Re: Incremental Backup of a particular database - Mailing list pgsql-admin

From Jason Minion
Subject Re: Incremental Backup of a particular database
Date
Msg-id 261CF9EEB14F5442894AB6DDA93AA6F44EDAD2@mail.siglercompanies.com
Whole thread Raw
In response to Re: Incremental Backup of a particular database  ("Yogvinder Singh" <yogvinder@newgen.co.in>)
Responses Re: Incremental Backup of a particular database
List 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.minion@sigler.com

 


From: pgsql-admin-owner@postgresql.org [mailto:pgsql-admin-owner@postgresql.org] On Behalf Of Yogvinder Singh
Sent: Thursday, January 18, 2007 5:23 AM
To: Shoaib Mir
Cc: pgsql-admin@postgresql.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 -----
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@newgen.co.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@newgen.co.in>
To: "Andy Shellam (Mailing Lists)" <andy.shellam-lists@mailnetwork.co.uk >
Cc: <pgsql-admin@postgresql.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.shellam-lists@mailnetwork.co.uk>
> To: "Yogvinder Singh" <yogvinder@newgen.co.in>
> Cc: < pgsql-admin@postgresql.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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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 content of this message. Please delete it immediately and notify the sender. Newgen Software Technologies Ltd and / or its subsidiary Companies accept no responsibility for loss or damage arising from the use of the information transmitted by this email including damage from virus and further acknowledges that any views expressed in this message are those of the individual sender and no binding nature of the message shall be implied or assumed unless the sender does so expressly with due authority of Newgen Software Technologies Ltd and / or its subsidiary Companies, as applicable.


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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 content of this message. Please delete it immediately and notify the sender. Newgen Software Technologies Ltd and / or its subsidiary Companies accept no responsibility for loss or damage arising from the use of the information transmitted by this email including damage from virus and further acknowledges that any views expressed in this message are those of the individual sender and no binding nature of the message shall be implied or assumed unless the sender does so expressly with due authority of Newgen Software Technologies Ltd and / or its subsidiary Companies, as applicable.

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