Re: 9i standby

Mark Leith wrote:

> No it is not the upgrade of OPS as I understand. They even put OPS down
> themselves saying that it was sparsely used, and far to complicated to set
> up.

Th king is dead; long live the king! OPS was sparsely used, so they renamed it. I'm reading a book about the Communist system and the KGB in the USSR, and this sounds vaguely familiar.

>
> What RAC does, is essentially link every machine together in to a "cluster",
> then each physical machine can touch the same database concurrently
> (probably on a central storage unit). There is no actual "standby" when this
> is in use, as all machines connected to the cluster work together - but if
> one of the machines has a hardware failure, the load is simply spread
> between the remaining machines..

Which is exactly what OPS did. You had several machines linked to a centrally stored db. One wen't down, the others picked up the slack.

A fat lot I know, I never used it. But I'm pretty sure that's what OPS was all about. I'm sure they've added some functionality. At least, I *hope* they've added some functionality.

When the central storage goes down, the RAC instances have nothing to run against. That's where standby comes in. It duplicates the central storage.

As I said, I've never done either of these, AND I'm unemployed. So I MUST be an expert!

Have a great weekend.

Yosi

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