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From pgsql-patches-owner+M12042=pgman=candle.pha.pa.us@postgresql.org Wed Jul 21 10:23:52 2004
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Date: Wed, 21 Jul 2004 10:22:25 -0400 (EDT)
From: "David F. Skoll" <dfs@roaringpenguin.com>
To: Bruce Momjian <pgman@candle.pha.pa.us>
cc: Tom Lane <tgl@sss.pgh.pa.us>,
Christopher Kings-Lynne <chriskl@familyhealth.com.au>,
pgsql-patches@postgresql.org
Subject: Re: [PATCHES] Patch for pg_dump: Multiple -t options and new -T
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On Wed, 21 Jul 2004, Bruce Momjian wrote:
> Even though I suggested it, I am afraid this is just too confusing an API.
How about this:
pg_dump -t t1 -- Dump table t1 in any schema
pg_dump -n s1 -- Dump all of schema s1
pg_dump -t t1 -n s1 -- Dump t1 in s1
pg_dump -t t1 -t t2 -n s1 -- Dump s1.t1 and s1.t2
pg_dump -t t1 -t t2 -n s1 -n s2 -- Dump s1.t1, s1.t2, s2.t1 and s2.t2
Basically, no "-t" option means dump all tables. No "-n" option
means dump all schemas. If any "-t" or "-n" options are present,
then we only dump the specified tables/schemas. We also probably
should not warn about missing tables, because it's likely that the
full cartesian product of schemas and tables won't exist.
And we nuke the -T and -N options.
Regards,
David.
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From pgsql-patches-owner+M12046=pgman=candle.pha.pa.us@postgresql.org Wed Jul 21 11:01:02 2004
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From: "David F. Skoll" <dfs@roaringpenguin.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
cc: Bruce Momjian <pgman@candle.pha.pa.us>,
Christopher Kings-Lynne <chriskl@familyhealth.com.au>,
pgsql-patches@postgresql.org
Subject: Re: [PATCHES] Patch for pg_dump: Multiple -t options and new -T
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On Wed, 21 Jul 2004, Tom Lane wrote:
> pg_dump -t s1.t1 -t s2.t2 -- Dump s1.t1 and s2.t2
That's a good idea, but then it's questionable whether we need the -n
switch at all. It might be simpler to extend the -t switch to
accept:
pg-dump -t 's1.*'
rather than using a -n switch. Of course, that breaks
backward-compatibility.
Regards,
David.
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From dfs@roaringpenguin.com Wed Jul 21 10:59:47 2004
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Date: Wed, 21 Jul 2004 10:59:28 -0400 (EDT)
From: "David F. Skoll" <dfs@roaringpenguin.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
cc: Bruce Momjian <pgman@candle.pha.pa.us>,
Christopher Kings-Lynne <chriskl@familyhealth.com.au>,
pgsql-patches@postgresql.org
Subject: Re: [PATCHES] Patch for pg_dump: Multiple -t options and new -T
option
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On Wed, 21 Jul 2004, Tom Lane wrote:
> pg_dump -t s1.t1 -t s2.t2 -- Dump s1.t1 and s2.t2
That's a good idea, but then it's questionable whether we need the -n
switch at all. It might be simpler to extend the -t switch to
accept:
pg-dump -t 's1.*'
rather than using a -n switch. Of course, that breaks
backward-compatibility.
Regards,
David.
From pgsql-patches-owner+M12047=pgman=candle.pha.pa.us@postgresql.org Wed Jul 21 11:11:15 2004
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To: "David F. Skoll" <dfs@roaringpenguin.com>
cc: Bruce Momjian <pgman@candle.pha.pa.us>,
Christopher Kings-Lynne <chriskl@familyhealth.com.au>,
pgsql-patches@postgresql.org
Subject: Re: [PATCHES] Patch for pg_dump: Multiple -t options and new -T option
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Comments: In-reply-to "David F. Skoll" <dfs@roaringpenguin.com>
message dated "Wed, 21 Jul 2004 10:59:28 -0400"
Date: Wed, 21 Jul 2004 11:09:17 -0400
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From: Tom Lane <tgl@sss.pgh.pa.us>
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"David F. Skoll" <dfs@roaringpenguin.com> writes:
> On Wed, 21 Jul 2004, Tom Lane wrote:
>> pg_dump -t s1.t1 -t s2.t2 -- Dump s1.t1 and s2.t2
> That's a good idea, but then it's questionable whether we need the -n
> switch at all.
