A customer has requested a proposal for a p5-520 with AIX 5.2 and Sysback. There are no plans to run LPARs or Micro-Partitions on the p5-520 in the near future. The customer has asked the pSeries technical specialist to recommend anything else that may be needed. Which of the following should be recommended in this situation？（）
A、HMC
B、DVD-ROM
C、Tape drive
D、Network switch
在下列关系运算中，不改变关系表中的属性个数但能减少元组个数的是（ ）。
A、并
B、交
C、投影
D、除
（1）的选择是开发一个软件系统时的基本设计决策；（2）是最底层的模式，关注软件系统的设计与实现，描述了如何实现构件及构件之间的关系。引用计数是C++管理动态资源时常用的一种（3）。空白（3）处应选择（）
A、架构模式
B、惯用法
C、设计模式
D、分析模式
架构复审是基于架构开发中一个重要的环节。以下关于架构复审的叙述中，错误的是（）
A、架构复审的目标是标识潜在的风险，及早发现架构设计的缺陷和错误
B、架构复审过程中，通常会对一个可运行的最小化系统进行架构评估和测试
C、架构复审人员由系统设计与开发人员组成
D、架构设计、文档化和复审是一个迭代的过程
Examine the following command: SQL> ALTER TABLE booking SHRINK SPACE COMPACT; Which activity is performed when the preceding command is executed?（）
A、The shrink operation touches every block in the BOOKING table
B、The high-water mark (HWM) for the BOOKING table is shifted from its original position
C、The progress of the shrink operation is saved in the bitmap blocks of the BOOKING table
D、The data manipulation language (DML) triggers on the BOOKING table are executed because the shrink operation is internally handled by the INSERT/DELETE operation
Which is the source used by Automatic SQL Tuning that runs as part of the AUTOTASK framework? （）
A、SQL statements that are part of the AWR baseline only
B、SQL statements based on the AWR top SQL identification
C、SQL statements that are part of the available SQL Tuning Set (STS) only
D、SQL statements that are available in the cursor cache and executed by a user other than SYS
