Обсуждение: Re: [PATCHES] Tablespace patch review
[ switching to pghackers for wider comment ]
Christopher Kings-Lynne <chriskl@familyhealth.com.au> writes:
> By the way, I think that we should deny users the ability to create
> tablespaces that begin with pg_. Also, the existing ones should be
> pg_global and pg_default. That way, we have room to move if ever we
> decide we want more system tablespaces. It also makes it easier to dump
> non-system tablespaces.
Seems like a reasonable suggestion to me. Any objections?
BTW, another argument for this is that "default" is a reserved word.
I'd already noticed in testing that CREATE TABLE ... TABLESPACE default
doesn't work unless you double-quote "default". Calling it pg_default
would avoid that annoyance.
regards, tom lane
Tom Lane wrote: >[ switching to pghackers for wider comment ] > >Christopher Kings-Lynne <chriskl@familyhealth.com.au> writes: > > >>By the way, I think that we should deny users the ability to create >>tablespaces that begin with pg_. Also, the existing ones should be >>pg_global and pg_default. That way, we have room to move if ever we >>decide we want more system tablespaces. It also makes it easier to dump >>non-system tablespaces. >> >> > >Seems like a reasonable suggestion to me. Any objections? > >BTW, another argument for this is that "default" is a reserved word. >I'd already noticed in testing that CREATE TABLE ... TABLESPACE default >doesn't work unless you double-quote "default". Calling it pg_default >would avoid that annoyance. > > CREATE .... TABLESPACE DEFAULT with default as keyword seems reasonable too, with default -> pg_default. I could think of cases where temporary schemas should go to a different tablespace, but AFAICS since these are created implicitely there's no way to redirect them. Maybe an additional attribute in pg_database for a default temp tablespace is desirable? Regards, Andreas
Andreas Pflug <pgadmin@pse-consulting.de> writes:
> I could think of cases where temporary schemas should go to a different
> tablespace, but AFAICS since these are created implicitely there's no
> way to redirect them. Maybe an additional attribute in pg_database for a
> default temp tablespace is desirable?
By default, temp tables will live in the database's default tablespace,
which is not necessarily the pg_default tablespace. (Hmm, there's
another good reason for renaming it ... if I'd said "default" tablespace
I'd have had to go out of my way to make it clear what I meant.) This
arguably is sufficient control. In any case, I'd prefer not to add a
knob to relocate temp stuff until there's proven need for it. We can
always add features later, but inventing stuff because somebody might
need it is a recipe for overdesign. (Remember that you can always
redirect a specific temp table to a specific tablespace when you
create it.)
The other thing I think people might possibly want to move around is
pg_largeobject. If Gavin finishes ALTER TABLE SET TABLESPACE (or
whatever we call it), that should provide a sufficient answer there.
regards, tom lane
On Sat, 19 Jun 2004, Tom Lane wrote: > [ switching to pghackers for wider comment ] > > Christopher Kings-Lynne <chriskl@familyhealth.com.au> writes: > > By the way, I think that we should deny users the ability to create > > tablespaces that begin with pg_. Also, the existing ones should be > > pg_global and pg_default. That way, we have room to move if ever we > > decide we want more system tablespaces. It also makes it easier to dump > > non-system tablespaces. > > Seems like a reasonable suggestion to me. Any objections? > > BTW, another argument for this is that "default" is a reserved word. > I'd already noticed in testing that CREATE TABLE ... TABLESPACE default > doesn't work unless you double-quote "default". Calling it pg_default > would avoid that annoyance. Great idea. I recognised that default was reserved and was using "default" in testing. I meant to raise this for discussion when I submitted the patch. pg_default/pg_global are great. Gavin