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
|
-- source ../include/ps_truncate_all_tables.inc
# Performance schema tracks prepared statements separately, and does not
# yet have a summary view that we can use for this view.
# Until then, we disable this test with --ps-protocol
# Test requires: sp-protocol/ps-protocol/view-protocol/cursor-protocol disabled
-- source include/no_protocol.inc
# Tests for sys schema
# Verify the sys.statements_with_full_table_scans view
# Ensure structure changes don't slip in
DESC sys.statements_with_full_table_scans;
# Make sure view select does not error, but ignore results
--disable_result_log
SELECT * FROM sys.statements_with_full_table_scans;
--enable_result_log
# Ensure structure changes don't slip in
DESC sys.x$statements_with_full_table_scans;
# Make sure view select does not error, but ignore results
--disable_result_log
SELECT * FROM sys.x$statements_with_full_table_scans;
--enable_result_log
# Create a dummy table, force some full table scans, verify the results
CREATE DATABASE v_statements_with_full_table_scans;
CREATE TABLE v_statements_with_full_table_scans.t (i BIGINT AUTO_INCREMENT PRIMARY KEY, j BIGINT) ENGINE = innodb;
INSERT INTO v_statements_with_full_table_scans.t (j) VALUES (1), (2), (3);
INSERT INTO v_statements_with_full_table_scans.t (j) (SELECT j*2 FROM v_statements_with_full_table_scans.t);
INSERT INTO v_statements_with_full_table_scans.t (j) (SELECT j*2 FROM v_statements_with_full_table_scans.t);
INSERT INTO v_statements_with_full_table_scans.t (j) (SELECT j*2 FROM v_statements_with_full_table_scans.t);
INSERT INTO v_statements_with_full_table_scans.t (j) (SELECT j*2 FROM v_statements_with_full_table_scans.t);
INSERT INTO v_statements_with_full_table_scans.t (j) (SELECT j*2 FROM v_statements_with_full_table_scans.t);
INSERT INTO v_statements_with_full_table_scans.t (j) (SELECT j*2 FROM v_statements_with_full_table_scans.t);
INSERT INTO v_statements_with_full_table_scans.t (j) (SELECT j*2 FROM v_statements_with_full_table_scans.t);
INSERT INTO v_statements_with_full_table_scans.t (j) (SELECT j*2 FROM v_statements_with_full_table_scans.t);
# The table should now have 768 rows
# Now truncate the P_S tables, to get fresh results
CALL sys.ps_truncate_all_tables(false);
# Following returns 28 rows, but should full scan as j has no index
# Using RAND() to force no query caching, so ignore results, they are not important
--disable_result_log
SELECT i, j, RAND() FROM v_statements_with_full_table_scans.t WHERE j = 12;
--enable_result_log
# Now verify the statement shows up in the views with the right row count (should be 768)
SELECT db, query, rows_examined FROM sys.statements_with_full_table_scans WHERE query LIKE '%v_statements_with_full_table_scans%' ORDER BY rows_examined DESC;
SELECT db, query, rows_examined FROM sys.x$statements_with_full_table_scans WHERE query LIKE '%v_statements_with_full_table_scans%' ORDER BY rows_examined DESC;
# Scan again
--disable_result_log
SELECT i, j, RAND() FROM v_statements_with_full_table_scans.t WHERE j = 12;
--enable_result_log
# Now verify that double the amount of rows for the statement should be shown as scanned (should be 1536)
SELECT db, query, rows_examined FROM sys.statements_with_full_table_scans WHERE query LIKE '%v_statements_with_full_table_scans%' ORDER BY rows_examined DESC;
SELECT db, query, rows_examined FROM sys.x$statements_with_full_table_scans WHERE query LIKE '%v_statements_with_full_table_scans%' ORDER BY rows_examined DESC;
# Do a point lookup
--skip_if_hypergraph # Does not support indexes yet, so it would show up in the list.
SELECT * FROM v_statements_with_full_table_scans.t WHERE i = 10;
# The number of rows scanned should not have changed (should still be 1536)
SELECT db, query, rows_examined FROM sys.statements_with_full_table_scans WHERE query LIKE '%v_statements_with_full_table_scans%' ORDER BY rows_examined DESC;
SELECT db, query, rows_examined FROM sys.x$statements_with_full_table_scans WHERE query LIKE '%v_statements_with_full_table_scans%' ORDER BY rows_examined DESC;
# Cleanup
DROP DATABASE v_statements_with_full_table_scans;
|
