We have a client that has a web application that is accessed by multiple customers. They are using one database to store all data for all customers. One potential customer is concerned about storing the data this way. They are worried that their data could be accessed by other customers.

Our client has asked us to come up with a list of pros and cons of storing all customers data in the same database. We have brainstormed and came up with a few. Can any of you offer your thoughts?