Sure we do --- for backwards compatibility if nothing else.
> It might be simpler to extend the -t switch to accept:
> pg-dump -t 's1.*'
That would not be the same thing --- that would mean to dump *only tables*
from s1, rather than objects of all types. Anyway, I think it's a bit
late in this cycle to be proposing to implement wild-card matching.
Maybe for next time someone can do that, but for 7.5 I think we should
limit ourselves to cleaning up any design flaws of the already-submitted
patch.
regards, tom lane
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From glenebob@nwlink.com Tue Aug 17 21:15:39 2004
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From: "Glen Parker" <glenebob@nwlink.com>
To: "Bruce Momjian" <pgman@candle.pha.pa.us>
Subject: RE: [GENERAL] pg_dump feature request: Exclude tables?
Date: Tue, 17 Aug 2004 18:16:27 -0700
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> No, we have:
>
> * Allow pg_dump to use multiple -t and -n switches
>
> This should be done by allowing a '-t schema.table' syntax.
>
> but that doesn't have the exclude option. We had a patch that
> implemented an exclude but got confused over how it would interact with
> the schema switch and stuff. However, with the new '-t schema.table'
> syntax we might be able to get it working.
Hmm, while you're at it, maybe you could make it accept wild cards or regexp
or something :-) That should allow you to toss the -n parameter altogether
(schema.*) if you wanted to.
It would also be at least as good, IMO, to accept only one -t option,
re-defined as a comma-seperated list of names... And an exlusion parameter
defined the same way.
Glen Parker
glenebob@nwlink.com
From pgsql-general-owner+M64307=pgman=candle.pha.pa.us@postgresql.org Tue Aug 17 21:20:57 2004
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Subject: Re: [GENERAL] pg_dump feature request: Exclude tables?
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I second this. I would prefer an option to dump only the schema of
certain tables rather than excluding them altogether.
Paul
Glen Parker wrote:
>Since pg_dump will be allowing multiple -t <table> parameters for 8.0, here
>is a related feature request.
>
>A similar option (allowing multiples also) to EXCLUDE tables, so we can do a
>dump of the entire database minus a few tables.
>
>Glen Parker
>glenebob@nwlink.com
>
>
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From: Chris Travers <chris@travelamericas.com>
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To: Glen Parker <glenebob@nwlink.com>
cc: Postgres General <pgsql-general@postgresql.org>
Subject: Re: [GENERAL] pg_dump feature request: Exclude tables?
References: <AJEKKAIECKNMBCEKADJPKENHCMAA.glenebob@nwlink.com>
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Glen Parker wrote:
>>No, we have:
>>
>> * Allow pg_dump to use multiple -t and -n switches
>>
>> This should be done by allowing a '-t schema.table' syntax.
>>
>>but that doesn't have the exclude option. We had a patch that
>>implemented an exclude but got confused over how it would interact with
>>the schema switch and stuff. However, with the new '-t schema.table'
>>syntax we might be able to get it working.
>>
>>
>
>Hmm, while you're at it, maybe you could make it accept wild
>cards or regexp or something :-) That should allow you to toss
>the -n parameter altogether (schema.*) if you wanted to.
>
>It would also be at least as good, IMO, to accept only one -t
>option, re-defined as a comma-seperated list of names... And an
>exlusion parameter defined the same way.
>
>
>
How would this interact with the shell? It seems like a supportability
issue if we have to require single quotes around such arguments.
Best Wishes,
Chris Travers
Metatron Technology Consulting
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From: "Glen Parker" <glenebob@nwlink.com>
To: "Postgres General" <pgsql-general@postgresql.org>
Subject: Re: [GENERAL] pg_dump feature request: Exclude tables?
Date: Wed, 18 Aug 2004 12:11:03 -0700
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> >Hmm, while you're at it, maybe you could make it accept wild
> >cards or regexp or something :-) That should allow you to toss
> >the -n parameter altogether (schema.*) if you wanted to.
> >
> >It would also be at least as good, IMO, to accept only one -t
> >option, re-defined as a comma-seperated list of names... And an
> >exlusion parameter defined the same way.
> >
> How would this interact with the shell? It seems like a supportability
> issue if we have to require single quotes around such arguments.
