"lio bod" <liobod.slony at gmail.com> writes:
> I got a metaphysical question.;-)
>
> In fact, it's more an internal architeture slony question :
>
>  
>
> I replicate my first db following documenation ' 2. Replicating Your First Database' (http://slony.info/documentation/firstdb.html)
>
> This sample is not very precise on what command should be performed on master or slave host.
>
> I tried 'slon_start 2' on master host. I was quite sure it would failed.
>
> Nope. I'm surprised : my replication seems to be ok. Magic!
>
>  
>
> What would be a good recommandation?
>
> Run 'slon_start 2' on master or on salve host?

Well, I have two answers to that, and they may differ from what you expect :-).

1.  On our systems, at Afilias, we never run slon processes on
    database servers.  We instead run all the slons centrally on an
    application server.

2.  If the choice is between master and slave, I'd be somewhat
    inclined to run both slons on the "master" server, as...

    - Life tends to be simpler if they both run on one server, as
      you can more readily manage processes on one host, and as
      log files will naturally be on one server.

    - It is essential that a slon be kept running against the master
      node, as if it is not, for a period of time, then when it
      is restarted, that entire period of time will be treated as
      One Big Long SYNC, and having such a huge SYNC is likely to
      turn out badly :-(.
-- 
(reverse (concatenate 'string "ofni.sesabatadxunil" "@" "enworbbc"))
http://linuxdatabases.info/info/internet.html
"... The book [CLtL1] is about  400 pages of 8.5" by 11" Dover output.
Apparently  the publisher and  typesetter decided  that this  made the
lines too wide for  easy reading, so they will use a  6" by 9" format.
This  will make  the shape  of the  book approximately  cubical.  Now,
there are  26 chapters counting the  index, and a Rubik's  cube has 26
exterior cubies.  I'll let  you individually extrapolate and fantasize
from there."  -- GLS