Data flow diagram on a monitor system..Plz Help!

Greetings everyone,

i dnt knw if this is the right forum to post in im just new, but i was wondering if any of u can be of great assistance to me..Im kinda stuck here with creating this data flow diagram on a maintenance company im researching on. I need sample flow charts if there are any because ive searched everywhere and had a hard time finding.

I need to have a perfect example of a data flow diagram where the the employees within the company monitor the products/services along with the employee and customer info involved with purchase of products and what not. So basically in other words, a data flow diagram on a monitor system used especially for the employees in the firm.

Thank u very much for ur time and i hope anyone can provide me with something beneficial.

whats this got to do with oracle?