Home » RDBMS Server » Performance Tuning » Physical read IO requests higher than total (12.2, Linux 64)
Physical read IO requests higher than total [message #681978] Tue, 22 September 2020 12:36 Go to next message
pallen38
Messages: 4
Registered: September 2020
Junior Member
I must be missing something really dumb, but I can't figure out why "Physical read IO requests" would be higher than "Physical read total IO requests." For instance:

physical read IO requests 380,456,786 10,560.10 1,041.47
physical read total IO requests 230,868,337 6,408.07 631.98

Even the documentation says that "physical read IO request" is supposed to be a subset of "total."

What am I missing?

Thanks!

Patrick
Re: Physical read IO requests higher than total [message #681979 is a reply to message #681978] Tue, 22 September 2020 13:01 Go to previous messageGo to next message
Michel Cadot
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Registered: March 2007
Location: Nanterre, France, http://...
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Welcome to the forum.
Please read the OraFAQ Forum Guide and How to use [code] tags and make your code easier to read.
Indent the code, use code tags and align the columns in result.

Also always post your Oracle version, with 4 decimals (query v$version), as often solution depends on it.

Provide the query you used.

Re: Physical read IO requests higher than total [message #681980 is a reply to message #681978] Tue, 22 September 2020 13:09 Go to previous messageGo to next message
pallen38
Messages: 4
Registered: September 2020
Junior Member
Sorry, my version is 12.1.0.2.0 and this is on Linux (64 bit)
Re: Physical read IO requests higher than total [message #681981 is a reply to message #681980] Tue, 22 September 2020 14:05 Go to previous messageGo to next message
Michel Cadot
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And your query was?

Re: Physical read IO requests higher than total [message #681982 is a reply to message #681981] Tue, 22 September 2020 14:10 Go to previous messageGo to next message
pallen38
Messages: 4
Registered: September 2020
Junior Member
There were a lot of queries - this was an AWR report over 10 hours.
Re: Physical read IO requests higher than total [message #681983 is a reply to message #681982] Tue, 22 September 2020 14:32 Go to previous messageGo to next message
Michel Cadot
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I meant the query that gave the result you posted.

Or post the extract of the AWR report which shows these figures.


[Updated on: Tue, 22 September 2020 14:33]

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Re: Physical read IO requests higher than total [message #681984 is a reply to message #681983] Tue, 22 September 2020 14:56 Go to previous message
pallen38
Messages: 4
Registered: September 2020
Junior Member
I have attached the portion of the AWR that has the relevant info. If more is needed let me know, and I will work on anonymizing the rest.

The part I have a hard time understanding is the physical IO requests:

physical read IO requests..........380,456,786
physical read total IO requests...230,868,337
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