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
|
UPDATE performance_schema.setup_instruments SET enabled = 'NO', timed = 'YES';
UPDATE performance_schema.setup_instruments SET enabled = 'YES'
WHERE name LIKE 'wait/synch/mutex/%'
OR name LIKE 'wait/synch/rwlock/%';
truncate table performance_schema.events_statements_summary_by_digest;
flush global status;
select NAME from performance_schema.mutex_instances
where NAME = 'wait/synch/mutex/mysys/THR_LOCK::mutex' GROUP BY NAME;
NAME
wait/synch/mutex/mysys/THR_LOCK::mutex
select NAME from performance_schema.rwlock_instances
where NAME = 'wait/synch/rwlock/sql/LOCK_grant' limit 1;
NAME
wait/synch/rwlock/sql/LOCK_grant
DROP TABLE IF EXISTS t1;
CREATE TABLE t1 (id INT PRIMARY KEY, b CHAR(100) DEFAULT 'initial value')
ENGINE=MyISAM;
INSERT INTO t1 (id) VALUES (1), (2), (3), (4), (5), (6), (7), (8);
TRUNCATE TABLE performance_schema.events_waits_history_long;
TRUNCATE TABLE performance_schema.events_waits_history;
TRUNCATE TABLE performance_schema.events_waits_current;
SELECT * FROM t1 WHERE id = 1;
id b
1 initial value
SET @before_count = (SELECT SUM(TIMER_WAIT)
FROM performance_schema.events_waits_history_long
WHERE (EVENT_NAME = 'wait/synch/mutex/mysys/THR_LOCK::mutex'));
SELECT * FROM t1;
id b
1 initial value
2 initial value
3 initial value
4 initial value
5 initial value
6 initial value
7 initial value
8 initial value
SET @after_count = (SELECT SUM(TIMER_WAIT)
FROM performance_schema.events_waits_history_long
WHERE (EVENT_NAME = 'wait/synch/mutex/mysys/THR_LOCK::mutex'));
SELECT IF((@after_count - @before_count) > 0, 'Success', 'Failure') test_fm1_timed;
test_fm1_timed
Success
UPDATE performance_schema.setup_instruments SET enabled = 'NO'
WHERE NAME = 'wait/synch/mutex/mysys/THR_LOCK::mutex';
TRUNCATE TABLE performance_schema.events_waits_history_long;
TRUNCATE TABLE performance_schema.events_waits_history;
TRUNCATE TABLE performance_schema.events_waits_current;
SELECT * FROM t1 WHERE id = 1;
id b
1 initial value
SET @before_count = (SELECT SUM(TIMER_WAIT)
FROM performance_schema.events_waits_history_long
WHERE (EVENT_NAME = 'wait/synch/mutex/mysys/THR_LOCK::mutex'));
SELECT * FROM t1;
id b
1 initial value
2 initial value
3 initial value
4 initial value
5 initial value
6 initial value
7 initial value
8 initial value
SET @after_count = (SELECT SUM(TIMER_WAIT)
FROM performance_schema.events_waits_history_long
WHERE (EVENT_NAME = 'wait/synch/mutex/mysys/THR_LOCK::mutex'));
SELECT IF((COALESCE(@after_count, 0) - COALESCE(@before_count, 0)) = 0, 'Success', 'Failure') test_fm2_timed;
test_fm2_timed
Success
TRUNCATE TABLE performance_schema.events_waits_history_long;
TRUNCATE TABLE performance_schema.events_waits_history;
TRUNCATE TABLE performance_schema.events_waits_current;
show variables like "%not_found%";
Variable_name Value
SET @before_count = (SELECT SUM(TIMER_WAIT)
FROM performance_schema.events_waits_history_long
WHERE (EVENT_NAME = 'wait/synch/rwlock/sql/LOCK_system_variables_hash'));
show variables like "%not_found%";
Variable_name Value
SET @after_count = (SELECT SUM(TIMER_WAIT)
FROM performance_schema.events_waits_history_long
WHERE (EVENT_NAME = 'wait/synch/rwlock/sql/LOCK_system_variables_hash'));
SELECT IF((@after_count - @before_count) > 0, 'Success', 'Failure') test_fm1_rw_timed;
test_fm1_rw_timed
Success
UPDATE performance_schema.setup_instruments SET enabled = 'NO'
WHERE NAME = 'wait/synch/rwlock/sql/LOCK_system_variables_hash';
TRUNCATE TABLE performance_schema.events_waits_history_long;
TRUNCATE TABLE performance_schema.events_waits_history;
TRUNCATE TABLE performance_schema.events_waits_current;
show variables like "%not_found%";
Variable_name Value
SET @before_count = (SELECT SUM(TIMER_WAIT)
FROM performance_schema.events_waits_history_long
WHERE (EVENT_NAME = 'wait/synch/rwlock/sql/LOCK_system_variables_hash'));
show variables like "%not_found%";
Variable_name Value
SET @after_count = (SELECT SUM(TIMER_WAIT)
FROM performance_schema.events_waits_history_long
WHERE (EVENT_NAME = 'LOCK_system_variables_hash'));
SELECT IF((COALESCE(@after_count, 0) - COALESCE(@before_count, 0)) = 0, 'Success', 'Failure') test_fm2_rw_timed;
test_fm2_rw_timed
Success
UPDATE performance_schema.setup_instruments SET enabled = 'YES';
DROP TABLE t1;
UPDATE performance_schema.setup_instruments SET enabled = 'YES', timed = 'YES';
show global status like "performance_schema%";
Variable_name Value
Performance_schema_accounts_lost 0
Performance_schema_cond_classes_lost 0
Performance_schema_cond_instances_lost 0
Performance_schema_digest_lost 0
Performance_schema_file_classes_lost 0
Performance_schema_file_handles_lost 0
Performance_schema_file_instances_lost 0
Performance_schema_hosts_lost 0
Performance_schema_index_stat_lost 0
Performance_schema_locker_lost 0
Performance_schema_memory_classes_lost 0
Performance_schema_metadata_lock_lost 0
Performance_schema_mutex_classes_lost 0
Performance_schema_mutex_instances_lost 0
Performance_schema_nested_statement_lost 0
Performance_schema_prepared_statements_lost 0
Performance_schema_program_lost 0
Performance_schema_rwlock_classes_lost 0
Performance_schema_rwlock_instances_lost 0
Performance_schema_session_connect_attrs_lost 0
Performance_schema_socket_classes_lost 0
Performance_schema_socket_instances_lost 0
Performance_schema_stage_classes_lost 0
Performance_schema_statement_classes_lost 0
Performance_schema_table_handles_lost 0
Performance_schema_table_instances_lost 0
Performance_schema_table_lock_stat_lost 0
Performance_schema_thread_classes_lost 0
Performance_schema_thread_instances_lost 0
Performance_schema_users_lost 0
|
