If you are not using windowing, you need to decide how to
handle your historic data. If you are bound by some constraint to
make no changes to them, your "choice" would be 2.:
- Expand or compress all old files and databases or
- Keep copies of old data, in which case you need to decide
whether to:
- Keep copies of old code to access the data or
- Your code needs to handle both 2-digit and
4-digit year
Could use condition bridges when accessing old
data
©1997 IBM Corporation