在B +树中，如果搜索键值长8个字节，块大小为512个字节，块指针为2个字节，则B +树的最大顺序为____。
注意：此问题显示为“数值答案类型”。
(A) 51
(B) 52
(C) 53
(D) 54答案： (B)
解释：
Order of a B+ tree node is maximum number of children
in an internal node
Let the order be x. Number of keys in a node is equal to
number children minus 1.
So a full node has (x-1) keys and x children.
(x-1)*(search key) + x * block ptr <= block size
==> (x-1)*8 + x*2 <= 512
==> 10x <= 520
==> x <= 52这个问题的测验