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* vacuumdb and a long list of tables
@ 2025-02-23 18:09 Ron Johnson <ronljohnsonjr@gmail.com>
0 siblings, 1 reply; 3+ messages in thread
From: Ron Johnson @ 2025-02-23 18:09 UTC (permalink / raw)
To: Pgsql-admin <pgsql-admin@lists.postgresql.org>
PG 14, if it matters.
Is there any specific order by which "vacuumdb -t t1 -t t2 -t t3 ..."
processes those tables?
I pass an alphabetical list of tables, but "vacuumdb --echo" doesn't
process them alphabetically. Nor does it process them in oid order or
seemingly by table size.
--
Death to <Redacted>, and butter sauce.
Don't boil me, I'm still alive.
<Redacted> lobster!
^ permalink raw reply [nested|flat] 3+ messages in thread
* Re: vacuumdb and a long list of tables
@ 2025-02-23 20:21 Tom Lane <tgl@sss.pgh.pa.us>
parent: Ron Johnson <ronljohnsonjr@gmail.com>
0 siblings, 1 reply; 3+ messages in thread
From: Tom Lane @ 2025-02-23 20:21 UTC (permalink / raw)
To: Ron Johnson <ronljohnsonjr@gmail.com>; +Cc: Pgsql-admin <pgsql-admin@lists.postgresql.org>
Ron Johnson <ronljohnsonjr@gmail.com> writes:
> Is there any specific order by which "vacuumdb -t t1 -t t2 -t t3 ..."
> processes those tables?
A quick look at the source code finds
appendPQExpBufferStr(&catalog_query, " ORDER BY c.relpages DESC;");
so apparently it's trying to process them in descending size order,
although this doesn't account for indexes or toast tables.
regards, tom lane
^ permalink raw reply [nested|flat] 3+ messages in thread
* Re: vacuumdb and a long list of tables
@ 2025-02-23 20:44 Ron Johnson <ronljohnsonjr@gmail.com>
parent: Tom Lane <tgl@sss.pgh.pa.us>
0 siblings, 0 replies; 3+ messages in thread
From: Ron Johnson @ 2025-02-23 20:44 UTC (permalink / raw)
To: Pgsql-admin <pgsql-admin@lists.postgresql.org>
On Sun, Feb 23, 2025 at 3:21 PM Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Ron Johnson <ronljohnsonjr@gmail.com> writes:
> > Is there any specific order by which "vacuumdb -t t1 -t t2 -t t3 ..."
> > processes those tables?
>
> A quick look at the source code finds
>
> appendPQExpBufferStr(&catalog_query, " ORDER BY c.relpages DESC;");
>
> so apparently it's trying to process them in descending size order,
> although this doesn't account for indexes or toast tables.
>
Toast tables... when I wrote my email, I was wondering about that. TOAST
is what comprises the "bigness" of the 800 lb gorillas, but combining table
plus toast would be pretty messy.
Thanks.
--
Death to <Redacted>, and butter sauce.
Don't boil me, I'm still alive.
<Redacted> lobster!
^ permalink raw reply [nested|flat] 3+ messages in thread
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2025-02-23 18:09 vacuumdb and a long list of tables Ron Johnson <ronljohnsonjr@gmail.com>
2025-02-23 20:21 ` Tom Lane <tgl@sss.pgh.pa.us>
2025-02-23 20:44 ` Ron Johnson <ronljohnsonjr@gmail.com>
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