How do you change the format of a database without causing issues with old data that is used?

I hava a database that has over 230 questions. So now I am in the process of making the database the correct way. The problem is Im not sure how to deal with the old data.
The users are constantly transfering the data back and forth. Adding and editing data they receive.

Any suggestions on how I should approach this experts will be apreciated


Old DB
Fields Question1
Fields Question 2
Fields "              "

New DB
Fields QID
Fields Questions


Field YES/No
Field Inspectors
Field DateInspection

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Jim Dettman (Microsoft MVP/ EE MVE)President / OwnerCommented:
You have to write a conversion process as a one-time deal (or do the work manually).

Jeffrey CoachmanMIS LiasonCommented:
Yes, there is no easy way to change the basic table design while the users are currently inputting data into the old design.

There are a lot of unknowns here, but in the most basic sense you could:

Create a separate database with the correct design (with fake data)
Then test this design *Fully*
Then create a system to migrate the old data to the new system (again, create a system to do this with Fake data, and test it *fully*)

Make sure you have a backup of the original database!
Then pick a day and deny all access to all database files until the conversion is complete.
Migrate the data using your system.
Test the converted database *fully*, then redistribute the db...

Again, There are a lot of unknowns here, so do not take this as gospel...

Like both previous comments.
1- You need parallel run.
     New database
     Process to transfer old to new
     Enter data in old, and in parallel in new
2- check data in both old and new and make sure all is going fine
3- During a vacation day, stop old database, and publish new for online usage.

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gigifarrowAuthor Commented:
Thank you for all your suggestions. I was trying to attach a example but It would not updload for some reasons.
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