Consistency

 Consistency

example: Bank Balance not yet updated , it is still showing balance to be zero.

Here User 1 and User 2 must get same data ,inorder to be consistent.

When more than one client requests the system, for all such requests, it will be called consistent when each client gets the same data. The data should always be consistent ,regardless of who is accessing it.

Here Bank Balance is inconsistent as after cash deposit it should show balance of amount 100 not of amount 0.

When more than one client request the system , for all such requests, when different clients get different responses due to some recent updates that has not been committed to all system yet, this read operation will be called dirty read.