Thread: Manage PostgreSQL Connections

On Thu, 14 Aug 2003, Nagy Karoly wrote:

> Is there any way to close the connections of other users in PostgreSQL.
> I wish to run an automatic pg_dump and pg_restore and I guess users must be disconnected first.
> Is that right?

Actually, for a pg_dump, no, you don't need to disconnect people.  pg_dump
creates a single snapshot backup that is consistent across the database
you are backing up (not the whole cluster of databases, just the one
you're pointing pg_dump at at the moment.)

It really depends on what you are doing.  If you're gonna pg_dump / drop
database / create database pg_restore it might be a good idea to
disconnect people  so they don't lost data between the dump and restore.

the easy way to do that is to create an alternate pg_hba.conf in the
$PGDATA directory that only allows the postgresql superuser to attach and
then restart postgresql with that pg_hba.conf in place.

The only thing you want to be aware of is autovacuuming or vacuuming off of a chron script in the middle of dumping.

scott.marlowe wrote:

> On Thu, 14 Aug 2003, Nagy Karoly wrote:
>
>
>>Is there any way to close the connections of other users in PostgreSQL.
>>I wish to run an automatic pg_dump and pg_restore and I guess users must be disconnected first.
>>Is that right?
>
>
> Actually, for a pg_dump, no, you don't need to disconnect people.  pg_dump
> creates a single snapshot backup that is consistent across the database
> you are backing up (not the whole cluster of databases, just the one
> you're pointing pg_dump at at the moment.)
>
> It really depends on what you are doing.  If you're gonna pg_dump / drop
> database / create database pg_restore it might be a good idea to
> disconnect people  so they don't lost data between the dump and restore.
>
> the easy way to do that is to create an alternate pg_hba.conf in the
> $PGDATA directory that only allows the postgresql superuser to attach and
> then restart postgresql with that pg_hba.conf in place.
>
>
> ---------------------------(end of broadcast)---------------------------
> TIP 4: Don't 'kill -9' the postmaster
>

Thank you for the information.

> the easy way to do that is to create an alternate pg_hba.conf in the
> $PGDATA directory that only allows the postgresql superuser to attach and
> then restart postgresql with that pg_hba.conf in place.
By that you mean to have a pg_hba.conf file in  $PGDATA directory named for
example pg_hba.conf.dump and when
I want to perform the backup/restore to rename it to pg_hba.conf and make a
/etc/init.d/postgresql reload?
and by doing that users will not lose their data between the dump and
restore?
I think by doing /etc/init.d/postgresql reload with the new pg_hba.conf
users will be cut of brutaly, or am I wrong?

Thank you again,

> On Thu, 14 Aug 2003, Nagy Karoly wrote:
>
> > Is there any way to close the connections of other users in PostgreSQL.
> > I wish to run an automatic pg_dump and pg_restore and I guess users must
be disconnected first.
> > Is that right?
>
> Actually, for a pg_dump, no, you don't need to disconnect people.  pg_dump
> creates a single snapshot backup that is consistent across the database
> you are backing up (not the whole cluster of databases, just the one
> you're pointing pg_dump at at the moment.)
>
> It really depends on what you are doing.  If you're gonna pg_dump / drop
> database / create database pg_restore it might be a good idea to
> disconnect people  so they don't lost data between the dump and restore.
>
> the easy way to do that is to create an alternate pg_hba.conf in the
> $PGDATA directory that only allows the postgresql superuser to attach and
> then restart postgresql with that pg_hba.conf in place.
>


--
________________________
Nagy K�roly Gabriel
R&D Manager
Expert Software Group
410066 Oradea, Al. Gojdu 2
Tel. +4 0259 230 776
http://www.expert-software.ro
""Nagy Karoly"" <nagykaroly@expert-software.ro> wrote in message
news:000801c3626c$cda8fd20$0301a8c0@karaszexpert...
Is there any way to close the connections of other users in PostgreSQL.
I wish to run an automatic pg_dump and pg_restore and I guess users must be
disconnected first.
Is that right?
________________________
Nagy K�roly Gabriel
R&D Manager
Expert Software Group
410066 Oradea, Al. Gojdu 2
Tel. +4 0259 230 776
http://www.expert-software.ro