Re: speed of light

From: joel garry <>
Date: Fri, 6 Jun 2008 16:23:27 -0700 (PDT)
Message-ID: <>

On Jun 6, 1:51 pm, DA Morgan <> wrote:

> The settings like SDU are not yet able to change the speed of light.
> But they do significantly affect the transfer speed by optimizing
> the way Oracle uses the network.
> Nor is the speed of light a significant player. We are generally
> limited, according to the literature, to 1ms/50km (33mi for Americans).

Welllllll, maybe the OP is using a fiberoptic, and is limited to the speed of light in fibers, minus replication and net access speeds... 400ms round trip, what does that imply to you? Lessee, 25Kmiles x 4 for a sattellite at 186Kmi/sec... nope, not a geosynchronous satellite...

> When we teach Data Guard classes here we always create a non-public
> network for log file shipping with its own port and its own listener.
> Why compete with public traffic if you can avoid doing so.

So, how do you avoid doing so when going between Australia and the US? :-)

I can't even get a full T1 between two contiguous states <sigh>. Then I remember paying by the mile from LA to SF for running Co-Link over lousy phone lines, and am glad I don't have to worry about these things any more, except as a dirt-scratching DBA.


-- is bogus.
Received on Fri Jun 06 2008 - 18:23:27 CDT

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