1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
|
--
-- Information related to planning
--
-- These tests require track_planning to be enabled.
SET pg_stat_statements.track_planning = TRUE;
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
t
---
t
(1 row)
--
-- [re]plan counting
--
CREATE TABLE stats_plan_test ();
PREPARE prep1 AS SELECT COUNT(*) FROM stats_plan_test;
EXECUTE prep1;
count
-------
0
(1 row)
EXECUTE prep1;
count
-------
0
(1 row)
EXECUTE prep1;
count
-------
0
(1 row)
ALTER TABLE stats_plan_test ADD COLUMN x int;
EXECUTE prep1;
count
-------
0
(1 row)
SELECT 42;
?column?
----------
42
(1 row)
SELECT 42;
?column?
----------
42
(1 row)
SELECT 42;
?column?
----------
42
(1 row)
SELECT plans, calls, rows, query FROM pg_stat_statements
WHERE query NOT LIKE 'PREPARE%' ORDER BY query COLLATE "C";
plans | calls | rows | query
-------+-------+------+----------------------------------------------------------
0 | 1 | 0 | ALTER TABLE stats_plan_test ADD COLUMN x int
0 | 1 | 0 | CREATE TABLE stats_plan_test ()
3 | 3 | 3 | SELECT $1
0 | 1 | 1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
1 | 0 | 0 | SELECT plans, calls, rows, query FROM pg_stat_statements+
| | | WHERE query NOT LIKE $1 ORDER BY query COLLATE "C"
(5 rows)
-- for the prepared statement we expect at least one replan, but cache
-- invalidations could force more
SELECT plans >= 2 AND plans <= calls AS plans_ok, calls, rows, query FROM pg_stat_statements
WHERE query LIKE 'PREPARE%' ORDER BY query COLLATE "C";
plans_ok | calls | rows | query
----------+-------+------+-------------------------------------------------------
t | 4 | 4 | PREPARE prep1 AS SELECT COUNT(*) FROM stats_plan_test
(1 row)
-- Cleanup
DROP TABLE stats_plan_test;
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
t
---
t
(1 row)
|
