Re: duplicate key value violates unique constraint and duplicated records

On 06/30/2017 09:42 PM, Steven Chang wrote:
> Uh...we also met duplicate rows with primary key column through
> restoring database by pg_basebackup.
> HAAAA.........................
> I don't think its an issue with primary key index corruption.

That is interesting, more information would be helpful though:

Postgres version?

OS and version?

The pg_basebackup command line invocation?

Why you don't think it is index corruption?

>
>
>
> 2017-07-01 7:30 GMT+08:00 Adrian Klaver <adrian(dot)klaver(at)aklaver(dot)com
> <mailto:adrian(dot)klaver(at)aklaver(dot)com>>:
>
> On 06/30/2017 07:33 AM, Timokhin Maxim wrote:
>
> Sure, here it is.
>
> pg_basebackup -h servername -R -P -D /data/upgrade/94 -U pgsql
> -v —xlog-method=stream —checkpoint=fast
>
> /usr/pgsql-9.5/bin/initdb -D /data/upgrade/95/ —encoding=utf8
> —locale=ru_RU.utf8 —lc-collate=ru_RU.utf8 —lc-ctype=ru_RU.utf8
> —lc-messages=en_US.utf8
>
> Then updating:
> /usr/pgsql-9.5/bin/pg_upgrade -b /usr/pgsql-9.4/bin/ -d
> /data/upgrade/94 -B /usr/pgsql-9.5/bin/ -D /data/upgrade/95 -k
>
> and so on to 9.6
>
>
> The original 9.4 database has the same encoding setup?
>
> FYI, you can use pg_upgrade to go straight from 9.4 to 9.6.
>
> https://www.postgresql.org/docs/9.6/static/pgupgrade.html
> <https://www.postgresql.org/docs/9.6/static/pgupgrade.html>
>
> "pg_upgrade supports upgrades from 8.4.X and later to the current
> major release of PostgreSQL, including snapshot and alpha releases."
>
>
>
> after that server starts normally.
>
>
> --
> Timokhin 'maf' Maxim
>
>
>
>
>
> --
> Adrian Klaver
> adrian(dot)klaver(at)aklaver(dot)com <mailto:adrian(dot)klaver(at)aklaver(dot)com>
>
>

--
Adrian Klaver
adrian(dot)klaver(at)aklaver(dot)com