SAS Certification Prep Guide, 4th Edition

Quiz

Select the best answer for each question. After completing the quiz, check your answers using the answer key in the appendix.

1. Why can using an index reduce the number of I/O operations that are required for accessing a small subset?

   1. Using an index requires larger I/O memory buffers, which can hold more pages.
   2. The index does not have to be loaded into a memory buffer.
   3. The number of observations that SAS has to load into the program data vector (PDV) is decreased.
   4. The number of pages that SAS has to load into I/O buffers is decreased.
2. You want to select a subset of observations in the data set Company.Products, and you have defined a simple index on the variable Rating. SAS cannot use the index to process ...