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Re: Incremental Backup of a particular database

From: "Jason Minion" <jason(dot)minion(at)sigler(dot)com>
To: "Yogvinder Singh" <yogvinder(at)newgen(dot)co(dot)in>,"Shoaib Mir" <shoaibmir(at)gmail(dot)com>
Cc: <pgsql-admin(at)postgresql(dot)org>
Subject: Re: Incremental Backup of a particular database
Date: 2007-01-18 16:02:03
Message-ID: 261CF9EEB14F5442894AB6DDA93AA6F44EDAD2@mail.siglercompanies.com (view raw or flat)
Thread:
Lists: pgsql-admin
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 
	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)
	
	
	On 1/18/07, Yogvinder Singh < 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>
		To: "Andy Shellam (Mailing Lists)"
<andy(dot)shellam-lists(at)mailnetwork(dot)co(dot)uk >
		Cc: <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>
		> To: "Yogvinder Singh" <yogvinder(at)newgen(dot)co(dot)in>
		> Cc: < 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,
		> > > !DSPAM:37,45ae2b2f137105304223843! Disclaimer :-
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Disclaimer :- This e-mail message including any attachment may contain
confidential, proprietary or legally privileged information. It should
not be used by who is not the original intended recipient. If you have
erroneously received this message, you are notified that you are
strictly prohibited from using, copying, altering or disclosing the
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sender. Newgen Software Technologies Ltd and / or its subsidiary
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