The following documentation comment has been logged on the website: Page: https://www.postgresql.org/docs/9.5/static/disk-usage.html Description:
PostgreSQL 9.5.14 Documentation / Chapter 28. Monitoring Disk Usage / 28.1. Determining Disk Usage (Applies for other Versions, too.) I'm wondering if the two statements given showing the index space size as described. I've the impression they show the space size of the tables. Regards --Michael Extract of the manual: You can easily display index sizes, too: SELECT c2.relname, c2.relpages FROM pg_class c, pg_class c2, pg_index i WHERE c.relname = 'customer' AND c.oid = i.indrelid AND c2.oid = i.indexrelid ORDER BY c2.relname; relname | relpages ----------------------+---------- customer_id_indexdex | 26 It is easy to find your largest tables and indexes using this information: SELECT relname, relpages FROM pg_class ORDER BY relpages DESC; relname | relpages ----------------------+---------- bigtable | 3290