text: SELECT
   c.relname,
   count(*) AS buffers
  FROM pg_class c 
   INNER JOIN pg_buffercache b
    ON b.relfilenode=c.relfilenode 
   INNER JOIN pg_database d
    ON (b.reldatabase=d.oid AND d.datname=current_database())
  GROUP BY c.relname
  ORDER BY 2 DESC
  LIMIT 10;
  
  