Okay. You got me there. Though I do have to wonder about the time spent calculating the CRCs (using SQL) relative to transmitting the data. If the machines are connected by a high-speed (10Mbits/s or greater) network connection, I would think it would be a close run thing.

It would be quicker if you could CRC the underlying filesystem entities in which the data is stored, but of course, any difference in the transaction histories, database configurations or versions, or even the disk drives would thrown the comparison out.

And, once you have discovered that there is a difference, you have still to corrected it, and you're right back where you started from needing to transmit the data.

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
Lingua non convalesco, consenesco et abolesco. -- Rule 1 has a caveat! -- Who broke the cabal?
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

In reply to Re^5: Comparing tables over multiple servers by BrowserUk
in thread Comparing tables over multiple servers by mnlight

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