What is so special about 10ms response speed

Hi friends,

Almost everywhere, we mean that the response time of monobloc in oracle should be < 10ms etc.

Can someone throw light where the value of 10ms is derived, or why it is considered as good enough?

I googled but without success.

Anthony wrote:

Almost everywhere, we mean that the response time of the only block in oracle should be< 10ms="">

Can someone throw light where the value of 10ms is derived, or why it is considered as good enough?

Historically this 10ms used to give because it was in the stage of typical disk latency (seek time and rotational latency).

Some of the most recent published articles tend to use numbers closer to 5 or 6 ms for exactly the same reason. It's a gray area, however, try to choose a number because there a lot of without devices now have caches of large disks that can shorten the time dramatically, and (b) If you begin planning the theory of queues you then increase the time.  That is why v$ event_histogram ( event histograms |) Oracle scratchpad ) is a such nice feature of 10 g - for things like db file sequential bed it allows you to see inputs and outputs which actually came from something like a file system or SAN cache and then the distribution of the moment for the e/s which really necessary disk visits - and in a reasonably busy on modern disks system you probably hope that the latter would show you a model centered round 10-12ms with a tail up to about 30 Ms.

Concerning

Jonathan Lewis

Now on twitter @jloracle

Tags: Database

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