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save your work
Programs produce data
It’s a rare program that reads data from a disk file, processes the data, and
then throws away the processed data. Typically, programs save the data they
process, display their output on screen, or transfer data over a network.
You have lots of choices
about which type of disk
file to use.
Your data is ready.
Where should I put it
for you?
DBMS
Hey, that’s nice
output...exactly
what I want.
Before you learn what’s involved in writing data to disk, let’s process the data
from the previous chapter to work out who said what to whom.
When that’s done, you’ll have something worth saving.
106 Chapter 4
