| I/O performance problem [message #683665] |
Thu, 11 February 2021 15:04  |
JackBauer
Messages: 24
Registered: February 2021
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Junior Member |
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Hello,
We are trying to debug an I/O performance issue.
We have detected a lot of I/O in cloud control in the last 2 days in one of our DBs.
In an AWR, what section should we check first for I/O problems?
It should be the section about SQL ordered by User I/O right?
Would we get any valuable info by comparing the SQL ordered by gets between 2 different periods? One doing well and another one doing bad for troubleshooting I/O?
Thanks
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| Re: I/O performance problem [message #683671 is a reply to message #683665] |
Fri, 12 February 2021 02:25  |
John Watson
Messages: 8989
Registered: January 2010
Location: Global Village
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Senior Member |
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Jack, you are approaching this from the wrong direction. I/O is not a performance issue. For example, I do not think that your users are telephoning you to complain that Cloud Control is reporting too much I/O. What are they complaining about? Is it, for example, that a screen takes too long to refresh? Or that the overnight batch jobs don't finish until lunchtime? If you can identify a problem (in business terms - something that affects users) then you can investigate it. Just looking at an AWR report and finding a figure that you do not like is not the way to go.
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