From: Rajesh Kumar Mallah <mallah@trade-india.com>
Organization: Infocom Network Limited
To: Bruce Momjian <pgman@candle.pha.pa.us>
Subject: Re: point-in-time recovery
Date: Fri, 25 Apr 2003 21:07:13 +0530
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On Friday 25 Apr 2003 8:41 pm, Bruce Momjian wrote:
> Rajesh Kumar Mallah wrote:
> > On Friday 25 Apr 2003 8:17 pm, Bruce Momjian wrote:
> > > Rajesh Kumar Mallah wrote:
> > > > Thanks for responding , but i still have
> > > > more to discuss.
> > > >
> > > > On Friday 25 Apr 2003 7:47 pm, Bruce Momjian wrote:
> > > > > Rajesh Kumar Mallah wrote:
> > > > > > What is this PITR anyway ?
> > > > > >
> > > > > > when it comes will i be able to
> > > > > >
> > > > > > 1. reduce by pg_dump times ?
> > > > > > 2. can afford to run pg_dump less frequently ?
> > > > > > 3. Will be able to rollback committed transactions of past 5
> > > > > > mins?
> > > > >
> > > > > You can do a dump,
> > > >
> > > > Do u mean pg_dump here, or some special command
> > > > thats doing a quick snapshot dump?
> > >
> > > You do one pg_dump, the start PITR logging.
> >
> > I dunno Abt the general case but we have seen
> > more instances of data loss by our own actions  (faulty SQL eg)
> > rather than HW's or postgresql's
> >
> > Say for my live database.
> > Say i start my pg_dump at 5:00p and it finishes say by 5:30p
> > then i give the command for PITR logging at 5:31
> >
> > Then i accidently delete at say 9pm
> >
> > Then am i expected to :
> > 1. restore the snapshot of 5:00 pm
> > 2. ROLL FORWARD using PITR log till 8:59 or so
> >    using some special command ?
> >
> > In that case what happens to the transactions from 5:00pm
> > to 5:30 pm which were not captured in the pg_dump nor in the
> > PITR log?
>
> You have to start PITR logging probably before the pg_dump so there will
> be some overlap, but the system will know how to handle it.


Thanks for this discussion.
I hope to read more abt in in 7.4 Docs.

My congratulations and regds to the PostgreSQL 
developers for making it what it is today !

Mallah.


-- 
Rajesh Kumar Mallah,
Project Manager (Development)
Infocom Network Limited, New Delhi
phone: +91(11)6152172 (221) (L) ,9811255597 (M)

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