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
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
|
UPDATE performance_schema.setup_instruments SET enabled = 'NO', timed = 'YES';
UPDATE performance_schema.setup_instruments SET enabled = 'YES'
WHERE name in ('wait/io/table/sql/handler',
'wait/lock/table/sql/handler');
drop procedure if exists before_payload;
drop procedure if exists after_payload;
create procedure before_payload()
begin
TRUNCATE TABLE performance_schema.table_io_waits_summary_by_index_usage;
TRUNCATE TABLE performance_schema.table_io_waits_summary_by_table;
TRUNCATE TABLE performance_schema.events_waits_history_long;
TRUNCATE TABLE performance_schema.events_waits_history;
TRUNCATE TABLE performance_schema.events_waits_current;
end
$$
create procedure after_payload()
begin
select count(1) as number_seen,
OBJECT_TYPE, OBJECT_SCHEMA, OBJECT_NAME, INDEX_NAME,
OPERATION, NUMBER_OF_BYTES
from performance_schema.events_waits_history_long
where OBJECT_SCHEMA = "test"
group by OBJECT_TYPE, OBJECT_SCHEMA, OBJECT_NAME, INDEX_NAME, OPERATION, NUMBER_OF_BYTES;
select OBJECT_TYPE, OBJECT_SCHEMA, OBJECT_NAME, INDEX_NAME,
COUNT_STAR, COUNT_READ, COUNT_WRITE
from performance_schema.table_io_waits_summary_by_index_usage
where OBJECT_SCHEMA = "test"
order by OBJECT_TYPE, OBJECT_SCHEMA, OBJECT_NAME, INDEX_NAME;
select OBJECT_TYPE, OBJECT_SCHEMA, OBJECT_NAME,
COUNT_STAR, COUNT_READ, COUNT_WRITE
from performance_schema.table_io_waits_summary_by_table
where OBJECT_SCHEMA = "test"
order by OBJECT_TYPE, OBJECT_SCHEMA, OBJECT_NAME;
end
$$
drop table if exists t1;
drop table if exists t2;
drop table if exists t3;
create table t0(v int);
create table t1(id1 int, a int);
create table t2(id1 int, id2 int, b int);
create table t3(id2 int, id3 int, c int);
insert into t0 values
(0), (1), (2), (3), (4),
(5), (6), (7), (8), (9);
insert into t1(id1, a)
select v, 100*v from t0;
insert into t2(id1, id2, b)
select X.v, 10*X.v + Y.v, 100*X.v + 10*Y.v
from t0 X, t0 Y;
insert into t3(id2, id3, c)
select 10*X.v + Y.v, 100*X.v + 10*Y.v + Z.v, 100*X.v + 10*Y.v + Z.v
from t0 X, t0 Y, t0 Z;
analyze table t1;
Table Op Msg_type Msg_text
test.t1 analyze status Engine-independent statistics collected
test.t1 analyze status OK
analyze table t2;
Table Op Msg_type Msg_text
test.t2 analyze status Engine-independent statistics collected
test.t2 analyze status OK
analyze table t3;
Table Op Msg_type Msg_text
test.t3 analyze status Engine-independent statistics collected
test.t3 analyze status OK
select * from t1 order by a;
id1 a
0 0
1 100
2 200
3 300
4 400
5 500
6 600
7 700
8 800
9 900
select * from t2
where (b >= 180) and (b <= 220)
order by b;
id1 id2 b
1 18 180
1 19 190
2 20 200
2 21 210
2 22 220
select * from t3
where (c >= 587) and (c <= 612)
order by c;
id2 id3 c
58 587 587
58 588 588
58 589 589
59 590 590
59 591 591
59 592 592
59 593 593
59 594 594
59 595 595
59 596 596
59 597 597
59 598 598
59 599 599
60 600 600
60 601 601
60 602 602
60 603 603
60 604 604
60 605 605
60 606 606
60 607 607
60 608 608
60 609 609
61 610 610
61 611 611
61 612 612
explain extended select t1.*, t2.*, t3.*
from t1 join t2 using (id1) join t3 using (id2);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 10 100.00
1 SIMPLE t2 ALL NULL NULL NULL NULL 100 100.00 Using where; Using join buffer (flat, BNL join)
1 SIMPLE t3 ALL NULL NULL NULL NULL 1000 100.00 Using where; Using join buffer (incremental, BNL join)
