• 2022-06-07
    在J2EE中,test.jsp文件如下: <;html>; <;%{%>; <;jsp:useBean id="buffer" scope="page" type="java.lang.StringBuffer"/>; <;% buffer.append("ABC");%>; <;%}%>; buffer is <;%=buffer%>; <;/html>; 运行时,将发生( )。
    A: 编译期错误
    B: 运行期错误
    C: 运行后,浏览器上显示:buffer is null
    D: 运行后,浏览器上显示:buffer is ABC
  • A

    内容

    • 0

      (5)The more concentrated the components of a buffer, the greater the buffer capacity. A: 正确 B: 错误

    • 1

      解析后的SQL语句在SGA中的哪一个组件中进行缓存( )。 A: DATABASE BUFFER B: DATA DICTIONARY BUFFER C: LIBRARY BUFFER D: LARGE POOL

    • 2

      The more the total concentration of a buffer, the more its buffer capacity at 298K. A: 正确 B: 错误

    • 3

      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.

    • 4

      (4)Buffer capacity does not represent the ability of a buffer to resist changes in pH. A: 正确 B: 错误