| Percentage of CPU utilization per instance [message #684729] |
Thu, 05 August 2021 08:38  |
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db_senior
Messages: 13
Registered: July 2021
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Junior Member |
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Hi,
My Oracle version is: Oracle Database 11g and 12c EE on Oracle Linux 6.10 (Exadata Machine)
On DB Server there are 20 instances and our databases are configured with Oracle RAC option (2 nodes).
We are trying to do an analysis of CPU utilization (%) per Oracle database instance (not HOST).
I'm using the following query:
Quote:
select to_char(begin_time, 'yyyy/mm/dd')||' '||to_char(begin_time, 'hh24:mi') data_time,
to_char(begin_time, 'hh24:mi') begin_time,
to_char(end_time, 'hh24:mi') end_time,
round(average,2) avgval,
round(maxval,2) maxval, snap_id
From DBA_HIST_SYSMETRIC_SUMMARY
where metric_name='Host CPU Utilization (%)'
and instance_number = 1 ----and instance_number = 2
order by 1 desc,3
unfortunately isn't useful for providing information on CPU (%) per single instance.
Can you tell me How can provide information of the CPU usage (%) per database instance?
Thanks!
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| Re: Percentage of CPU utilization per instance [message #684731 is a reply to message #684729] |
Thu, 05 August 2021 12:25  |
John Watson
Messages: 8783
Registered: January 2010
Location: Global Village
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Senior Member |
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The AWR report for your old 11g has a section "Instance CPU", doesn't that give you what you need? Release 12.x reports have more info which will certainly answer your question. If you don't have the diag pack licence, try a statspack report - it has similar information.
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| Re: Percentage of CPU utilization per instance [message #686308 is a reply to message #684735] |
Sat, 23 July 2022 07:14 |
Andrey_R
Messages: 409
Registered: January 2012
Location: Israel
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Senior Member |
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db_senior wrote on Fri, 06 August 2021 09:12John Watson wrote on Fri, 06 August 2021 01:00So generate seven reports, one for each day.
I'd like to have a report with the cpu that provide a trend of last 7 day every hour, so I should create 7x24 = 168 AWR reports
Lets say you want to take 1st augugst 08:00 AM to 8th of August 08:00 AM
You make sure you have enough retention for the AWR to retain snapshots of 1 week
Then you produce a SINGLE AWR from BEGIN Snapshot of 1st of August and END Snapshot of 8th of August.
Andrey
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