RE: purge of AWR historical tables
Date: Fri, 23 Apr 2021 11:23:10 +0000
Message-ID: <a2d9d0ad7e0848d29a941a59a3483792_at_vontobel.com>
I remembered a similar problem on a 12.1 database from long time ago.
sys.wri$_optstat_tab_history was growing.
I figured out the statistics purging job was executing the following delete:
DELETE /*+ dynamic_sampling(4) */
I assume that :1 was systimestamp-retention.
The key point was that the statistics from the 19th century weren’t considered for deleting.
Statistics for two tables were from long ago:
select table_name,last_analyzed from dba_tables where table_name in
To rule this out, check for strange last_analyzed entries.
I don’t know the origin of these entries. There were already there when I started the job. I couldn’t find v$database.created in my notes, but people who have been here longer swear that the database was created in this century.
I reset the last_analyzed by setting manually setting statistics, which fixed the problem:
exec dbms_stats.set_table_stats( OWNNAME=>'K',TABNAME=>'TAB1',NUMROWS=>10000);
exec dbms_stats.set_table_stats( OWNNAME=>'K',TABNAME=>'TAB2',NUMROWS=>10000);
Best regards,
Nenad
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>.
FROM sys.wri$_optstat_tab_history
WHERE savtime < :1
AND savtime > TIMESTAMP '1900-01-01 00:00:00 -0:0'
AND ROWNUM <= NVL ( :2, ROWNUM);
(select object_name from dba_objects where object_id in
( select obj# from sys.tab$ where analyzetime in (select max(analyzetime) from sys.tab$ where analyzetime is not null ) ));
TABLE_NAME LAST_ANALYZED
TAB1 01.01.0001
TAB2 01.01.0001
These weren’t considered by the delete.
Please consider the environment before printing this e-mail.
Bitte denken Sie an die Umwelt, bevor Sie dieses E-Mail drucken.
--
http://www.freelists.org/webpage/oracle-l
Received on Fri Apr 23 2021 - 13:23:10 CEST