Re: Trigger Function and backup - Mailing list pgsql-general

On Jun 23, 10:20 am, laconi...@gmail.com (Andrew Smith) wrote:
> Arndt,
>
> Your website says rubyrep runs on Linux and Windows - am I going to have
> difficulties if I want to try it on Solaris 10?
>
> Andrew
>
> 2009/6/23 Arndt Lehmann <arndt.lehm...@gmail.com>
>
> > On Jun 16, 7:48 pm, nishkars...@rediffmail.com (Nishkarsh) wrote:
> > > Hi Merlin, thanks for the detailed input.
>
> > > As per ur suggestion i will try to implement Slony-I.
>
> > > I think i will need some help to do it.
>
> > > I am useing Postgres 8.3.7, on Windows.
>
> > > I was following the Slony-I example in the help for pgAdmin III. I am
> > able
> > > to perform the steps from 1-7. Step 8 : create Slony-I cluster i am
> > getting
> > > a msg in the interface
>
> > > "Slony-I creation script no available; only join possible"
>
> > > On doing some research i found some scripts to be copied (I was not able
> > to
> > > find very clear instruction) or give slony-I path. i tried all that but
> > was
> > > not able to move ahead.
>
> > > Can u plz guide me through &-(%-|
>
> > > Regards
> > > Nishkarsh
>
> > > Merlin Moncure-2 wrote:
>
> > > > On Mon, Jun 15, 2009 at 4:29 AM, Nishkarsh<nishkars...@rediffmail.com>
> > > > wrote:
> > > >> Hello every one,
>
> > > >> I am new to databases. I am using Postgres 8.2 (Migrating to 8.3.7 in
> > few
> > > >> days) on windows platform.
>
> > > >> I had tried using Slony-I for replication and was not able to create a
> > > >> cluster.
>
> > > >> After struggling for some time i decide to implement a way around to
> > take
> > > >> differential backup. As the tables getting changed were very less.
>
> > > >> Here is what i intend to do:
>
> > > >> - Write a trigger for each of the tables in concern
> > > >> - Some how write a function which can copy / execute the same query in
> > > >> another temp Db on the same physical system (I have no idea how to do
> > > >> that)
> > > >> - Take a backup of temp DB which will be the differential backup of DB
> > > >> (We
> > > >> need to clear temp db after backup)
>
> > > >> Am i going in the right direction?
> > > >> Is there any way i can implement it.
> > > >> Any help will be really of great help
>
> > > > Generating a full trigger based replication system on your own is
> > > > IMNSHO crazy.  Slony is the best solution to this problem (trigger
> > > > replication with postgres) that I know of, and is probably better than
> > > > any one person to come up with in a reasonable amount of time.
> > > > Probably, your best course of action if you need to get things running
> > > > right now is to give slony another go (why did you not succeed?).
>
> > > > Hand written trigger replication is ok if you need to copy, say, a
> > > > couple of tables or you have some other very specific requirement.  In
> > > > particular, copying an insert to a mirror database with trigger
> > > > function wrapping dblink is a snap (updates are more problematic, but
> > > > doable).  Of course, you need to figure out how to deal with schema
> > > > updates and other issues that plague replication systems such as
> > > > volatile data in cascading triggers (just to name one).  General
> > > > purpose trigger replication is a huge project...
>
> > > > It sounds to me that what you really want is the 'hot standby' feature
> > > > that unfortunately missed the cut for 8.4.  Hot standby is probably
> > > > the easiest way to mirror a database for purposes of read only
> > > > querying.  There are no triggers to worry about, just a few .conf
> > > > settings and some other setup to get going (more or less, it isn't
> > > > finalized yet).  So maybe, waiting for hot standby (or even, digging
> > > > up a hot standby patch and trying to apply it vs. 8.4 if your
> > > > adventurous) is the answer.
>
> > > > Another possibility is to look at statement level replication, like
> > > > pgpool.
>
> > > > merlin
>
> > > > --
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> > > > To make changes to your subscription:
> > > >http://www.postgresql.org/mailpref/pgsql-general
>
> > > --
> > > View this message in context:
> >http://www.nabble.com/Trigger-Function-and-backup-tp24030638p24051851...
> > > Sent from the PostgreSQL - general mailing list archive at Nabble.com.
>
> > > --
> > > Sent via pgsql-general mailing list (pgsql-gene...@postgresql.org)
> > > To make changes to your subscription:
> >http://www.postgresql.org/mailpref/pgsql-general
>
> > Hi Merlin,
>
> > you could also consider giving "rubyrep" a try.
> > Like Slony it is also an open source, trigger based, asynchronous
> > replication solution.
>
> > Focus of rubyrep is easy setup.
> > Tutorial, screencast and other information are available on the
> > project website:
> >    http://www.rubyrep.org
>
> > Best Regards,
> >  Arndt Lehmann
>
> > (Disclosure: I wrote rubyrep)
>
> > --
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> >http://www.postgresql.org/mailpref/pgsql-general
>
>

Hi Andrew,

I never tried on Solaris. But as (the JRuby) version is based on Java
(1.6), I cannot think of any reason why it wouldn't work.

I would appreciate if you could give it a try and let me know how it
goes.

Best Regards,
  Arndt