Date: Thu, 12 Feb 2015 22:55:20 +0000 (UTC)
From: Kevin Grittner <kgrittn@ymail.com>
Reply-To: Kevin Grittner <kgrittn@ymail.com>
To: Nico Sabbi <nicola.sabbi@poste.it>
Cc: "pgsql-performance@postgresql.org" <pgsql-performance@postgresql.org>
Message-ID: <785380407.2469064.1423781720365.JavaMail.yahoo@mail.yahoo.com>
In-Reply-To: <54DD2DAD.3090503@poste.it>
References: <54DD2DAD.3090503@poste.it>
Subject: Re: Configuration tips for very large database
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Nico Sabbi <nicola.sabbi@poste.it> wrote:

> Can you give any hint on the configuration and on the underlying 
> hardware?

Well, this particular web site has millions of hits per day 
(running up to about 20 queries per hit) from thousands of 
concurrent web users, while accepting logical replication from 
thousands of OLTP users via logical replication, so you probably 
don't need equivalent hardware.  If I recall correctly it is 
running 32 cores with 512GB RAM running two PostgreSQL clusters, 
each multiple TB, and each having a RAID 5 array of 40 drives, 
plus separate controllers and RAID for OS and WAL.

For server configuration, see these Wiki pages for the general
tuning techniques used:

https://wiki.postgresql.org/wiki/Tuning_Your_PostgreSQL_Server

https://wiki.postgresql.org/wiki/Number_Of_Database_Connections

The best course to solve your problem would probably be to review 
those and see what might apply, and if you still have a problem 
pick a specific slow-running query and use the process described 
here:

https://wiki.postgresql.org/wiki/SlowQueryQuestions

--
Kevin Grittner
EDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company


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