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1 Reply Latest reply: Jan 28, 2013 4:39 AM by bas_ua RSS

Instance throughput rate

bas_ua Newbie
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Hi!

I curiose of Oracle Enterprise Manager dbconsole realtime statistics that apear in "Instance throughput rate".
Specifically - "Instance throughput rate -> Physical reads(Kb)" and "I/O -> I/O Megabytes per Second by I/O Function" at the bottom of Performance page.
I think that "Physical reads" in "Instance throughput rate" tab must be equal to sum of "Direct reads" and "Buffer cache reads" in I/O tab... But they are NOT equal.
In my case for example Direct reads = 40 MBps, Buffer Cache reads = 5 MBps. But "Physical reads" in "Instance throughput rate" tab shows up to 160 MBps at the same time. NMON shows numbers close to I/O tab stats.
What it means?

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