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
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
|
CREATE USER user1@localhost;
CREATE USER user2@localhost;
CREATE USER user3@localhost;
grant ALL on *.* to user1@localhost;
grant ALL on *.* to user2@localhost;
grant ALL on *.* to user3@localhost;
TRUNCATE TABLE performance_schema.accounts;
FLUSH PRIVILEGES;
CREATE TABLE test.t_range(a int, b int, PRIMARY KEY(a));
INSERT INTO test.t_range values (1, 1), (2,2), (3, 3), (4, 4), (5, 5);
INSERT INTO test.t_range values (6, 6), (7,7), (8, 8), (9, 9), (10, 10);
FLUSH GLOBAL STATUS;
SELECT * from test.t_range where (a >= 3) AND (a <= 5);
a b
3 3
4 4
5 5
SELECT * from performance_schema.session_status
WHERE VARIABLE_NAME = 'Select_range';
VARIABLE_NAME VARIABLE_VALUE
Select_range 1
VARIABLE_NAME DELTA
Select_range 1
connect con1, localhost, user1,,;
SELECT * from test.t_range where (a >= 3) AND (a <= 5);
a b
3 3
4 4
5 5
SELECT * from performance_schema.session_status
WHERE VARIABLE_NAME = 'Select_range';
VARIABLE_NAME VARIABLE_VALUE
Select_range 1
VARIABLE_NAME DELTA
Select_range 2
connect con2, localhost, user2,,;
SELECT * from test.t_range where (a >= 3) AND (a <= 5);
a b
3 3
4 4
5 5
SELECT * from test.t_range where (a >= 4) AND (a <= 6);
a b
4 4
5 5
6 6
SELECT * from performance_schema.session_status
WHERE VARIABLE_NAME = 'Select_range';
VARIABLE_NAME VARIABLE_VALUE
Select_range 2
VARIABLE_NAME DELTA
Select_range 4
connect con3, localhost, user3,,;
SELECT * from test.t_range where (a >= 3) AND (a <= 5);
a b
3 3
4 4
5 5
SELECT * from test.t_range where (a >= 4) AND (a <= 6);
a b
4 4
5 5
6 6
SELECT * from test.t_range where (a >= 5) AND (a <= 7);
a b
5 5
6 6
7 7
SELECT * from performance_schema.session_status
WHERE VARIABLE_NAME = 'Select_range';
VARIABLE_NAME VARIABLE_VALUE
Select_range 3
VARIABLE_NAME DELTA
Select_range 7
connection default;
VARIABLE_NAME DELTA
Select_range 7
SELECT `USER`, `HOST`, VARIABLE_NAME, VARIABLE_VALUE
FROM performance_schema.status_by_account WHERE VARIABLE_NAME = 'Select_range'
AND `USER` LIKE 'user%'
ORDER BY `USER`;
USER HOST VARIABLE_NAME VARIABLE_VALUE
user1 localhost Select_range 1
user2 localhost Select_range 2
user3 localhost Select_range 3
disconnect con1;
disconnect con2;
VARIABLE_NAME DELTA
Select_range 7
TRUNCATE TABLE performance_schema.accounts;
VARIABLE_NAME DELTA
Select_range 7
disconnect con3;
VARIABLE_NAME DELTA
Select_range 7
TRUNCATE TABLE performance_schema.accounts;
VARIABLE_NAME DELTA
Select_range 7
DROP TABLE test.t_range;
REVOKE ALL PRIVILEGES, GRANT OPTION FROM user1@localhost;
REVOKE ALL PRIVILEGES, GRANT OPTION FROM user2@localhost;
REVOKE ALL PRIVILEGES, GRANT OPTION FROM user3@localhost;
DROP USER user1@localhost;
DROP USER user2@localhost;
DROP USER user3@localhost;
FLUSH PRIVILEGES;
|
