RE: Question on upgrading postgresql from 10.7 to 11.5

Thanks!

I was misled by "pg_controldata" keyword and totally ignored the WAL segment size variable.

Much appreciated for your help.

-----Original Message-----
From: Julien Rouhaud [mailto:rjuju123(at)gmail(dot)com]
Sent: Wednesday, December 25, 2019 10:36 AM
To: Lu, Dan <Dan(dot)Lu(at)sig(dot)com>
Cc: pgsql-general(at)postgresql(dot)org
Subject: Re: Question on upgrading postgresql from 10.7 to 11.5

On Wed, Dec 25, 2019 at 3:42 PM Lu, Dan <Dan(dot)Lu(at)sig(dot)com> wrote:
>
> Hello,
>
> I am trying to upgrade my PG instance from 10.7 to 11.5.
>
> I got an error in doing so. Any idea what I am missing?
>
> Example: pg_upgrade -d /hostname/pg/dpoc/data -D
> /hostname/pg/dpoc115/data -b /hostname/pg/PostgreSQL-10.7/bin -B
> /hostname/pg/PostgreSQL-11.5/bin -p 5432 -P 9432 -c -v
>
> Error message:
>
> old and new pg_controldata WAL segment sizes are invalid or do not
> match

The message is pretty much self explanatory. It looks like you used "initdb --wal-segsize" for the 11.5 cluster using a value different from the one that were used in your 10.7 cluster (probably 16MB). You can check the value for each using "SHOW wal_segment_size". You have to recreate a new pg11 data directory using the same value as the 10.7 one. While at it, you should update the pg11 binary to the latest minor version, 11.6.

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