title: Determining the actual filenames of the tables in PostgreSQL at file system level
body: <p>I'm using the following code to determine the disk size of each table in my database in postgresql:</p>
  
  <pre><code> SELECT pg_size_pretty(pg_total_relation_size('"my_schema"."my_table"'));
  </code></pre>
  
  <p>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?</p>