SAS Chapter 21: Controlling Data Storage Space

The descriptor portion is stored on whatever page has enough room for it.

New observations are always added in the first sufficient available space.

Deleted observation space is tracked.

New observations are always added at the end of the data set.

SAS data views use less disk space but more CPU resources than SAS data files.

SAS data views can be created only in permanent SAS data libraries.

SAS data views use less CPU resources but more disk space than SAS data files.

SAS data views can be created only in temporary SAS data libraries.

data temp; infile file1; input x 4. y 3. z 2.; run;

data temp; format x 4. y 3. z 2.; infile file1; input x 4. y 3. z 2.; run;

data temp; length x 4 y 3 z 2; infile file1; input x 4. y 3. z 2.; run;

data temp; informat x 4. y 3. z 2.; infile file1; input x 4. y 3. z 2.; run;

proc contents data=company.regular; compare data=company.reduced; run;

proc compare base=company.regular compare=company.reduced; run;

proc print data=company.regular; run; proc print data=company.reduced; run;

proc datasets library=company; contents data=regular compare=reduced; run;