The resource manager massively throttled the maintenance jobs:
SQL> @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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