postgresql : database and table size via sql

- questa query può essere utile per eseguire un monitor dello spazio su disco dei db/tabelle.

psql

postgres=# select * from pg_size_pretty(pg_database_size('nomedeldb'));


pg_size_pretty
----------------
1345 MB
(1 row)

size delle tabelle:

SELECT nspname || '.' || relname AS "relation", pg_size_pretty(pg_total_relation_size(C.oid)) AS "total_size" FROM pg_class C LEFT JOIN pg_namespace N ON (N.oid = C.relnamespace) WHERE nspname NOT IN ('pg_catalog', 'information_schema') AND C.relkind <> 'i' AND nspname !~ '^pg_toast' ORDER BY pg_total_relation_size(C.oid) DESC;

SELECT relname, (relpages * 8) / 1024 AS size_mb FROM pg_class ORDER BY relpages DESC;