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Thread: How to delete column level Stats/Histogram

How to delete column level Stats/Histogram

From
"Wong, Kam Fook (TR Technology)"
Date:
  1. Is there a way to delete a specific column level stats/histogram.  The following approach does not work.

 

alter table abc alter column bg_org_partner set statistics 0;

analyze   abc;

 

select *

FROM pg_stats where tablename in ('abc' ) and attname = 'bg_org_partner';

 

the most_common_vals remain and most_common_freqs remain the same.

 

  1. Any other ways or workaround such as wiping out a specific table level stat, then restore the stats but minus 1 column.  And the future vacuum analyze/analyze will not be updating that specific column stat. 

 

Thank you

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Re: How to delete column level Stats/Histogram

From
David Rowley
Date:
On Fri, 31 May 2024 at 09:28, Wong, Kam Fook (TR Technology)
<kamfook.wong@thomsonreuters.com> wrote:
> Is there a way to delete a specific column level stats/histogram.  The following approach does not work.
>
> alter table abc alter column bg_org_partner set statistics 0;
> analyze   abc;

You'd have to:

DELETE FROM pg_statistic WHERE starelid = 'abc'::regclass and
staattnum = (SELECT attnum FROM pg_attribute WHERE attrelid =
'abc'::regclass AND attname = 'bg_org_partner');

to get rid of it.

David

Re: [EXT] Re: How to delete column level Stats/Histogram

From
David Rowley
Date:
(please keep communication on the list)

On Fri, 31 May 2024 at 13:43, Wong, Kam Fook (TR Technology)
<kamfook.wong@thomsonreuters.com> wrote:
>
> Silly question why did I run into this problem below?  Will the autovacuum analyze abc reset it back which I don't
wantit to.
 
>
> DELETE FROM pg_statistic WHERE starelid = 'abc'::regclass and staattnum = (SELECT attnum FROM pg_attribute WHERE
attrelid= 'abc'::regclass AND attname = 'bg_org_partner');
 
>
> SQL Error [42P01]: ERROR: relation "abc" does not exist
>   Position: 52

The schema for the abc table will need to be in your search_path.
You'll need to be connected to the correct database too.

David