The descriptor portion
of an uncompressed data file is always stored at the end of the first
data set page. New observations are always added to the end of the
data set, and deleted observation space is neither tracked nor reused.
Correct answer: b
The descriptor portion
of a compressed data file is always stored at the end of the first
data set page. If you specify REUSE=YES, SAS tracks and reuses deleted
observation space within a compressed data file. Therefore, every
observation in a compressed data file can be a different size. Compressed
data files do have a larger overhead than uncompressed data files.
Correct answer: c
Use the LENGTH statement
to assign a reduced length to a numeric variable. If you do not use
the LENGTH statement to define a reduced length for numeric variables,
their default length is 8 bytes. The FORMAT statement associates a
format with a variable, and the INFORMAT statement associates an informat
with a variable.
Correct answer: a
SAS data views use significantly
less disk space than SAS data files. However, SAS data views might
need more CPU resources than SAS data files. You can create a SAS
data view in either the temporary SAS library or in a permanent SAS
library.
Correct answer: b
Use the COMPARE procedure
to detect any differences in the values of two data sets. The COMPARE
statement is not valid syntax in either the CONTENTS procedure or
the DATASETS procedure. Printing both data sets might not reveal differences
in the precise values of the shortened variables, depending on the
formats that are used.