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* How to delete column level Stats/Histogram
@ 2024-05-30 21:27 Wong, Kam Fook (TR Technology) <[email protected]>
2024-05-30 22:45 ` Re: How to delete column level Stats/Histogram David Rowley <[email protected]>
0 siblings, 1 reply; 3+ messages in thread
From: Wong, Kam Fook (TR Technology) @ 2024-05-30 21:27 UTC (permalink / raw)
To: pgsql-general
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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^ permalink raw reply [nested|flat] 3+ messages in thread
* Re: How to delete column level Stats/Histogram
2024-05-30 21:27 How to delete column level Stats/Histogram Wong, Kam Fook (TR Technology) <[email protected]>
@ 2024-05-30 22:45 ` David Rowley <[email protected]>
2024-05-31 01:55 ` Re: [EXT] Re: How to delete column level Stats/Histogram David Rowley <[email protected]>
0 siblings, 1 reply; 3+ messages in thread
From: David Rowley @ 2024-05-30 22:45 UTC (permalink / raw)
To: Wong, Kam Fook (TR Technology) <[email protected]>; +Cc: pgsql-general
On Fri, 31 May 2024 at 09:28, Wong, Kam Fook (TR Technology)
<[email protected]> 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
^ permalink raw reply [nested|flat] 3+ messages in thread
* Re: [EXT] Re: How to delete column level Stats/Histogram
2024-05-30 21:27 How to delete column level Stats/Histogram Wong, Kam Fook (TR Technology) <[email protected]>
2024-05-30 22:45 ` Re: How to delete column level Stats/Histogram David Rowley <[email protected]>
@ 2024-05-31 01:55 ` David Rowley <[email protected]>
0 siblings, 0 replies; 3+ messages in thread
From: David Rowley @ 2024-05-31 01:55 UTC (permalink / raw)
To: Wong, Kam Fook (TR Technology) <[email protected]>; pgsql-general
(please keep communication on the list)
On Fri, 31 May 2024 at 13:43, Wong, Kam Fook (TR Technology)
<[email protected]> wrote:
>
> Silly question why did I run into this problem below? Will the autovacuum analyze abc reset it back which I don't want it 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
^ permalink raw reply [nested|flat] 3+ messages in thread
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2024-05-30 21:27 How to delete column level Stats/Histogram Wong, Kam Fook (TR Technology) <[email protected]>
2024-05-30 22:45 ` David Rowley <[email protected]>
2024-05-31 01:55 ` David Rowley <[email protected]>
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