I think wild cards would be extremely useful, but you're right, it can't be
required for common cases. Maybe "-t schema." could be shorthand for "-t
schema.*".
As far as the comma-seperated-list notion, I could take it or leave it. But
it absolutely does not require quoting unless you add superfluous
whitespace. That's just common, basic shell usage.
Glen Parker
glenebob@nwlink.com
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Subject: Re: [GENERAL] pg_dump feature request: Exclude tables?
From: Oliver Elphick <olly@lfix.co.uk>
Reply-To: olly@lfix.co.uk
To: Glen Parker <glenebob@nwlink.com>
cc: Postgres General <pgsql-general@postgresql.org>
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On Wed, 2004-08-18 at 20:11, Glen Parker wrote:
> > >Hmm, while you're at it, maybe you could make it accept wild
> > >cards or regexp or something :-) That should allow you to toss
> > >the -n parameter altogether (schema.*) if you wanted to.
> > >
> > >It would also be at least as good, IMO, to accept only one -t
> > >option, re-defined as a comma-seperated list of names... And an
> > >exlusion parameter defined the same way.
> > >
> > How would this interact with the shell? It seems like a supportability
> > issue if we have to require single quotes around such arguments.
>
> I think wild cards would be extremely useful, but you're right, it can't be
> required for common cases. Maybe "-t schema." could be shorthand for "-t
> schema.*".
Anyone who uses shell commands must already be familiar with the need to
quote wildcard characters which are not meant for the shell. One major
utility which requires this is find; others that spring to mind are dpkg
-l and mmv. Anyone who doesn't get it will very soon be educated; I
don't see this issue as a reason not to use such wildcards.
Oliver Elphick
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From tgl@sss.pgh.pa.us Sun Jan 16 23:24:17 2005
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To: Neil Conway <neilc@samurai.com>
cc: Bruce Momjian <pgman@candle.pha.pa.us>,
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Subject: Re: [HACKERS] pgdump
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References: <200501170442.j0H4gNW23506@candle.pha.pa.us> <1105937990.22946.17.camel@localhost.localdomain>
Comments: In-reply-to Neil Conway <neilc@samurai.com>
message dated "Mon, 17 Jan 2005 15:59:50 +1100"
Date: Mon, 17 Jan 2005 00:24:07 -0500
Message-ID: <23100.1105939447@sss.pgh.pa.us>
From: Tom Lane <tgl@sss.pgh.pa.us>
Status: OR
Neil Conway <neilc@samurai.com> writes:
> Something like the design elaborated here:
> http://archives.postgresql.org/pgsql-patches/2004-07/msg00374.php
> looks good to me, and would be preferrable to Andreas' patch IMHO.
> Unless I'm missing something, I don't see a patch from David Skoll in
> that thread that actually implements the above behavior. I'd be happy to
> implement Tom's suggested design for 8.1 unless someone has already
> beaten me to it.
A little further down-thread there was some discussion of also allowing
wild cards in the individual switches, eg
-t 's1.*'
(This would differ from '-n s1' in that a -t switch would restrict the
dump to tables only, whereas -n should take every sort of object in the
selected schema.) I dismissed it at the time because we were too close
to feature freeze, but the idea should be considered if you're going to
do a new patch for 8.1. I think the issues would be
* what are the wildcard rules exactly?
* what about quoting/downcasing rules?
Possibly it's sufficient to say "just like the way \d works in psql",
but we should look closely before leaping. We've been burnt before
by choosing rules that turned out to be awkward to use on a shell
command line because of interference from the shell's quoting and
expansion behavior.
regards, tom lane
From pgsql-hackers-owner+M63178=pgman=candle.pha.pa.us@postgresql.org Sun Jan 16 23:47:33 2005
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Subject: Re: [HACKERS] pgdump
From: Neil Conway <neilc@samurai.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
cc: Bruce Momjian <pgman@candle.pha.pa.us>,
Andreas Joseph Krogh <andreak@officenet.no>, Enrico <scotty@linuxtime.it>,
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In-Reply-To: <23100.1105939447@sss.pgh.pa.us>
References: <200501170442.j0H4gNW23506@candle.pha.pa.us>
<1105937990.22946.17.camel@localhost.localdomain>
<23100.1105939447@sss.pgh.pa.us>
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Date: Mon, 17 Jan 2005 16:43:18 +1100
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On Mon, 2005-01-17 at 00:24 -0500, Tom Lane wrote:
> A little further down-thread there was some discussion of also allowing
> wild cards in the individual switches, eg
>
> -t 's1.*'
>
> (This would differ from '-n s1' in that a -t switch would restrict the
> dump to tables only, whereas -n should take every sort of object in the
> selected schema.)
