查詢單個表

select pg_size_pretty(pg_relation_size('table_name'));

按size大小排序列出所有表

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 limit 20

按照size大小分別列出所有表的table和index

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