resource manager throttles maintenance jobs
Date: Mon, 22 Jun 2020 08:40:03 +0000
Message-ID: <20244_1592815223_5EF06E77_20244_4214_1_97ab1e9290a940e08ba35efcf55176e3_at_vontobel.com>
The resource manager massively throttled the maintenance jobs:
SQL> _at_dash_wait_chains2 "event2||' '||module" 1=1 "to_date('2020-06-20 06:00:00')" "to_date('2020-06-21 02:10:00')"
- Display ASH Wait Chain Signatures script v0.5 BETA by Tanel Poder ( http://blog.tanelpoder.com )
%This SECONDS AAS WAIT_CHAIN FIRST_SEEN LAST_SEEN ------ ---------- ---------- ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ ------------------- ------------------- 95% 216720 3 -> resmgr:cpu quantum MMON_SLAVE 2020-06-20 23:08:52 2020-06-21 02:00:55 5% 10320 .1 -> cursor: pin S wait on X DBMS_SCHEDULER -> resmgr:cpu quantum MMON_SLAVE 2020-06-20 23:08:52 2020-06-21 02:00:55 0% 200 0 -> ON CPU 2020-06-20 23:14:53 2020-06-21 02:03:05 0% 20 0 -> control file parallel write 2020-06-20 23:43:25 2020-06-21 01:32:23 0% 10 0 -> ON CPU MMON_SLAVE 2020-06-21 02:02:55 2020-06-21 02:02:55
In fact, they didn't get any CPU time!
This happened during the DEFAULT_MAINTENANCE_PLAN window:
2020-06-20T06:00:56.153014+02:00
Setting Resource Manager plan SCHEDULER[0x3194]:DEFAULT_MAINTENANCE_PLAN via scheduler window
Setting Resource Manager plan DEFAULT_MAINTENANCE_PLAN via parameter
2020-06-21T02:00:56.159875+02:00
Closing scheduler window
Closing Resource Manager plan via scheduler window
Clearing Resource Manager plan via parameter
Plan directives are default for DEFAULT_MAINTENANCE_PLAN:
select group_or_subplan,cpu_p1 from DBA_RSRC_PLAN_DIRECTIVES 2 where plan='DEFAULT_MAINTENANCE_PLAN' ;
GROUP_OR_SUBPLAN CPU_P1 -------------------------------------------------------------------------------------------------------------------------------- ---------- SYS_GROUP 75 OTHER_GROUPS 20 ORA$AUTOTASK 5
The database version is 18.7:
SQL> !dbhome
/u00/oracle/orabase/product/18.7.0.0.190716_a
Why didn't resource manager allow the maintenance jobs to use CPU?
Best regards,
Nenad
https://nenadnoveljic.com/blog/
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