Is this actually useful behavior? My gut feeling is "no", but I'm open
to debate. ISTM that the combination of "-n" and "-t" achieves a pretty
wide swath of the desired functionality. Considering that the various
combinations of these switches is already quite complex, I think it
would be wise to avoid additional, unnecessary complications. Plus it
avoids the need to play games with escaping the wildcard from the shell.
> * what about quoting/downcasing rules?
If we don't implement wildcards, I don't believe we will need to change
the present behavior of the "-n" and "-t" switches WRT case conversion
etc.
-Neil
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To: Neil Conway <neilc@samurai.com>
cc: Bruce Momjian <pgman@candle.pha.pa.us>,
Andreas Joseph Krogh <andreak@officenet.no>, Enrico <scotty@linuxtime.it>,
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Subject: Re: [HACKERS] pgdump
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Comments: In-reply-to Neil Conway <neilc@samurai.com>
message dated "Mon, 17 Jan 2005 16:43:18 +1100"
Date: Mon, 17 Jan 2005 00:54:22 -0500
Message-ID: <23360.1105941262@sss.pgh.pa.us>
From: Tom Lane <tgl@sss.pgh.pa.us>
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Neil Conway <neilc@samurai.com> writes:
> On Mon, 2005-01-17 at 00:24 -0500, Tom Lane wrote:
>> A little further down-thread there was some discussion of also allowing
>> wild cards in the individual switches,
> Is this actually useful behavior?
Possibly not. It's been requested often enough, but multiple -t and -n
switches might be sufficient.
>> * what about quoting/downcasing rules?
> If we don't implement wildcards, I don't believe we will need to change
> the present behavior of the "-n" and "-t" switches WRT case conversion
> etc.
I'm not sure you can ignore the issue completely. The proposal you're
supporting included being able to pick out a specific table with
-t s1.t1
and without any quoting rules it would then become impossible to deal
with names containing dots. Are we willing to blow off that case?
Or is it better to drop that part of the proposal?
regards, tom lane
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From neilc@samurai.com Mon Jan 17 00:11:03 2005
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Subject: Re: [HACKERS] pgdump
From: Neil Conway <neilc@samurai.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
cc: Bruce Momjian <pgman@candle.pha.pa.us>,
Andreas Joseph Krogh <andreak@officenet.no>, Enrico <scotty@linuxtime.it>,
pgsql-hackers <pgsql-hackers@postgresql.org>
In-Reply-To: <23360.1105941262@sss.pgh.pa.us>
References: <200501170442.j0H4gNW23506@candle.pha.pa.us>
<1105937990.22946.17.camel@localhost.localdomain>
<23100.1105939447@sss.pgh.pa.us>
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Content-Type: text/plain
Date: Mon, 17 Jan 2005 17:09:10 +1100
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Status: OR
On Mon, 2005-01-17 at 00:54 -0500, Tom Lane wrote:
> -t s1.t1
> [...] without any quoting rules it would then become impossible to
> deal with names containing dots.
Ah, yeah -- sorry, I was focusing on case conversion rather than quoting
in general.
> Are we willing to blow off that case?
> Or is it better to drop that part of the proposal?
I would be OK with just ignoring this case, but on reflection I would
prefer removing the "-t schema.table" syntax. Removing the feature
resolves the quoting issue and also simplifies pg_dump's behavior. We
lose the ability to dump table t1 in schema s1 and table t2 in schema s2
in a single command, but
(a) you can specify "-t t1 -t t2 -n s1 -n s2", although this might also
dump t1.s2 and/or t2.s1
(b) you can just run pg_dump twice, specifying the appropriate -t and -n
options each time
So the behavior would be that suggested earlier by David Skoll:
> pg_dump -t t1 -- Dump table t1 in any schema
> pg_dump -n s1 -- Dump all of schema s1
> pg_dump -t t1 -n s1 -- Dump t1 in s1
> pg_dump -t t1 -t t2 -n s1 -- Dump s1.t1 and s1.t2
> pg_dump -t t1 -t t2 -n s1 -n s2 -- Dump s1.t1, s1.t2, s2.t1 and s2.t2
We'd only raise an error if we found no matching tables/schemas, as was
hashed out in July.
