Re: cannot drop an extension

----- Original Message -----
> From: Glyn Astill <glynastill(at)yahoo(dot)co(dot)uk>
> To: John Scalia <jayknowsunix(at)gmail(dot)com>; "pgsql-admin(at)postgresql(dot)org" <pgsql-admin(at)postgresql(dot)org>
> Cc:
> Sent: Tuesday, 20 January 2015, 18:42
> Subject: Re: [ADMIN] cannot drop an extension
>
>
>
>
>
> ----- Original Message -----
>> From: John Scalia <jayknowsunix(at)gmail(dot)com>
>> To: "pgsql-admin(at)postgresql(dot)org"
> <pgsql-admin(at)postgresql(dot)org>
>> Cc:
>> Sent: Tuesday, 20 January 2015, 18:12
>> Subject: [ADMIN] cannot drop an extension
>>
>> Hi all,
>>
>> My pg_upgrade woes continue... The primary server, V9.3.3, was originally
> used
>> as a testbed for pgpool-II, although we ended up chosing pacemaker and
> corosync
>> instead. When pgpool
>> was installed, the instructions have you add a pgpool-regclass extension.
>> Naturally, trying to upgrade to V9.4.0 fails and pg_upgrade writes a
>> loadable_libraries.txt saying that
>> $libdir/pgpool-regclass cannot be found. So, I restarted the original
> database,
>> and connected to both my csg_db instance and to the template1 instance,
> then
>> tried issuing a "drop
>> extension pgpool-reglass", but the both the db's say it does not
> exist.
>> I also tried dropping it by enclosing the extension name in quotes, both
> single
>> and double with no joy.
>> Then, I tried looking in pg_extensions, but I didn't see any similar
> entry
>> there either. How can I get rid of this extension so that pg_upgrade will
>> complete successfully? I've
>> asked on the pgpool admin list, but as it's the middle of the night in
>> Japan, I'm not expecting an immediate answer, if any.
>
>
> Sounds like you need to remove the pgpool-regclass entry from the
> shared_preload_libraries entry in your postgresql.conf
>

Actually after looking at the pgpool website, it looks like this isn't a shared preload library, but just a function.

Is it possible you installed the extension via the sql script rather than using create extension? IF so you just need to drop the relevent objects; take a look in the contrib directory.