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Re: Is postgresql ca do the job for software deployed in ASP

From: David Gagnon <dgagnon(at)siunik(dot)com>
To: Mikael Carneholm <Mikael(dot)Carneholm(at)WirelessCar(dot)com>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: Is postgresql ca do the job for software deployed in ASP
Date: 2006-07-04 11:55:58
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-performance
Hi All,
  First thanks for your help everyone! 

Mikael Carneholm wrote:
> Do you really need to create one *DB* per client - that is, is one
> schema (in the same DB) per client out of the question? If not, I would
> look into moving all reference tables (read-only data, constants and
> such) into a common schema (with read permission granted to each
> client/role), that way reducing the amount of objects needed to be
> created/maintained and at the same time reducing the memory requirements
> (lots of shared objects == lots of reused shared buffers). 
For my application there is very little info I can share.  Maybe less 
than 10 on 100 actually so I not sure it worth it ...

> Set the
> default_tablespace variable per client (login role) also so that the I/O
> load can be balanced. A system based on Opterons such as the HP DL385 or
> DL585 with two CPUs (or four if you go for the 585), 8-16Gb of RAM and a
> decent storage system with 14-28 disks could be worth evaluating.
> /Mikael
I look into the HP DL385 and DL585 on HP site and they are price between 
3000 and 15000$$ (base price).  Thats quite a difference?  So is the HP 
DL385 with 2 cpus will do the job ?

I will look more deeply into them in detail trying to understand 
something ...

Thanks for your help!
Best Regards

> -----Original Message-----
> From: pgsql-performance-owner(at)postgresql(dot)org
> [mailto:pgsql-performance-owner(at)postgresql(dot)org] On Behalf Of David
> Gagnon
> Sent: den 3 juli 2006 13:42
> To: pgsql-performance(at)postgresql(dot)org
> Subject: [PERFORM] Is postgresql ca do the job for software deployed in
> ASP ou SaaS mode?
> Hi all,
>   I've been working on my personal project for 3.5 years now.  I
> developed an ERP system in web/java.  Now the people I will work with
> suggest to offers it in Saas mode.  Which means my customer will connect
> to my website and found they ERP software and data there.  It's not the
> deployment I planned initially so if you can just validate some
> technicals points to be sure it's not crazy using Postgresl here and not
> a big $$$ db to do the job.
> Typically I will have 1db per client and around 150 tables per db.  So
> since I hope I didn`t work all those year for nothing .. I expect to
> have bunch of clients witch means the same amount of db since I have 1
> db/client. 
> Can I hope having several hundred of db on 1 db server?  Like 250 dbs =
> 250 client = 360 000 tables !!!
> So is there a limit for the number of db in the db server ?(this spec is
> not on the website) What about the performance? Can I expect to have the
> same performance? 
> Since I put everything on the web I do needs an High Availability
> infrastructure.  I looked into SlonyI and Mammoth to replicate the db
> but since SlonyI use triggers can I expect it to do the job?  Is Mammoth
> is the only available solution?
> Last question and not the least  I'm reading this performance list for
> several years now and know suggestion about hardware to run postgresl is
> discussed.  Since I wrote software there severals points about hardware
> that I don`t understand.  Do you have any suggestion of platform to run
> into my Saas configuration?  I do need the WISE one!  I'm pretty sure
> that if I was a big company I would be able throw bunch of $$$$ but it's
> not my case.  I'm pretty sure it exists out there some piece of Hardware
> that would do the job perfectly with a fair price.
> So far I did understand that Postgresql loves Opteron and I have looked
> into the dl145 series of HP.  I did understand that Dell Hardware it`s
> not reliable.  But it's still not clear what should be my requirement
> for memory, disk, nb cpu, cpu power, etc.
> I'm pretty sure it`s better to have more slower CPUs that having the
> latest Opteron available on the market, or more slower servers that
> having the fastest one...  am I right?  But agains what it`s the optimal
> choice?
> Thanks you to share your knowledge on those point.  I do consider using
> Postgresql is the Smart choice in my project since the beginning but
> before putting all the money (That I don`t have ..:-)) to buy some
> hardware I just want to be sure I'm not crazy!
> Thanks for your help I really appreciate it!!
> Best Regards
> /David
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