-Neil
From tgl@sss.pgh.pa.us Mon Jan 17 00:19:43 2005
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Mon, 17 Jan 2005 01:19:36 -0500 (EST)
To: Neil Conway <neilc@samurai.com>
cc: Bruce Momjian <pgman@candle.pha.pa.us>,
Andreas Joseph Krogh <andreak@officenet.no>, Enrico <scotty@linuxtime.it>,
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Subject: Re: [HACKERS] pgdump
In-Reply-To: <1105942150.22946.46.camel@localhost.localdomain>
References: <200501170442.j0H4gNW23506@candle.pha.pa.us> <1105937990.22946.17.camel@localhost.localdomain> <23100.1105939447@sss.pgh.pa.us> <1105940598.22946.32.camel@localhost.localdomain> <23360.1105941262@sss.pgh.pa.us> <1105942150.22946.46.camel@localhost.localdomain>
Comments: In-reply-to Neil Conway <neilc@samurai.com>
message dated "Mon, 17 Jan 2005 17:09:10 +1100"
Date: Mon, 17 Jan 2005 01:19:36 -0500
Message-ID: <23582.1105942776@sss.pgh.pa.us>
From: Tom Lane <tgl@sss.pgh.pa.us>
Status: OR
Neil Conway <neilc@samurai.com> writes:
> So the behavior would be that suggested earlier by David Skoll:
>> pg_dump -t t1 -- Dump table t1 in any schema
>> pg_dump -n s1 -- Dump all of schema s1
>> pg_dump -t t1 -n s1 -- Dump t1 in s1
>> pg_dump -t t1 -t t2 -n s1 -- Dump s1.t1 and s1.t2
>> pg_dump -t t1 -t t2 -n s1 -n s2 -- Dump s1.t1, s1.t2, s2.t1 and s2.t2
Well, that at least obeys the KISS principle ;-). Sure, let's try that
and see if it satisfies people.
Just to be clear: what I understand the logic to be is "OR" across
multiple switches of the same type, but "AND" across switches of
two types.
regards, tom lane
From pgsql-hackers-owner+M63184=pgman=candle.pha.pa.us@postgresql.org Mon Jan 17 00:50:05 2005
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Subject: Re: [HACKERS] pgdump
From: Neil Conway <neilc@samurai.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
cc: Bruce Momjian <pgman@candle.pha.pa.us>,
Andreas Joseph Krogh <andreak@officenet.no>, Enrico <scotty@linuxtime.it>,
pgsql-hackers <pgsql-hackers@postgresql.org>
In-Reply-To: <23582.1105942776@sss.pgh.pa.us>
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Content-Type: text/plain
Date: Mon, 17 Jan 2005 17:46:39 +1100
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Status: OR
On Mon, 2005-01-17 at 01:19 -0500, Tom Lane wrote:
> Just to be clear: what I understand the logic to be is "OR" across
> multiple switches of the same type, but "AND" across switches of
> two types.
If I understand you correctly, you're suggesting that we should only
report an error if none of the specified tables exist OR none of the
specified schemas exist. I'm not sure I agree. Consider this command:
pg_dump -t some_table -t non_existent_table
Assuming some_table exists, we will now blithely ignore the nonexistent
table. That is perfectly reasonable because of the cartesian explosion
of possibilities that occurs when both -t and -n are specified, but in
the absence of that it seems regrettable. The same applies to "-n foo -n
non_existent_schema", naturally.
An easy fix would be to raise an error for each specified but
nonexistent object, *except* if both "-n" and "-t" are specified, in
which case we use your behavior (report an error if none of the
specified tables are found OR none of the specified schemas are found).
Perhaps better would be to require that each "-t" or "-n" switch results
in a 'match' -- i.e. if you specify "-t foo -n x -n y", we check that
(a) schema x exists AND
(b) schema y exists AND
(c) table foo exists in (schema x OR schema y)
This means we have tighter error checking, although I'm not sure how
intuitive it is.
