Re: purge of AWR historical tables

I've just commented on something similar on Dominic's blog note. It's possible that this has something to do with pending or priviate statistics.
The last time I looked (possibly in a recent version only) pending stats had a future date.
Maybe at some time in the past they were implemented with a date in the far past constructed from the SID and Serial# of the session creatring them - which would explain the SQL reported by Dominic in his blognote.

Regards
Jonathan Lewis

On Fri, 23 Apr 2021 at 12:23, Noveljic Nenad <nenad.noveljic_at_vontobel.com> wrote:

> I remembered a similar problem on a 12.1 database from long time ago.
>
>
>
> sys.wri$_optstat_tab_history was growing.
>
>
>
> I figured out the statistics purging job was executing the following
> delete:
>
>
>
> DELETE /*+ dynamic_sampling(4) */
>
> FROM sys.wri$_optstat_tab_history
>
> WHERE savtime < :1
>
> AND savtime > TIMESTAMP '1900-01-01 00:00:00 -0:0'
>
> AND ROWNUM <= NVL ( :2, ROWNUM);
>
>
>
> 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
>
> (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.
>
>
>
> 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
>
>
>
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