hi,
I have the backup of the usr/local/pgsql/data folder
can i use this to manually export all the databases to some other same version installation of postgres?
if possible, how come...
if not possible why ?
thnks in advance
yogi

it doesnt work that way.... this is postgreSQL -- a relational database.....
you can't just copy the data directory like you can with mySQL or DBase, or
BTrieve or any of the "old-school" databases... if you need to backup and
restore data you need to look at pg_dump and pg_dumpall and the import
statements in psql...

""Yogvinder Singh"" <yogvinder@newgen.co.in> wrote in message
news:012701c5ea9a$dbab31a0$5605a8c0@ng3054...
hi,
I have the backup of the usr/local/pgsql/data folder
can i use this to manually export all the databases to some other same
version installation of postgres?
if possible, how come...
if not possible why ?
thnks in advance
yogi

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"codeWarrior" <gpatnude@hotmail.com> writes:
> it doesnt work that way.... this is postgreSQL -- a relational database.....
> you can't just copy the data directory like you can with mySQL or DBase, or
> BTrieve or any of the "old-school" databases... if you need to backup and
> restore data you need to look at pg_dump and pg_dumpall and the import
> statements in psql...

Actually, that's wrong.

You certainly *can* copy the set of data directories; there is no
particular magic here.

The data is stored as a set of files in a set of directories; for
there to be some other "magical something else" would seem very
strange.

What you generally can't do safely is to take a copy while the
postmaster is up and running, as you risk parts of the data not being
consistent with one another.

If your OS or disk hardware supports some sort of "snapshotting"
technology, so that you can grab a copy of the whole thing as an
instant atomic operation, that provides a way to grab a copy while
postmaster is running. If not, then you have to take a copy while the
postmaster is shut down.

The resulting filesystem copy will only be compatible with the same
major version of PostgreSQL, and with versions running on the same
architecture, but that can still let it be useful.
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On Thu, Nov 17, 2005 at 02:04:42PM -0500, Chris Browne wrote:
> If your OS or disk hardware supports some sort of "snapshotting"
> technology, so that you can grab a copy of the whole thing as an
> instant atomic operation, that provides a way to grab a copy while
> postmaster is running. If not, then you have to take a copy while the
> postmaster is shut down.

It's also worth noting that you _really really_ want to test that
snapshotting capability. I've heard some people grumble about "it
didn't work for me" or some such. There are others who've reported
it works (and it ought to, if the snapshots work as advertised --
just be sure you know what the snapshots actually are).

A

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> On Thu, Nov 17, 2005 at 02:04:42PM -0500, Chris Browne wrote:
>> If your OS or disk hardware supports some sort of "snapshotting"
>> technology, so that you can grab a copy of the whole thing as an
>> instant atomic operation, that provides a way to grab a copy while
>> postmaster is running. If not, then you have to take a copy while the
>> postmaster is shut down.
>
> It's also worth noting that you _really really_ want to test that
> snapshotting capability. I've heard some people grumble about "it
> didn't work for me" or some such. There are others who've reported
> it works (and it ought to, if the snapshots work as advertised --
> just be sure you know what the snapshots actually are).

To add a grumble, of sorts...

People get all excited about separating WAL onto separate disk, to
improve performance.

Unfortunately, if you do that, that separates the database into two
portions, "splitting the atom," as it were. You'll no longer be able
to get that atomic snapshot. Oops.
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