contrib/pg_freespacemap/pg_freespacemap.sql.in

   1 /* $PostgreSQL$ */
   2
   3 -- Adjust this setting to control where the objects get created.
   4 SET search_path = public;
   5
   6
   7 -- Register the C function.
   8 CREATE OR REPLACE FUNCTION pg_freespace(regclass, bigint)
   9 RETURNS int2
  10 AS 'MODULE_PATHNAME', 'pg_freespace'
  11 LANGUAGE C STRICT;
  12
  13 -- pg_freespace shows the recorded space avail at each block in a relation
  14 CREATE OR REPLACE FUNCTION
  15   pg_freespace(rel regclass, blkno OUT bigint, avail OUT int2)
  16 RETURNS SETOF RECORD
  17 AS $$
  18   SELECT blkno, pg_freespace($1, blkno) AS avail
  19   FROM generate_series(0, pg_relation_size($1) / current_setting('block_size')::bigint - 1) AS blkno;
  20 $$
  21 LANGUAGE SQL;
  22
  23
  24 -- Don't want these to be available to public.
  25 REVOKE ALL ON FUNCTION pg_freespace(regclass, bigint) FROM PUBLIC;
  26 REVOKE ALL ON FUNCTION pg_freespace(regclass) FROM PUBLIC;