outside possibility: Check that you don’t have anything creating and dropping
objects in such large quantities that it quickly makes the stats stale?
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On ;
Behalf Of Ls Cheng
Sent: Wednesday, July 14, 2021 11:50 AM
To: Beckstrom, Jeffrey
Cc: Fairlie Rego; Powell, Mark; Oracle Mailinglist
Subject: Re: DBMS_STATS.GATHER_DICTIONARY_STATS not gathering stale statistics
I cannot run that, it takes 37 hours.
I tried this, looks better
SQL> exec dbms_stats.gather_schema_stats('SYS')
PL/SQL procedure successfully completed.
SQL> select to_char(last_analyzed, 'yyyymmdd') , count(*) from
dba_tab_statistics where stale_stats = 'YES' and owner = 'SYS' group by
to_char(last_analyzed, 'yyyymmdd')
order by 1;
TO_CHAR( COUNT(*)
-------- ----------
20210714 11
so it seems to me the bug still exists despite having applied the patch
On Wed, Jul 14, 2021 at 5:01 PM Beckstrom, Jeffrey <jbeckstrom@xxxxxxxxx> wrote:
What happens if you run: dbms_stats.gather_fixed_objects_stats;
From: oracle-l-bounce@xxxxxxxxxxxxx <oracle-l-bounce@xxxxxxxxxxxxx> On Behalf
Of Ls Cheng
Sent: Wednesday, July 14, 2021 10:55 AM
To: Fairlie Rego <fairlie.rego@xxxxxxxxx>
Cc: Powell, Mark <mark.powell2@xxxxxxx>; Oracle Mailinglist
<oracle-l@xxxxxxxxxxxxx>
Subject: Re: DBMS_STATS.GATHER_DICTIONARY_STATS not gathering stale statistics
Hi
Patch applied but still got strange results
SQL> exec dbms_stats.gather_dictionary_stats(degree => 8);
PL/SQL procedure successfully completed.
Elapsed: 00:37:07.89
select to_char(last_analyzed, 'yyyymmdd') , count(*) from dba_tab_statistics
where stale_stats = 'YES' and owner = 'SYS' group by to_char(last_analyzed,
'yyyymmdd')
order by 1;
TO_CHAR( COUNT(*)
-------- ----------
20210713 1
20210714 346
I should get very few o 0 tables with stale statistics under sys IMHO.
Thanks
On Wed, Jul 14, 2021 at 1:41 AM Ls Cheng <exriscer@xxxxxxxxx> wrote:
Hi
I am not 100% sure if the symptoms match because the last_analyzed for those
stale stats tables are from a few days ago to a few months ago. However I am
planning to apply the patch for bug 31464691 due to other issues (mentioned in
2448781.1) tomorrow, I will see if it fixes this issue and let you know.
Thanks
On Tue, Jul 13, 2021 at 11:18 PM Fairlie Rego <fairlie.rego@xxxxxxxxx> wrote:
Isn't this the bug documented below
Statistics for All Tables Getting Stale With No Data Change in 12.2 (Doc ID
2448781.1)
* Data has not changed but many objects have stale statistics
Ta
Fairlie
On Wed, Jul 14, 2021 at 4:08 AM Ls Cheng <exriscer@xxxxxxxxx> wrote:
Hi
I think so
SQL> SELECT DBMS_STATS.get_prefs('PUBLISH') DBMS_STATS_PREFS from dual;
DBMS_STATS_PREFS
------------------------------
TRUE
Thanks
On Tue, Jul 13, 2021 at 5:49 PM Powell, Mark <mark.powell2@xxxxxxx> wrote:
Are your statistics set to publish?
Mark Powell
Database Administration
(313) 592-5148
_____
From: oracle-l-bounce@xxxxxxxxxxxxx <oracle-l-bounce@xxxxxxxxxxxxx> on behalf
of Ls Cheng <exriscer@xxxxxxxxx>
Sent: Tuesday, July 13, 2021 8:37 AM
To: Oracle Mailinglist <oracle-l@xxxxxxxxxxxxx>
Subject: DBMS_STATS.GATHER_DICTIONARY_STATS not gathering stale statistics
Hi all
I am running 19.10 8 nodes RAC database with Multitenant. I noticed that after
running DBMS_STATS.GATHER_DICTIONARY_STATS in the PDB I still see tables with
stale statistics under SYS. For example:
exec DBMS_STATS.GATHER_DICTIONARY_STATS
SQL> select count(*)
2 from dba_tab_statistics
3 where STALE_STATS = 'YES'
4 and owner = 'SYS';
COUNT(*)
----------
305
Anyone seen this behaviour?
TIA
--
Fairlie Rego
Executive Database Architect
www.technoconsulting.com.au
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