Registration database is a shared resource.
We must expect and plan for the likelihood that
several users will attempt to access and
manipulate data at the same time. With
concurrent processing involving updates, a
database without concurency control will be
compromised due to interference between users.
Concurrency control allows many users to
access and update the database simultaneously
while preventing partially completed updates
from happening. This techniquei s essentiatlo
our registration database, such as when more