SELECT pg_stat_statements_reset();
 pg_stat_statements_reset 
--------------------------
 
(1 row)

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

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

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

SELECT count(*) FROM pgperf.snapshot_pg_stat_statements;
 count 
-------
     4
(1 row)

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

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

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

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