蓝和alpha缓冲区一起称为"颜色缓冲区"。

  • 第18题:

    能够在页面中关闭缓存的是()。

    • A、<%@Transaction=TRUE%>
    • B、Response.Buffer=True
    • C、Response.Buffer=false
    • D、Request.Querystring

    正确答案:C

  • 第19题:

    Given this method in a class:  public String toString() {  StringBuffer buffer = new StringBuffer();  buffer.append(‟<‟);  buffer.append(this.name);  buffer.append(‟>‟);  return buffer.toString();  }  Which is true?() 

    • A、 This code is NOT thread-safe.
    • B、 The programmer can replace StringBuffer with StringBuilder with no other changes.
    • C、 This code will perform well and converting the code to use StringBuilder will not enhance the performance.
    • D、 This code will perform poorly. For better performance, the code should be rewritten: return “<“+ this.name + “>”;

    正确答案:B

  • 第20题:

    In a recent Automatic Workload Repository (AWR) report for your database, you notice a high number of buffer busy waits. The database consists of locally managed tablespaces with free list managed segments. On further investigation, you find that buffer busy waits is caused by contention on data blocks. Which option would you consider first to decrease the wait event immediately?()

    • A、Decreasing PCTUSED
    • B、Decreasing PCTFREE
    • C、Increasing the number of DBWN process
    • D、Using Automatic Segment Space Management (ASSM)
    • E、Increasing db_buffer_cache based on the V$DB_CACHE_ADVICE recommendation

    正确答案:D

  • 第21题:

    缓冲区(Buffer zone)


    正确答案:指特定有害生物未发生或处于低度流行区并加以官方控制的、为防止有害生物扩散而采取植物检疫措施的地区。

  • 第22题:

    名词解释题
    first buffer

    正确答案: 显示从初始HTTP请求(通常为get)到成功收到来自web服务器的第一次缓冲时为止所经过的时间。第一次缓冲度量可以判断是否存在web服务器延迟或者网络滞后。
    解析: 暂无解析

  • 第23题:

    单选题
    You noticed that large memory allocations for the Oracle backup and restore operations are causing a performance overhead on the shared pool. Which memory structure would you configure to avoid this performance overhead?()
    A

     recycle buffer cache

    B

     large pool

    C

     streams pool

    D

     keep buffer cache

    E

     redo log buffer


    正确答案: A
    解析: 暂无解析