查询每张表占用磁盘空间
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查询所有表占用的磁盘空间
select sum(t.size) from (
SELECT table_schema || '.' || table_name AS table_full_name, 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
) t