Question

I’m using the following code to determine the disk size of each table in my database in postgresql:

 SELECT pg_size_pretty(pg_total_relation_size('"my_schema"."my_table"'));

I imagine that I should find the actual filenames of each table to get the exact disk size. Does anybody know how to determine the actual filenames at file system level?

Answer 1

Something like this:

select t.relname, current_setting('data_directory')||'/'||pg_relation_filepath(t.oid)
from pg_class t
  join pg_namespace ns on ns.oid = t.relnamespace
where relkind = 'r'
and ns.nspname = 'public';

I’m not 100% this will show the correct path if multiple tablespaces are involved.