Re: [GENERAL] Storing database in WORM devices

Tom Lane suggested a vacuum freeze (? or something like that) for archival
read only data. I got the impression the template databases are freeze
dried for freshness (good to the last bit?) That feature might help as
well in the transition from read-write to read-only.

Rick

Alex Turner
<armtuk(at)gmail(dot)com
> To
Sent by: "GGoshen(at)axsone(dot)com"
pgsql-admin-owner <GGoshen(at)axsone(dot)com>
@postgresql.org cc
doug(at)mcnaught(dot)org,
pgsql-general(at)postgresql(dot)org,
05/11/2005 03:02 pgsql-admin(at)postgresql(dot)org
PM Subject
Re: [ADMIN] [GENERAL] Storing
database in WORM devices
Please respond to
Alex Turner
<armtuk(at)gmail(dot)com
>

If you simply put your database tables in their own tablespace, then
move that tablespace to a WORM device, I can't see why that wouldn't
work as long as you keep all the system tables etc.. on the regular RW
tablespace

Alex Turner
netEconomist

On 5/11/05, GGoshen(at)axsone(dot)com <GGoshen(at)axsone(dot)com> wrote:
> I would like to clarify something.
> I intend to create the database on a re-writable device (not WORM). At
some point, when I no longer want to add/modify the database, I plan to
copy it to the WORM device. Then I would like to be able to access the
database on the WORM device for reading purposes only.
>
> I think that the pg_listener catalog is being written for any user
connection. I am not sure whether I could store the system catalogs
separated from the application table spaces.
>
> -----Original Message-----
> From: Alex Turner [mailto:armtuk(at)gmail(dot)com]
> Sent: Wednesday, May 11, 2005 3:41 PM
> To: Goshen, Galit
> Cc: doug(at)mcnaught(dot)org; pgsql-general(at)postgresql(dot)org;
> pgsql-admin(at)postgresql(dot)org
> Subject: Re: [GENERAL] Storing database in WORM devices
>
> I think simply initialising the system causes writes in the system
> tables and the WAL...
>
> I'm sure someone more knowledgeable can chime in.
>
> Alex. Turner
> netEconomist
>
> On 5/11/05, GGoshen(at)axsone(dot)com <GGoshen(at)axsone(dot)com> wrote:
> > Why? Any specific reason that you are aware of ?
> > Are there any writes done to the database when read only SQL statements
are issued?
> >
> >
> > -----Original Message-----
> > From: Douglas McNaught [mailto:doug(at)mcnaught(dot)org]
> > Sent: Wednesday, May 11, 2005 2:51 PM
> > To: Goshen, Galit
> > Cc: pgsql-general(at)postgresql(dot)org; pgsql-admin(at)postgresql(dot)org
> > Subject: Re: [GENERAL] Storing database in WORM devices
> >
> > <GGoshen(at)axsone(dot)com> writes:
> >
> > > I would like to store the complete database into a WORM device (Write
Once
> > > Read Many). I would like to access this database directly from the
WORM
> > > device and perform read only SQL statements against this device.
> > >
> > > Does anyone have such installation, or can determine if this is
possible?
> >
> > AFAIK Postgres will not currently run on a read-only filesystem.
> >
> > -Doug
> >
> > ---------------------------(end of
broadcast)---------------------------
> > TIP 9: the planner will ignore your desire to choose an index scan if
your
> > joining column's datatypes do not match
> >
>

---------------------------(end of broadcast)---------------------------
TIP 8: explain analyze is your friend