RE: resource manager throttles maintenance jobs
Date: Mon, 14 Sep 2020 13:56:06 +0000
Message-ID: <27070_1600091787_5F5F768B_27070_10976_1_b92ab37d679c4c519622d43770015b21_at_vontobel.com>
Would anybody know if the vktm bg process is involved in the CPU-timekeeping of the MMON slaves?
Best regards,
Nenad
From: oracle-l-bounce_at_freelists.org <oracle-l-bounce_at_freelists.org> On Behalf Of Noveljic Nenad
Sent: Montag, 22. Juni 2020 10:40
To: ORACLE-L (oracle-l_at_freelists.org) <oracle-l_at_freelists.org>
Subject: resource manager throttles maintenance jobs
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/
Please consider the environment before printing this e-mail. Bitte denken Sie an die Umwelt, bevor Sie dieses E-Mail drucken.
Important Notice
This message is intended only for the individual named. It may contain confidential or privileged information. If you are not the named addressee you should in particular not disseminate, distribute, modify or copy this e-mail. Please notify the sender immediately by e-mail, if you have received this message by mistake and delete it from your system. Without prejudice to any contractual agreements between you and us which shall prevail in any case, we take it as your authorization to correspond with you by e-mail if you send us messages by e-mail. However, we reserve the right not to execute orders and instructions transmitted by e-mail at any time and without further explanation. E-mail transmission may not be secure or error-free as information could be intercepted, corrupted, lost, destroyed, arrive late or incomplete. Also processing of incoming e-mails cannot be guaranteed. All liability of Vontobel Holding Ltd. and any of its affiliates (hereinafter collectively referred to as "Vontobel Group") for any damages resulting from e-mail use is excluded. You are advised that urgent and time sensitive messages should not be sent by e-mail and if verification is required please request a printed version. Please note that all e-mail communications to and from the Vontobel Group are subject to electronic storage and review by Vontobel Group. Unless stated to the contrary and without prejudice to any contractual agreements between you and Vontobel Group which shall prevail in any case, e-mail-communication is for informational purposes only and is not intended as an offer or solicitation for the purchase or sale of any financial instrument or as an official confirmation of any transaction. The legal basis for the processing of your personal data is the legitimate interest to develop a commercial relationship with you, as well as your consent to forward you commercial communications. You can exercise, at any time and under the terms established under current regulation, your rights. If you prefer not to receive any further communications, please contact your client relationship manager if you are a client of Vontobel Group or notify the sender. Please note for an exact reference to the affected group entity the corporate e-mail signature. For further information about data privacy at Vontobel Group please consult www.vontobel.com<https://www.vontobel.com>.
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<style type="text/css">p { font-family: Arial;font-size:9pt }</style>
</head>
<body>
<p>
<br>Important Notice</br>
<br />
This message is intended only for the individual named. It may contain confidential or privileged information. If you are not the named addressee you should in particular not disseminate, distribute, modify or copy this e-mail. Please notify the sender immediately by e-mail, if you have received this message by mistake and delete it from your system.<br />
Without prejudice to any contractual agreements between you and us which shall prevail in any case, we take it as your authorization to correspond with you by e-mail if you send us messages by e-mail. However, we reserve the right not to execute orders and instructions transmitted by e-mail at any time and without further explanation.<br />
E-mail transmission may not be secure or error-free as information could be intercepted, corrupted, lost, destroyed, arrive late or incomplete. Also processing of incoming e-mails cannot be guaranteed. All liability of Vontobel Holding Ltd. and any of its affiliates (hereinafter collectively referred to as "Vontobel Group") for any damages resulting from e-mail use is excluded. You are advised that urgent and time sensitive messages should not be sent by e-mail and if verification is required please request a printed version.</br>
Please note that all e-mail communications to and from the Vontobel Group are subject to electronic storage and review by Vontobel Group. Unless stated to the contrary and without prejudice to any contractual agreements between you and Vontobel Group which shall prevail in any case, e-mail-communication is for informational purposes only and is not intended as an offer or solicitation for the purchase or sale of any financial instrument or as an official confirmation of any transaction.<br />
The legal basis for the processing of your personal data is the legitimate interest to develop a commercial relationship with you, as well as your consent to forward you commercial communications. You can exercise, at any time and under the terms established under current regulation, your rights. If you prefer not to receive any further communications, please contact your client relationship manager if you are a client of Vontobel Group or notify the sender.
Please note for an exact reference to the affected group entity the corporate e-mail signature.
For further information about data privacy at Vontobel Group please consult <a href="https://www.vontobel.com">www.vontobel.com</a>.<br />
</p>
</body>
</html>
-- http://www.freelists.org/webpage/oracle-lReceived on Mon Sep 14 2020 - 15:56:06 CEST