Warnings:
Note 1003 select `test`.`t1`.`id1` AS `id1`,`test`.`t1`.`a` AS `a`,`test`.`t2`.`id1` AS `id1`,`test`.`t2`.`id2` AS `id2`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`id2` AS `id2`,`test`.`t3`.`id3` AS `id3`,`test`.`t3`.`c` AS `c` from `test`.`t1` join `test`.`t2` join `test`.`t3` where `test`.`t3`.`id2` = `test`.`t2`.`id2` and `test`.`t2`.`id1` = `test`.`t1`.`id1`
call before_payload();
select t1.*, t2.*, t3.*
from t1 join t2 using (id1) join t3 using (id2);
call after_payload();
number_seen OBJECT_TYPE OBJECT_SCHEMA OBJECT_NAME INDEX_NAME OPERATION NUMBER_OF_BYTES
11 TABLE test t1 NULL fetch 1
1 TABLE test t1 NULL read external NULL
1 TABLE test t1 NULL read normal NULL
101 TABLE test t2 NULL fetch 1
1 TABLE test t2 NULL read external NULL
1 TABLE test t2 NULL read normal NULL
1 TABLE test t3 NULL fetch 1000
1 TABLE test t3 NULL read external NULL
1 TABLE test t3 NULL read normal NULL
OBJECT_TYPE OBJECT_SCHEMA OBJECT_NAME INDEX_NAME COUNT_STAR COUNT_READ COUNT_WRITE
TABLE test t0 NULL 0 0 0
TABLE test t1 NULL 11 11 0
TABLE test t2 NULL 101 101 0
TABLE test t3 NULL 1000 1000 0
OBJECT_TYPE OBJECT_SCHEMA OBJECT_NAME COUNT_STAR COUNT_READ COUNT_WRITE
TABLE test t0 0 0 0
TABLE test t1 11 11 0
TABLE test t2 101 101 0
TABLE test t3 1000 1000 0
alter table t1 add unique index(id1);
alter table t2 add unique index(id2);
alter table t2 add index(id1);
alter table t3 add unique index(id3);
alter table t3 add index(id2);
explain extended select t1.*, t2.*, t3.*
from t1 join t2 using (id1) join t3 using (id2);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 ALL id1 NULL NULL NULL 10 100.00
1 SIMPLE t2 ALL id2,id1 NULL NULL NULL 100 10.00 Using where; Using join buffer (flat, BNL join)
1 SIMPLE t3 ref id2 id2 5 test.t2.id2 10 100.00
Warnings:
Note 1003 select `test`.`t1`.`id1` AS `id1`,`test`.`t1`.`a` AS `a`,`test`.`t2`.`id1` AS `id1`,`test`.`t2`.`id2` AS `id2`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`id2` AS `id2`,`test`.`t3`.`id3` AS `id3`,`test`.`t3`.`c` AS `c` from `test`.`t1` join `test`.`t2` join `test`.`t3` where `test`.`t3`.`id2` = `test`.`t2`.`id2` and `test`.`t2`.`id1` = `test`.`t1`.`id1`
call before_payload();
select t1.*, t2.*, t3.*
from t1 join t2 using (id1) join t3 using (id2);
call after_payload();
number_seen OBJECT_TYPE OBJECT_SCHEMA OBJECT_NAME INDEX_NAME OPERATION NUMBER_OF_BYTES
11 TABLE test t1 NULL fetch 1
1 TABLE test t1 id1 read external NULL
1 TABLE test t1 id1 read normal NULL
101 TABLE test t2 NULL fetch 1
1 TABLE test t2 id2 read external NULL
1 TABLE test t2 id2 read normal NULL
100 TABLE test t3 id2 fetch 10
1 TABLE test t3 id3 read external NULL
1 TABLE test t3 id3 read normal NULL
OBJECT_TYPE OBJECT_SCHEMA OBJECT_NAME INDEX_NAME COUNT_STAR COUNT_READ COUNT_WRITE
TABLE test t0 NULL 0 0 0
TABLE test t1 NULL 11 11 0
TABLE test t1 id1 0 0 0
TABLE test t2 NULL 101 101 0
TABLE test t2 id1 0 0 0
TABLE test t2 id2 0 0 0
TABLE test t3 id2 1000 1000 0
TABLE test t3 id3 0 0 0
OBJECT_TYPE OBJECT_SCHEMA OBJECT_NAME COUNT_STAR COUNT_READ COUNT_WRITE
TABLE test t0 0 0 0
TABLE test t1 11 11 0
TABLE test t2 101 101 0
TABLE test t3 1000 1000 0
drop table t0;
drop table t1;
drop table t2;
drop table t3;
drop procedure before_payload;
drop procedure after_payload;
UPDATE performance_schema.setup_instruments SET enabled = 'YES', timed = 'YES';
|
