bjbj I don’t want to spend more than a few
minutes talking about the hardware inside the Database Machine. There s plenty of material
that you can find that will give you full details of all of that. So, in just a couple
of minutes, just to set the scene for what s going to come next, the Database Machine
is a single box with vast amounts of CPU, memory, an astronomical amount of disk space
and all the network bandwidth you might need. If the facilities of one machine are not enough
for you, you can chain several together. The hardware is designed so that it can withstand
failure of virtually every component, virtually any components, and your database will remain
open. One user shouldn t know any difference. It s particularly important to mention here
that generally speaking, the machine is designed to continue operating at the same performance
levels even if a component fails. There is redundancy at virtually every point. There
are one or two single points of failure. I wouldn t worry too much about that. The box,
it is only a single box, and there are limitations to what you can do with just one box. If you
really must have 100% percent uptime under all circumstances, then you would need two
Database Machines and typically use Data Guard to replicate between them. Important to mention
is a balance configuration. Oracle is going to a lot of trouble to make sure that all
the components work together. You should not find, for example, that the disks can deliver
data faster than the network can transmit it onwards. It s configured out of the box
well, it is a box. Some people actually find this a bit annoying. You are not allowed to
install any other hardware in the machine. I m sure you could, but if you were to do
so, it would take you out of the supported configuration. There s all sorts of facilities
for *. There are quite a few * stories of some engineers turning up at a customer site
and saying, Hey, I ve come to mend your Database Machine, and the customer says, Why? We haven
t noticed that there was anything wrong with it. The old * machine could * if you link
it up to My Oracle Support is pretty good. If there are grid control modules — by the
way, if using grid control, there are grid control plug-ins for all the various components.
Now, that s all very well, but it s hardly unique. There are other boxes of similar capacity,
and it s worth mentioning at this point the Database Appliance. The Database Appliance
is a similarly powerful and similarly well-balanced machine. So what distinguishes the Database
Machine from anything else is the software that you run on it. PAGE PAGE &`#$ gdnn &`#$ gdnn
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