I have a database A in Server 1
data size is 1200MB. data space available is 655MB. I calculated the actual size of the 1200-655 = 545 MB.

Is this correct?

First I backup this database A and restored to another database B in Server 2.
The database B size is 612 MB.

Then I used data transfer to transfer database A to database C in Server 2.
The database C size is 200 MB.

Why those three database have different size? Is it normal?

How can I compare two database to know they are same?



Thanks in advance.


Jim