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Software-as-a-Service (SaaS) is a service model for delivering application as cloud services over the internet on subscription basis to multiple clients. This has forced the use of shared databases termed as multitenant databases. Multitenancy refers to a technology where a single instance of application serves requests from multiple clients. The word Tenant refers to a single organization (eg. an Institution) or person. In our proposed approach, shared database shared schema approach has been proposed that offers larger number of tenants (Educational Institutions) per database server as the single database serves the database requirements of multiple Institutions. Authentication and authorization are prime requirements when dealing with multitenancy. Kerberos authentication protocol is used on the top of multitenant database for participating educational institution in a heterogeneous environment, where a tenant can also voluntarily participate in the data centre.