Re: select from ts$ in v$undostat.maxqueryid
Date: Tue, 4 Feb 2020 16:10:56 +0000
Message-ID: <LNXP265MB1562E39911D1AE5580359319A5030_at_LNXP265MB1562.GBRP265.PROD.OUTLOOK.COM>
I've been prodding the boundaries of what and when v$undostat reports (on a 12.2 instance) https://jonathanlewis.wordpress.com/2020/02/04/maxquerylen/ and it doesn't seem to be entirely consistent in what it notices and how it reports it. and no doubt there are odd side effects of concurrency that I haven't even touched yet, but the bottom line (for me) is: maxquerylen and maxqueryid should always be handled with greate mistrust.
Regards
Jonathan Lewis
From: Noveljic Nenad <nenad.noveljic_at_vontobel.com> Sent: 04 February 2020 13:33
To: Jonathan Lewis; ORACLE-L (oracle-l_at_freelists.org) Subject: RE: select from ts$ in v$undostat.maxqueryid
> , except the last time when it doesn't CLOSE#
That rang the bell. It must be the open cursor that causes that entry in v$undostat. On the other hand, my monitoring script closes the session after executing the check, which implicitly closes the cursor.
But there's also an OEM agent session periodically executing the same query, where, alas, the cursor doesn't get closed, because the session remains open.
select user_name,sql_text from v$open_cursor where sql_id = '89w8y2pgn25yd' ;
USER_NAMESQL_TEXT
DBSNMPselect ts# from ts$ where ts$.online$ != 3 and bitand(flags,
I still have to find out the reason why the OEM executes this query as I disabled all the checks with a template.
Thanks,
Nenad
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.
-- http://www.freelists.org/webpage/oracle-lReceived on Tue Feb 04 2020 - 17:10:56 CET