1. A computer program product embodied on a non-transit computer readable medium, comprising: computer code for storing a single instance of a database used by a first tenant of a multi-tenant on-demand database system by storing the single instance of the database in a location in memory of the multi-tenant on-demand database system that is dedicated to only the first tenant; and computer code for allowing at least one second tenant of the multi-tenant on-demand database system to access the single instance of the database, such that: the at least one second tenant of the multi-tenant on-demand database system is allowed to perform one or more queries on the single instance of the database for retrieving data stored in the sin le instance of the database, the first tenant is able to alter data stored in the single instance of the database, and the at least one second tenant is prevented front altering the data stored in the single instance of the database.