You have executed this command to change the size of the database buffer cache: SQL> ALTER SYSTEM SET DB_CACHE_SIZE=2516582; System altered. To verify the change in size, you executed this command:SQL> SHOW PARAMETER DB_CACHE_SIZENAME TYPE VALUE ------------------- ----------- ------------------ db_cache_size big integer 4194304 Why is the value set to 4194304 and not to 2516582()
A、Because 4194304 is the granule size
B、Because 4194304 is the standard block size
C、Because 4194304 is the largest nonstandard block size defined in the database
D、Because 4194304 is the total size of data already available in the database buffer cache
Which two operations can be performed on an external table()
ACreate a view on the table.
BCreate an index on the table.
CCreate a synonym on the table.
DAdd a virtual column to the table.
EUpdate the table using the UPDATE statement.
FDelete rows in the table using the DELETE command
下三角矩阵A[0..8,0..8]如下图所示,若将其下三角元素(即行下标不小于列下标的所有元素)按列压缩存储在数组M[0..m]中,即A[0,0]存储在M[0]、A[1,0]存储在M[1]、A[2,0]存储在M[2],…,A[8,8]存储在M[44],则元素A[5,5]存储在__(1)__。若将其下三角元素按行压缩存储在数组M[0..m]中,即A[0,0]存储在M[0]、A[1,0]存储在M[1]、A[1,1]存储在M[2],…,A[8,8]存储在M[44],则元素A[5,5]存储在__(2)__。空白(2)处应选择()
A、M[15]
B、M[20]
C、M[35]
D、M[39]
患者,男性,68岁,心房颤动20年,服用地高辛控制心室率5年,近3天患者突然出现恶心、呕吐等消化道症状,饲时伴有心悸、头痛、头晕症状,视物模糊,查心电图:室性期前收缩二联律,该患者可能是发生了()
A、消化性溃疡
B、心绞痛
C、低血压
D、高血压
E、洋地黄类药物中毒
删除当前工作表中某行的正确操作步骤是,选定该行,()。
A、按[Delete]键
B、执行“编辑→清除”菜单命令
C、执行“编辑→剪切”菜单命令
D、执行“编辑→删除”菜单命令
A bank wants to maximize the security of employee computer data displayed on their screen.Which of the following would BEST accomplish these goals?()
A、Keyboard filters
B、Privacy filters
C、Screensavers
D、Secure display drivers