[pgpool-general: 6355] Re: question regarding pgpool effiecncy in my case

[Mariel Cherkassky]

A child cant have 3 connections to the same database with the same user
right ? In other words, If I have only one database and one user I should
set max_pool to 1 ?

‫בתאריך יום ו׳, 14 בדצמ׳ 2018 ב-1:29 מאת ‪Bo Peng‬‏ <‪pengbo at sraoss.co.jp
‬‏>:‬

> Hi,
>
> On Sun, 9 Dec 2018 15:00:33 +0200
> Mariel Cherkassky <mariel.cherkassky at gmail.com> wrote:
>
> > Hi,
> > I'm trying to implement pgpool2 in our environment but in our performance
> > tests it seems that when we use pgpool the performance are worse.
> > Therefore, I wanted to check if pgpool is the right solution based on the
> > next info that I read :
> > " process opens a new backend connection only if the requested
> > [user,database] pair is not already in the cache. So if the application
> > uses only one user to connect to only one database, say [pguser1,pgdb1],
> > then each child will continue to reuse the first connection and will
> never
> > open a second connection, so in effect pgpool will open no more than 100
> > backend connections even though max_pool is set to 3."
> >
> > In my case, I have 3 databases and for every database I have a dedicated
> > user. The application access each of those databases with a dedicated
> user.
> > Now basicaly, if my max_connections is set to 500, pgpool max_pool set
> to 3
> > and the num_of_init_children is set to 100 it means that at every moment
> I
> > can have at most 100 sessions to each one of the  databases (with
> pgpool..).
>
> If you set
>   max_pool = 3
>   num_init_children = 100
>
> you can have most 300 sessions to backend servers.
>
>
> > Thanks , Mariel.
>
>
> --
> Bo Peng <pengbo at sraoss.co.jp>
> SRA OSS, Inc. Japan
>
>
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