From: | Nandakumar M <m(dot)nanda92(at)gmail(dot)com> |
---|---|
To: | Peter Geoghegan <pg(at)bowt(dot)ie> |
Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at>, "pgsql-general(at)lists(dot)postgresql(dot)org" <pgsql-general(at)lists(dot)postgresql(dot)org> |
Subject: | Re: Rows violating Foreign key constraint exists |
Date: | 2019-12-09 10:17:27 |
Message-ID: | CANcFUu60dD8NujoW7kcw3hx7MihuwgxQyEocQSWJ5mdXybHohw@mail.gmail.com |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-general |
Hi,
Sorry about the delay in getting back with the results.
>
> On Fri, Nov 29, 2019 at 7:23 AM Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> > The most likely "corruption" explanation is something wrong with the
> > indexes on the referenced and/or referencing column, causing rows to
> > not be found when referential actions should have found them. Random
> > querying of the tables wouldn't necessarily expose that --- you'd need
> > to be sure that your queries use the questionable indexes, and maybe
> > even search for some of the specific rows that seem mis-indexed.
This indeed is the problem. Select query with criteria on FK column
did not return any rows. However, after I disabled indexscan, bitmap
indexscan and tried the same query this time sequential scan was
performed by PG and it returned 80 rows.
> Or try using contrib/amcheck, which is available in Postgres 10.
> Perhaps try the query here, modified to verify all B-Tree indexes (not
> just those indexes in the pg_catalog schema):
>
> https://www.postgresql.org/docs/10/amcheck.html
>
> --
I tried amcheck query on all indexes in the database and it did not
raise any errors.
How do I identify such corruption exists in the database? Will
enabling page checksum be of help here?
Thanks.
Regards,
Nanda
From | Date | Subject | |
---|---|---|---|
Next Message | Dor Ben Dov | 2019-12-09 10:24:05 | PostgreSQL HA FO question |
Previous Message | Adrian Klaver | 2019-12-08 21:23:20 | Re: canno save editted data |