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Re: Experience with large number of tables in single PostgreSQL instance - Mailing list pgsql-admin

From Prashanth Ranjalkar
Subject Re: Experience with large number of tables in single PostgreSQL instance
Date
Msg-id CAMBytERmO4wbYO5YtZ0av_UavM2CVa_DVOgHFjEE3wM3GQNVtA@mail.gmail.com
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In response to Re: Experience with large number of tables in single PostgreSQL instance  (Dale Betts <dale.betts@hssnet.com>)
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Every table or index is created in the form of OS files therefore max open files need to be set appropriately in order to achieve the larger table count. There would be no limitation for creation of tables in PostgreSQL and performance would be the major criteria as catalogs get overburdened. 

 
Thanks & Regards,
 
Prashanth Ranjalkar
Database Consultant & Architect
Skype:prashanth.ranjalkar


On Wed, Apr 10, 2013 at 2:13 PM, Dale Betts <dale.betts@hssnet.com> wrote:
I'd agree, certainly in my experiences.

You need to ensure OS parameters such as the max open files (fs.file-max if we're talking Linux) is set appropriately. Baring in mind each user will have an open file on each underlying datafile for the databases they're connected to.

Dale
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On 10/04/2013 08:24, Vasilis Ventirozos wrote:



On Wed, Apr 10, 2013 at 10:10 AM, Vedran Krivokuca <vkrivokuca@gmail.com> wrote:
On Wed, Apr 10, 2013 at 9:07 AM, Vedran Krivokuca <vkrivokuca@gmail.com> wrote:
> 1) we can go with different instances of PostgreSQL service, let's say
> (for pure theory) 10 of them on the same HA cluster setup. Every
> instance would hold let's say 1/10th of that big recordset, and around
> 3.000 database tables (this apparently shouldn't be of any problem to
> PostgreSQL, see below).

I am talking shit here, obviously, excuse me. We would go with, for
example, 10 or 100 databases in the same PostgreSQL instance.
Buzzwording got better of me. :) The rest of my initial e-mail still
applies, I will cherish any input of experience on this subject.


V.

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I think that a limitation would be on the OS (filesystem and kernel) because each table 
is a file (or more) under a directory (per database). I haven't got experience on how 

modern Linux system cope with that but i think it would be something easy to test.
Database wise you shouldn't have a problem.



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