Re: Drop user cascade

From: pgsql-general-owner(at)postgresql(dot)org [mailto:pgsql-general-owner(at)postgresql(dot)org] On Behalf Of Melvin Davidson
Sent: Wednesday, October 19, 2016 5:35 PM
To: Alex Ignatov (postgrespro) <a(dot)ignatov(at)postgrespro(dot)ru>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>; pgsql-general(at)postgresql(dot)org
Subject: Re: [GENERAL] Drop user cascade

On Wed, Oct 19, 2016 at 10:03 AM, Alex Ignatov (postgrespro) <a(dot)ignatov(at)postgrespro(dot)ru <mailto:a(dot)ignatov(at)postgrespro(dot)ru> > wrote:

-----Original Message-----
From: pgsql-general-owner(at)postgresql(dot)org <mailto:pgsql-general-owner(at)postgresql(dot)org>
[mailto:pgsql-general-owner(at)postgresql(dot)org <mailto:pgsql-general-owner(at)postgresql(dot)org> ] On Behalf Of Tom Lane
Sent: Wednesday, October 19, 2016 4:31 PM
To: Alex Ignatov (postgrespro) <a(dot)ignatov(at)postgrespro(dot)ru>
Cc: pgsql-general(at)postgresql(dot)org <mailto:pgsql-general(at)postgresql(dot)org>
Subject: Re: [GENERAL] Drop user cascade

"Alex Ignatov \(postgrespro\)" <a(dot)ignatov(at)postgrespro(dot)ru <mailto:a(dot)ignatov(at)postgrespro(dot)ru> > writes:
> Why do Postgres have no such functionality as DROP USER CASCADE? Is
> there any reasons in that absence?

The short answer is that DROP USER couldn't reach across databases to get
rid of owned objects in other databases. See

https://www.postgresql.org/docs/9.6/static/role-removal.html

regards, tom lane

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Some security consideration bear in mind that DROP OWNED cant delete own
objects in other DBs? In general what stops us to do inter DBs connection
like MSSQL?

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Alex Ignatov
Postgres Professional: http://www.postgrespro.com The Russian Postgres
Company

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>In general what stops us to do inter DBs connection like MSSQL?

It currently is not generic to PostgreSQL, but you can do that with the dblink extension/functions.

--

Melvin Davidson
I reserve the right to fantasize. Whether or not you
wish to share my fantasy is entirely up to you. <http://us.i1.yimg.com/us.yimg.com/i/mesg/tsmileys2/01.gif>

I know about dblink =)

The question was – is there any caveats to not allow xross db access. Maybe some security considerations prevent to implement it.

We all know that PG = one process rules multiple DBs why not to allow direct access to another DB. We have one transaction counter and so on where is the problems if any?

--

Alex Ignatov
Postgres Professional: <http://www.postgrespro.com> http://www.postgrespro.com
The Russian Postgres Company