关于SAS Efficiency的小问题

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The SASFILE statement requests that a SAS
data set be opened and loaded into memory:
A.
one page at a time.
B.
one variable at a time.
C.
one observation at a time.
D.
in its entirety, if possible.


[size=13.3333330154419px]答案是A还是D？个人觉得应该是D，[size=13.4399995803833px]The SASFILE statement opens a SAS data file and allocates enough buffers to hold the entire file in memory
[size=13.4399995803833px]不过答案说什么的都有，所以请大家看看
[size=13.4399995803833px]谢谢！

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关键词：EFFICIENCY Ency ICI 小问题 observation possible memory entire loaded opened

Based on SAS help version 4, it should be D: the whole file.

"The SASFILE statement opens a SAS data set and allocates enough buffers to hold the entire file in memory. Once it is read, data is held in memory, available to subsequent DATA and PROC steps or applications, until either a second SASFILE statement closes the file and frees the buffers or the program ends, which automatically closes the file and frees the buffers."