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

CREATE TABLE t1 ( uid INTEGER PRIMARY KEY, uname TEXT NOT NULL );
CREATE TABLE
INSERT INTO t1 VALUES ( 101, 'Park Gyu-Ri' );
INSERT 0 1
INSERT INTO t1 VALUES ( 102, 'Han Seung-Yeon' );
INSERT 0 1
INSERT INTO t1 VALUES ( 103, 'Nicole' );
INSERT 0 1
INSERT INTO t1 VALUES ( 104, 'Koo Ha-Ra' );
INSERT 0 1
INSERT INTO t1 VALUES ( 105, 'Kang Ji-Young' );
INSERT 0 1
CREATE SEQUENCE s1;
CREATE SEQUENCE
SELECT nextval('s1');
 nextval 
---------
       1
(1 row)

ANALYZE t1;
ANALYZE
ANALYZE s1;
ANALYZE
SELECT pg_sleep(1);
 pg_sleep 
----------
 
(1 row)

SELECT count(*) FROM pgperf.snapshot;
 count 
-------
     0
(1 row)

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

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

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

SELECT pgperf.create_snapshot(1);
 create_snapshot 
-----------------
               0
(1 row)

SELECT count(*) FROM pgperf.snapshot;
 count 
-------
     1
(1 row)

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

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

SELECT count(*) FROM pgperf.snapshot_pg_stat_user_functions WHERE schemaname <> 'pgperf';
 count 
-------
     4
(1 row)

SELECT count(*) FROM pgperf.snapshot_pg_stats WHERE schemaname = 'public';
 count 
-------
     0
(1 row)

SELECT pgperf.create_snapshot(2);
 create_snapshot 
-----------------
               1
(1 row)

SELECT count(*) FROM pgperf.snapshot_pg_stats WHERE schemaname = 'public';
 count 
-------
     2
(1 row)

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

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

SELECT pgperf.create_snapshot(4);
 create_snapshot 
-----------------
               2
(1 row)

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

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

SELECT count(*) FROM pgperf.snapshot;
 count 
-------
     3
(1 row)

SELECT sid,level FROM pgperf.snapshot order by ts;
 sid | level 
-----+-------
   0 |     1
   1 |     2
   2 |     4
(3 rows)

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

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

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

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

SELECT count(*) FROM pgperf.snapshot_pg_stats WHERE schemaname = 'public';
 count 
-------
     0
(1 row)

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

SELECT count(*) FROM pgperf.snapshot;
 count 
-------
     0
(1 row)

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

DROP TABLE t1;
DROP TABLE
DROP SEQUENCE s1;
DROP SEQUENCE
DROP FUNCTION f1();
DROP FUNCTION