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Mahesh K 22Mahesh K 22 

i would like to know salesforce architecture

Shalom RubdiShalom Rubdi
Mahesh - please refer to the following link, which contains ERDs for all the standard Salesforce objects:
NagendraNagendra (Salesforce Developers) 
Hi Mahesh,

Multi-tenant systems place the data from multiple companies (org in Salesforce) on the same server, generally separating them from each other via a simple partition that prevents the data from migrating from one company to another.  There are various benefits of multi-tenancy including cost savings, no upgrades headache for the client (and faster and smoother upgrade for vendor), flexibility, scalability, high performance, low operational costs etc. Salesforce.com is based on multi-tenant architecture and it works pretty well.

In other words it is where a single instance of the software runs on a server, serving multiple client organizations (tenants). Its like an apartment building where all residents/tenants share the space or portions with each other. Just like a tenant does not own the house he is living in, a cloud tenant also does not own the data. He is simply paying for the data storage of his data elsewhere.  

For more information about Multi-tenancy you can refer to:
For more information about Salesforce Multi-tenant architecture you may refer to:
Please mark this as best answer if it helps.

Best Regards,