User Guide

60
Chapter 3
Actions that cre ate one or more columns of data in temporary disk space include:
 Computing new variables
 Recoding existing variables
 Running procedures that create or modify variables (for example, saving
predicted va
lues in Linear Regression)
Actions that
create an entire copy of the data file in temporary disk space include:
 Reading Exc
el files
 Running pro
cedures that sort data (for example, Sort Cases, Split File)
 Reading dat
awith
GET TRANSLATE or DATA LIST commands
 Using the Ca
che Data facility or the
CACHE command
 Launching o
ther applications from SPSS that read the data file (for example,
AnswerTree, DecisionTime)
Note:TheGET
DATA
command provides functionality comparable to DATA LIST
without creating an entire copy of the data file in temporary disk space. The SPLIT
FILE
command in command syntax does not sort the data file and therefore does
not create a
copy of the data file. This command, however, requires sorted data for
proper operation, and the dialog box interface for this procedure will automatically
sort the data file, resulting in a complete copy of the data file. (Command syntax is
not availa
ble with the Student Version.)
Actions th
at create an entire copy of the data file by default
:
 Reading d
atabases with the Database Wizard
 Reading t
ext files with the Text Wizard
The Text Wizard provide an optional setting to automatically cache the data. By
default, this option is selected. You can turn it off by deselecting
Cache data locally.
For the Dat
abase Wizard you can paste the generated command syntax and delete
the
CACHE command.