Message-ID: <73cc9d9102a5568834c3473f9cb69099efb46768.camel@cybertec.at>
Subject: Re: How to restrict schema size per tenant
From: Laurenz Albe <laurenz.albe@cybertec.at>
To: niraj nandane <niraj.nandane@gmail.com>, pgsql-admin@postgresql.org
Date: Sat, 06 Jul 2024 07:46:15 +0200
In-Reply-To: <cacb3b0efc193defb8e595566c9b892833b79341.camel@cybertec.at>
References: 
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On Fri, 2024-07-05 at 17:33 +0200, Laurenz Albe wrote:
> On Fri, 2024-07-05 at 20:03 +0530, niraj nandane wrote:
> > We are using Postgres schema based tenancy approach for our SaaS applic=
ation.
> > We create schema per tenant. We have Postgres instance in HA mode.
> > We have multiple micro services and each service have its own database.
> > For eg. Auth service have auth database, audit have audit. Inside each =
database,
> > we create schema per tenant. We want to restrict usage to 10GB per tena=
nt combined
> > across all database. Is there any tool or built in way to monitor this =
in Postgres?
>=20
> I don't know any.  You'll have to run a query like
>=20
> SELECT sum(pg_total_relation_size(t.oid)),
>        s.nspname
> FROM pg_class AS t
>    RIGHT JOIN pg_namespace AS s
>       ON t.relnamespace =3D s.oid
> WHERE NOT s.nspname LIKE ANY (ARRAY['pg\_catalog','pg\_toast%','informati=
on\_schema','pg\_temp%'])
> GROUP BY s.nspname;

Sorry, I forgot to restrict the query to tables.  It should be

SELECT sum(pg_total_relation_size(t.oid)),
       s.nspname
FROM pg_class AS t
   RIGHT JOIN pg_namespace AS s
      ON t.relnamespace =3D s.oid
WHERE NOT s.nspname LIKE ANY (ARRAY['pg\_catalog','pg\_toast%','information=
\_schema','pg\_temp%'])
  AND t.relkind =3D 'r'
GROUP BY s.nspname;

Yours,
Laurenz Albe