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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