Re: Incremental Backup of a particular database

I've been thinking about PITR. Since we have one production instance
and one test instance of Postgres, in order to perform a PITR
on any particular database would require reloading the entire instance
onto another server, and extracting what I needed. Clunky, but
do-able.

From my Informix years, I remember a tool that would read your backups,
and extract out whatever you wanted, down to a table level
SQL. Wouldn't that be ideal....

Jason Minion wrote:
> There is no incremental backup process that focuses on an individual
> database for PostgreSQL. Anything that has to do with PITR on a
> PostgreSQL installation is system-wide, and cannot be configured to
> support a single database out of many in an installation. If you need
> to support PITR with a single database, you will need to initdb
> another directory and set up another PostgreSQL postmaster to manage
> that installation separate from your primary installation (and on a
> different port, etc), or set up PostgreSQL for that specific database
> on another server.
>
> Also, there really are no incremental backup tools for PostgreSQL,
> assuming you are looking at an incremental backup in the way that the
> Progress database system takes an incremental backup (copy of all of
> the blocks changed since the last full or incremental backup).
> PostgreSQL has PITR, which is a roll-forward system using log data
> from a full point-in-time backup, as well as pg_dump. One could say
> that the log files are the incremental backups. However, many
> commercial database systems (that many are migrating to PostgreSQL
> from) provide both an "incremental" backup option (very fast
> recovery) as well as a "log based recovery" option (slow recovery),
> and of the two, PostgreSQL supports only the log based recovery
> through PITR.
>
> Please correct me where possible guys, I enjoy the stability and
> useability of my PostgreSQL very much, but I have to admit that I lose
> a bit more sleep over it than some other db's with regards to recovery
> time in a DR scenario. I am very eager to see where we go in the future.
>
> Jason Minion
> jason(dot)minion(at)sigler(dot)com
>
>
>
> ------------------------------------------------------------------------
> *From:* pgsql-admin-owner(at)postgresql(dot)org
> [mailto:pgsql-admin-owner(at)postgresql(dot)org] *On Behalf Of *Yogvinder Singh
> *Sent:* Thursday, January 18, 2007 5:23 AM
> *To:* Shoaib Mir
> *Cc:* pgsql-admin(at)postgresql(dot)org
> *Subject:* Re: [ADMIN] Incremental Backup of a particular database
>
> So it means there is no way i can take incremental backup of one of
> the databases from a postgresql database server??
>
> Regards,
> Yogvinder Singh,
> Software Engineer, E-WorkStyle Group,
> Newgen Software Technologies Ltd.
> D-152, Okhla Phase - 1
> New Delhi
> Tel no 26815467 Ext 143
>
>
>
> ----- Original Message -----
> *From:* Shoaib Mir <mailto:shoaibmir(at)gmail(dot)com>
> *To:* Yogvinder Singh <mailto:yogvinder(at)newgen(dot)co(dot)in>
> *Cc:* pgsql-admin(at)postgresql(dot)org <mailto:pgsql-admin(at)postgresql(dot)org>
> *Sent:* Thursday, January 18, 2007 4:07 PM
> *Subject:* Re: [ADMIN] Incremental Backup of a particular database
>
> When the pg_dump process starts it takes one point and then makes
> a backup for that specific time even if more updates on the
> database are happening during the pg_dump process. So when you
> restore on the other machine it will restore to that specific time
> when the pg_dump process started.
>
> ----------------
> Shoaib Mir
> EnterpriseDB (www.enterprisedb.com <http://www.enterprisedb.com>)
>
> On 1/18/07, *Yogvinder Singh* < yogvinder(at)newgen(dot)co(dot)in
> <mailto:yogvinder(at)newgen(dot)co(dot)in>> wrote:
>
> pg_dump is a utility for saving a PostgreSQL database into a
> script or an
> archive file. The script files are in plain-text format and
> contain the SQL
> commands required to reconstruct the database to the
> state it was in
> at the time it was saved.
>
> "At the time it was saved" What is the meaning of this statement?
>
>
> Regards,
> Yogvinder Singh,
> Software Engineer, E-WorkStyle Group,
> Newgen Software Technologies Ltd.
> D-152, Okhla Phase - 1
> New Delhi
> Tel no 26815467 Ext 143
>
>
> ----- Original Message -----
> From: "Yogvinder Singh" <yogvinder(at)newgen(dot)co(dot)in
> <mailto:yogvinder(at)newgen(dot)co(dot)in>>
> To: "Andy Shellam (Mailing Lists)"
> <andy(dot)shellam-lists(at)mailnetwork(dot)co(dot)uk
> <mailto:andy(dot)shellam-lists(at)mailnetwork(dot)co(dot)uk>>
> Cc: <pgsql-admin(at)postgresql(dot)org
> <mailto:pgsql-admin(at)postgresql(dot)org>>
> Sent: Thursday, January 18, 2007 10:44 AM
> Subject: Re: [ADMIN] Incremental Backup of a particular database
>
>
> > I only want one of many databases to be restored to the
> other server
> > incrementally.
> > Is this possible?
> > If yes, Wht are the steps??
> >
> > Regards,
> > Yogvinder Singh,
> > Software Engineer, E-WorkStyle Group,
> > Newgen Software Technologies Ltd.
> > D-152, Okhla Phase - 1
> > Tel no 26815467 Ext 143
> >
> >
> > ----- Original Message -----
> > From: "Andy Shellam (Mailing Lists)"
> < andy(dot)shellam-lists(at)mailnetwork(dot)co(dot)uk
> <mailto:andy(dot)shellam-lists(at)mailnetwork(dot)co(dot)uk>>
> > To: "Yogvinder Singh" <yogvinder(at)newgen(dot)co(dot)in
> <mailto:yogvinder(at)newgen(dot)co(dot)in>>
> > Cc: < pgsql-admin(at)postgresql(dot)org
> <mailto:pgsql-admin(at)postgresql(dot)org>>
> > Sent: Wednesday, January 17, 2007 8:17 PM
> > Subject: Re: [ADMIN] Incremental Backup of a particular database
> >
> >
> > > I believe the option for a "warm standby" (which sounds
> like it is what
> > > you need) was made available in 8.2.0.
> > > You'd have to look at the manual though, I haven't had
> time to
> > > investigate, and I'm not sure whether it's cluster-wide, or
> > > database-specific.
> > >
> > >
> > > Yogvinder Singh wrote:
> > > > Hi Ppl,
> > > >
> > > > I have Two PostgreSQL Database Servers. The situation is
> like this:-
> > > > 1) On first database server ball the operations (i.e
> live server) will
> > > > be done. This server may contain n number of databases.
> > > >
> > > > 2) On the second database server, i want to keep one
> particular
> > > > database (from the first database server ) and keep it
> updated to the
> > > > latest from the First Database Server. I just want to be
> able to take
> > > > some sort of incremental backup from the first server
> and restore it
> > > > to the second server.
> > > >
> > > > Is this situation feasible. How can i take an
> incremental backup of a
> > > > particular database out of many databases? On which
> version this is
> > > > supported? IF not supported, is there any alternative
> way to handle
> > > > this situatio.
> > > >
> > > > Regards,
> > > > Yogvinder Singh,
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