Hoe vind je de schijfgrootte van een Postgres / PostgreSQL-tabel en zijn indexen?

Probeer de Database Object Size Functions. Een voorbeeld:

SELECT pg_size_pretty(pg_total_relation_size('"<schema>"."<table>"'));

Voor alle tabellen, iets in de trant van:

SELECT
    table_schema || '.' || table_name AS table_full_name,
    pg_size_pretty(pg_total_relation_size('"' || table_schema || '"."' || table_name || '"')) AS size
FROM information_schema.tables
ORDER BY
    pg_total_relation_size('"' || table_schema || '"."' || table_name || '"') DESC;

Bewerken:hier is de vraag die door @phord is ingediend, voor het gemak:

SELECT
    table_name,
    pg_size_pretty(table_size) AS table_size,
    pg_size_pretty(indexes_size) AS indexes_size,
    pg_size_pretty(total_size) AS total_size
FROM (
    SELECT
        table_name,
        pg_table_size(table_name) AS table_size,
        pg_indexes_size(table_name) AS indexes_size,
        pg_total_relation_size(table_name) AS total_size
    FROM (
        SELECT ('"' || table_schema || '"."' || table_name || '"') AS table_name
        FROM information_schema.tables
    ) AS all_tables
    ORDER BY total_size DESC
) AS pretty_sizes;

Ik heb het iets aangepast om pg_table_size() te gebruiken om metadata op te nemen en de maten op te tellen.