You perform the following activities during the database upgrade from Oracle Database 10g to Oracle Database 11g: 1. Capture plans for a SQL workload into a SQL Tuning Set (STS) before upgrade. 2. Load these plans from the STS into the SQL plan baseline immediately after the upgrade. What is the reason for performing these activities? ()
A、to minimize plan regression due to the use of a new optimizer version
B、to completely avoid the use of new plans generated by a new optimizer version
C、to prevent plan capturing when the SQL statement is executed after the database upgrade
D、to keep the plan in the plan history so that it can be used when the older version of the optimizer is used
应该在()阶段制定系统测试计划。
A、需求分析
B、概要设计
C、详细设计
D、系统测试
关于遮罩动画说法正确的是()
A、必须在遮罩做动画效果
B、必须在被遮罩做动画效果
C、在遮罩和被遮罩层都可以做动画效果
D、在遮罩和被遮罩层都要做动画效果
在Excel2010的一个工作表的某一个单元格中,若要输入公式2008-4-5,则正确的输入为()。
A、2008-4-5
B、=2008-4-5
C、‘2008-4-5
D、2008-4-5
第二代加密锁的特点是“软硬”兼施的策略,下列关于“软硬”的描述正确的是。()
A“软”即是软加密,“硬”即是硬加密
B“硬”指算法功能,解密者无法求解算法方程,也无法穷举算法变换,这大大增加了解密难度,这是掌握在加密厂商手中的武器
C均不对
D“软”驱动程序内增加反跟踪、外壳加密等等软件工作,让解密者难以在功能层上捕捉到数据或者即使获取了也无法仿真。
Data is transferred between two servers using NFS, where one server is configured with token ring, and the other system is configured with ethernet. It is discovered that the performance is greatly reduced during this transfer. Which of the following steps should be taken to improve performance?()
A、 Reduce MTU on token ring system to match ethernet system using ifconfig command (i.e. ifconfig tr0 mtu 1500)
B、 Reduce MTU on token ring system to match ethernet system using no command (i.e. no -o mtu=1500)
C、 Increase MTU on ethernet system to match token ring system using ifconfig command (i.e. ifconfig en0 mtu 4096)
D、 Increase MTU on ethernet system to match token ring system using no command (i.e. no -o mtu=4096)