CREATE FUNCTION f1() RETURNS BOOLEAN
 AS
'
BEGIN
   RETURN true;
END
' LANGUAGE 'plpgsql';
CREATE FUNCTION
SELECT f1();
 f1 
----
 t
(1 row)

SELECT pg_sleep(1);
 pg_sleep 
----------
 
(1 row)

SELECT pgperf.create_snapshot_pg_stat_user_functions(0);
 create_snapshot_pg_stat_user_functions 
----------------------------------------
 t
(1 row)

SELECT count(*) FROM pgperf.snapshot_pg_stat_user_functions WHERE schemaname <> 'pgperf';
 count 
-------
     3
(1 row)

SELECT pgperf.create_snapshot_pg_stat_user_functions(1);
 create_snapshot_pg_stat_user_functions 
----------------------------------------
 t
(1 row)

SELECT count(*) FROM pgperf.snapshot_pg_stat_user_functions WHERE schemaname <> 'pgperf';
 count 
-------
     6
(1 row)

SELECT pgperf.create_snapshot_pg_stat_user_functions(2);
 create_snapshot_pg_stat_user_functions 
----------------------------------------
 t
(1 row)

SELECT count(*) FROM pgperf.snapshot_pg_stat_user_functions WHERE schemaname <> 'pgperf';
 count 
-------
     9
(1 row)

SELECT pgperf.delete_snapshot_pg_stat_user_functions(1);
 delete_snapshot_pg_stat_user_functions 
----------------------------------------
 t
(1 row)

SELECT count(*) FROM pgperf.snapshot_pg_stat_user_functions WHERE schemaname <> 'pgperf';
 count 
-------
     6
(1 row)

SELECT pgperf.delete_snapshot_pg_stat_user_functions(2);
 delete_snapshot_pg_stat_user_functions 
----------------------------------------
 t
(1 row)

SELECT count(*) FROM pgperf.snapshot_pg_stat_user_functions WHERE schemaname <> 'pgperf';
 count 
-------
     3
(1 row)

SELECT pgperf.delete_snapshot_pg_stat_user_functions(0);
 delete_snapshot_pg_stat_user_functions 
----------------------------------------
 t
(1 row)

SELECT count(*) FROM pgperf.snapshot_pg_stat_user_functions WHERE schemaname <> 'pgperf';
 count 
-------
     0
(1 row)

DROP FUNCTION f1();
DROP FUNCTION