Re: cannot drop an extension

----- Original Message -----
> From: Glyn Astill <glynastill@yahoo.co.uk>
> To: John Scalia <jayknowsunix@gmail.com>; "pgsql-admin@postgresql.org" <pgsql-admin@postgresql.org>
> Cc:
> Sent: Tuesday, 20 January 2015, 18:42
> Subject: Re: [ADMIN] cannot drop an extension
>
>
>
>
>
> ----- Original Message -----
>>  From: John Scalia <jayknowsunix@gmail.com>
>>  To: "pgsql-admin@postgresql.org"
> <pgsql-admin@postgresql.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
todrop the relevent objects; take a look in the contrib directory.