-Neil
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From pgsql-hackers-owner+M63185=pgman=candle.pha.pa.us@postgresql.org Mon Jan 17 01:42:12 2005
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To: Neil Conway <neilc@samurai.com>
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Subject: Re: [HACKERS] pgdump
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References: <200501170442.j0H4gNW23506@candle.pha.pa.us> <1105937990.22946.17.camel@localhost.localdomain> <23100.1105939447@sss.pgh.pa.us> <1105940598.22946.32.camel@localhost.localdomain> <23360.1105941262@sss.pgh.pa.us> <1105942150.22946.46.camel@localhost.localdomain> <23582.1105942776@sss.pgh.pa.us> <1105944399.22946.74.camel@localhost.localdomain>
Comments: In-reply-to Neil Conway <neilc@samurai.com>
message dated "Mon, 17 Jan 2005 17:46:39 +1100"
Date: Mon, 17 Jan 2005 02:40:19 -0500
Message-ID: <24033.1105947619@sss.pgh.pa.us>
From: Tom Lane <tgl@sss.pgh.pa.us>
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Neil Conway <neilc@samurai.com> writes:
> On Mon, 2005-01-17 at 01:19 -0500, Tom Lane wrote:
>> Just to be clear: what I understand the logic to be is "OR" across
>> multiple switches of the same type, but "AND" across switches of
>> two types.
> If I understand you correctly, you're suggesting that we should only
> report an error if none of the specified tables exist OR none of the
> specified schemas exist.
No, I was only expressing an opinion about what should be dumped,
not about what kind of diagnostic messages to issue.
If you want to warn about switches that fail to match anything,
go for it. (I vote for just a warning, though, not a hard error.)
regards, tom lane
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From pgsql-hackers-owner+M63190=pgman=candle.pha.pa.us@postgresql.org Mon Jan 17 06:43:18 2005
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Date: Mon, 17 Jan 2005 23:33:31 +1100
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To: Neil Conway <neilc@samurai.com>
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Andreas Joseph Krogh <andreak@officenet.no>, Enrico <scotty@linuxtime.it>,
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Subject: Re: [HACKERS] pgdump
References: <200501170442.j0H4gNW23506@candle.pha.pa.us> <1105937990.22946.17.camel@localhost.localdomain> <23100.1105939447@sss.pgh.pa.us> <1105940598.22946.32.camel@localhost.localdomain> <23360.1105941262@sss.pgh.pa.us> <1105942150.22946.46.camel@localhost.localdomain>
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Status: OR
Neil Conway wrote:
>I would be OK with just ignoring this case, but on reflection I would
>prefer removing the "-t schema.table" syntax. Removing the feature
>resolves the quoting issue and also simplifies pg_dump's behavior. We
>lose the ability to dump table t1 in schema s1 and table t2 in schema s2
>in a single command, but
>
>(a) you can specify "-t t1 -t t2 -n s1 -n s2", although this might also
>dump t1.s2 and/or t2.s1
>
>(b) you can just run pg_dump twice, specifying the appropriate -t and -n
>options each time
>
>So the behavior would be that suggested earlier by David Skoll:
>
>
>
>>pg_dump -t t1 -- Dump table t1 in any schema
>>pg_dump -n s1 -- Dump all of schema s1
>>pg_dump -t t1 -n s1 -- Dump t1 in s1
>>pg_dump -t t1 -t t2 -n s1 -- Dump s1.t1 and s1.t2
>>pg_dump -t t1 -t t2 -n s1 -n s2 -- Dump s1.t1, s1.t2, s2.t1 and s2.t2
>>
>>
>
>We'd only raise an error if we found no matching tables/schemas, as was
>hashed out in July.
>
>
I really prefer the -t "schema.table" syntax over the scenario listed
above. If you look at the syntax for psql "\" commands, and SQL
commands, the structure "tablename, optionally schema-qualified" is seen
time and time again. By allowing the same structure in arguments to
pg_dump, you're helping add to an overall feeling of consistency in the
postgres toolbox.
My feeling is that, to an occasional or novice user of pg_dump, the
proposed combination of -n and -t will seem daunting and idiosyncratic,
especially for complex cases.
The fact that with -n -t there are some cases that are actually
impossible to perform in a single dump is quite a powerful disadvantage
IMO. Yes, you *can* just run pg_dump multiple times, but I think anyone
using pg_dump would rather quote out a wilcard than issue virtually the
same command with one changed argument over and over again. Or writing
a script to loop through the desired schema/table combinations and
dumping each one at a time.
Is command line quoting really that much of a hassle? And if so, what
are the major hurdles?
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