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Message Posted: Fri, 07 Dec 2007 @ 17:05:34 GMT

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<-- Anonymously Posted: 7 Dec 2007 09:30 -->

Using SRDF or any array-based backup strategy with a "parallel" DBMS is quite difficult. How do you establish a "consistency point" across all those asynchronous units of parallelism, short of shutting down the database?

And unless you are willing to keep the database "down" until you ensure a good copy of the entire system, how would you return to that consistent point when you restore the image? No matter how fast the copy is (even just "breaking the mirror") it won't be truly simultaneous across multiple drives, controllers, arrays.

Several non-parallel DBMS's provide some enabling features for this technology. I don't know if any other parallel DBMS does. Teradata currently does not.

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