De: "Charles Clavadetscher" <clavadetscher@xxxxxxxxxxxx>
Para: "luis.roberto" <luis.roberto@xxxxxxxxxxxxxxx>
Cc: "pgsql-general" <pgsql-general@xxxxxxxxxxxxxxxxxxxx>
Enviadas: Quarta-feira, 30 de setembro de 2020 10:46:39
Assunto: Re: Table sizesHello
On 2020-09-30 14:11, luis.roberto@xxxxxxxxxxxxxxx wrote:
> Hi!
>
> I'm trying to use this query to get table sizes, however I'm getting a
> strange error:
>
> select tablename,pg_relation_size(tablename::text)
> from pg_tables;
>
> In PG 13:
>
> SQL Error [42P01]: ERROR: relation "sql_implementation_info" does not
> exist
>
> In PG 12:
>
> SQL Error [42P01]: ERROR: relation "sql_parts" does not exist
Try like this:
select schemaname,
tablename,
pg_relation_size((schemaname || '.' || '"' || tablename ||
'"')::regclass)
from pg_tables;
You need to schema qualify the tables. Additionally, if you happen to
have table names that have a mix of capital and non capital letters or
contain other characters that might be problematic, you need to enclose
the table name in double quotes.
Regards
Charles
--
Charles Clavadetscher
Swiss PostgreSQL Users Group
Treasurer
Spitzackerstrasse 9
CH - 8057 Zürich
http://www.swisspug.org
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Thanks, this worked.
I wonder though, why calling pg_relation_size('users') work (I don't need to specify the schema).
