Message-ID: <0adf6b95e08946113f12415e6f95fc74d2bc1a06.camel@cybertec.at>
Subject: Re: Postgresql - Pgbouncer Connection and Query Performance Problem
From: Laurenz Albe <laurenz.albe@cybertec.at>
To: Abdullah Ergin <abdullaherginwork@gmail.com>,
	pgsql-admin@lists.postgresql.org
Date: Tue, 02 Apr 2024 15:26:32 +0200
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On Tue, 2024-04-02 at 15:39 +0300, Abdullah Ergin wrote:
> We are using prepared transactions in PostgreSQL. We use pgbouncer as our=
 pooling software.

> [...] I am now experiencing significant slowdowns in my queries.
> I attribute this to two parameters in my PostgreSQL clusters and three pa=
rameters in pgbouncer.
> Firstly, on my server, I have 15 PostgreSQL clusters, and the values of t=
hese two
> parameters in the=C2=A0postgresql.conf=C2=A0file of each cluster seem ver=
y high;
>=20
> max_connection =3D 4096
> max_prepared_transaction =3D 4096

Yes, they are very high, but they are just limits.  As long as you don't ac=
tually
establish hundreds of connections, that is not a problem.

> On the other hand, the values I find high in pgbouncer are;
> max_db_connections =3D 8192
> default_pool_size =3D 4096
> max_client_conn =3D 2048
> Could these high values be causing excessive load on pgbouncer?
> I have actively 15,000 customers on my server, and there is an average da=
ta flow
> of 5 million daily (including updates). What should be the value of these=
 parameters?
> I changed the specified three parameters in pgbouncer to the following va=
lues;
> max_db_connections =3D 500
> default_pool_size =3D 300
> max_client_conn =3D 500
>=20
> Currently, it seems like my query performance has improved, but what shou=
ld I do to
> permanently solve this? What other parameters should I pay attention to b=
esides these?

"max_client_conn" is not the problem.  The problem is the excessively high =
pool
size of 300.  The size should be so that when all those connections are bus=
y running
statements, your database should not be overloaded.

Yours,
Laurenz Albe