42_________A. musicB. audienceC. curtainD. stage

4． He is a good _________ He likes ________very much．

A． music，music

B． musician，musician

C． music，musician

D． musician，music

Consider the query:Mysql＞ SET @run = 15;Mysql＞ EXPLAIN SELECT objective, stage, COUNT (stage)FROM iteminformationWHERE run=@run AND objective=’7.1’GROUP BY objective,stageORDER BY stage;The iteminformation table has the following indexes;Mysql＞ SHOW INDEXES FROM iteminformation:This query is run several times in an application with different values in the WHERE clause in a growing data set.What is the primary improvement that can be made for this scenario?（）

A.Do not pass a user variable in the WHERE clause because it limits the ability of the optimizer to use indexes

B.Add an index on the objective column so that is can be used in both the WHERE and GROUP BY operations

C.Drop the run_2 index because it has caused a conflict in the choice of key for this query

D.Execute the run_2 index because it has caused a conflict in the choice of key for this query

E.Add a composite index on (run,objective,stage) to allow the query to fully utilize an index

在一个cluster环境中，4个managed server在4个机器上，没有共享的文件系统。如果 部署应用，可以怎么做?()

A. 用stage方式在cluster里部署

B. 用external-stage部署，手工copy文件到stage目录下

C. a or b

A.alive

B.live

在Bootloader的stage1中，以下各步骤的顺序应为：（）。 A.跳转到stage2的C程序入口点 B.为加载stage2准备RAM空间 C.拷贝stage2的执行代码到RAM空间中 D.基本硬件初始化

A.2413

B.4231

C.4213

D.4321