If I create a script that allows multiple people to sign up for accounts, is it ok if they use the same database?
http://www.campaignmonitor.com is an email mailout software that allows you to signup and create newsletters, add subscribers etc. That must mean they would have millions of records in their database from all their accounts.
Would a site like campaign monitor use just one database to store all their information or would they need multiple databases? What is the best way to approach this?