No that is not possible. In fact there’s a Jackrabbit JCR (software) layer in between the CMS and the (one) database. Also sites use that layer, not the actual CMS.
Jeroen
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Thank you for your reply 
we have N customers and N websites we want to develop these websites with same cms
How can we do it?
The best way to do this ?( create new channel for every customers or Add a Second Delivery Webapp
for every customers )