RE: DBMS_STATS.GATHER_DICTIONARY_STATS not gathering stale statistics

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_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] 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_at_gcrta.org> wrote:

What happens if you run: dbms_stats.gather_fixed_objects_stats;  

From: oracle-l-bounce_at_freelists.org <oracle-l-bounce_at_freelists.org> On Behalf Of Ls Cheng Sent: Wednesday, July 14, 2021 10:55 AM

To: Fairlie Rego <fairlie.rego_at_gmail.com>
Cc: Powell, Mark <mark.powell2_at_dxc.com>; Oracle Mailinglist <oracle-l_at_freelists.org>
Subject: Re: DBMS_STATS.GATHER_DICTIONARY_STATS not gathering stale statistics

 

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_at_gmail.com> 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_at_gmail.com> 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

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

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http://www.freelists.org/webpage/oracle-l Received on Wed Jul 14 2021 - 18:33:25 CEST