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
|
--source include/have_innodb.inc
--source include/big_test.inc
--source include/not_embedded.inc
set global innodb_defragment_stats_accuracy = 80;
# Create table.
CREATE TABLE t1 (a INT NOT NULL PRIMARY KEY AUTO_INCREMENT, b VARCHAR(256), KEY SECOND(a, b)) ENGINE=INNODB;
## Test-1 defragment an empty table
optimize table t1;
## Test-2 defragment a single page table
INSERT INTO t1 VALUES (100000, REPEAT('A', 256));
INSERT INTO t1 VALUES (200000, REPEAT('A', 256));
INSERT INTO t1 VALUES (300000, REPEAT('A', 256));
INSERT INTO t1 VALUES (400000, REPEAT('A', 256));
optimize table t1;
## Test-3 defragment (somewhat) in parallel with delete queries
let $data_size = 10000;
let $delete_size = 100;
delimiter //;
create procedure defragment()
begin
set @i = 0;
repeat
set @i = @i + 1;
optimize table t1;
until @i = 3 end repeat;
end //
delimiter ;//
# Populate table.
let $i = $data_size;
--disable_query_log
BEGIN;
while ($i)
{
eval
INSERT INTO t1 VALUES ($data_size + 1 - $i, REPEAT('A', 256));
dec $i;
}
COMMIT;
--enable_query_log
select count(stat_value) from mysql.innodb_index_stats where table_name like '%t1%' and stat_name in ('n_pages_freed');
select count(stat_value) from mysql.innodb_index_stats where table_name like '%t1%' and stat_name in ('n_page_split');
select count(stat_value) from mysql.innodb_index_stats where table_name like '%t1%' and stat_name in ('n_leaf_pages_defrag');
select count(*) from t1;
connect (con1,localhost,root,,test,$MASTER_MYPORT,$MASTER_MYSOCK);
connection con1;
--send call defragment()
connection default;
--disable_query_log
let $size = $delete_size;
while ($size)
{
let $j = 100 * $size;
eval delete from t1 where a between $j - 20 and $j;
dec $size;
}
--enable_query_log
connection con1;
--disable_result_log
--reap
--enable_result_log
connection default;
disconnect con1;
optimize table t1;
--source include/restart_mysqld.inc
select count(*) from t1;
select count(stat_value) = 0 from mysql.innodb_index_stats where table_name like '%t1%' and stat_name in ('n_pages_freed');
select count(stat_value) > 0 from mysql.innodb_index_stats where table_name like '%t1%' and stat_name in ('n_page_split');
select count(stat_value) > 0 from mysql.innodb_index_stats where table_name like '%t1%' and stat_name in ('n_leaf_pages_defrag');
select count(*) from t1 force index (second);
select count(stat_value) = 0 from mysql.innodb_index_stats where table_name like '%t1%' and index_name = 'second' and stat_name in ('n_pages_freed');
select count(stat_value) = 0 from mysql.innodb_index_stats where table_name like '%t1%' and index_name = 'second' and stat_name in ('n_page_split');
select count(stat_value) = 0 from mysql.innodb_index_stats where table_name like '%t1%' and index_name = 'second' and stat_name in ('n_leaf_pages_defrag');
## Test-4 defragment with larger n_pages
# delete some more records
--disable_query_log
let $size = $delete_size;
while ($size)
{
let $j = 100 * $size;
eval delete from t1 where a between $j - 30 and $j - 20;
dec $size;
}
--enable_query_log
SET @@global.innodb_defragment_n_pages = 3;
# This will not reduce number of pages by a lot
optimize table t1;
--source include/restart_mysqld.inc
select count(stat_value) < 3 from mysql.innodb_index_stats where table_name like '%t1%' and stat_name in ('n_pages_freed');
select count(stat_value) < 3 from mysql.innodb_index_stats where table_name like '%t1%' and stat_name in ('n_page_split');
select count(stat_value) < 3 from mysql.innodb_index_stats where table_name like '%t1%' and stat_name in ('n_leaf_pages_defrag');
select count(*) from t1;
# We didn't create large wholes with the previous deletion, so if innodb_defragment_n_pages = 3, we won't be able to free up many pages.
select count(stat_value) < 3 from mysql.innodb_index_stats where table_name like '%t1%' and stat_name in ('n_pages_freed');
select count(stat_value) < 3 from mysql.innodb_index_stats where table_name like '%t1%' and stat_name in ('n_page_split');
select count(stat_value) < 3 from mysql.innodb_index_stats where table_name like '%t1%' and stat_name in ('n_leaf_pages_defrag');
select count(*) from t1 force index (second);
# Same holds for secondary index, not many pages are released.
select count(stat_value) = 0 from mysql.innodb_index_stats where table_name like '%t1%' and index_name = 'second' and stat_name in ('n_pages_freed');
select count(stat_value) = 0 from mysql.innodb_index_stats where table_name like '%t1%' and index_name = 'second' and stat_name in ('n_page_split');
select count(stat_value) = 0 from mysql.innodb_index_stats where table_name like '%t1%' and index_name = 'second' and stat_name in ('n_leaf_pages_defrag');
SET @@global.innodb_defragment_n_pages = 10;
optimize table t1;
--source include/restart_mysqld.inc
select count(stat_value) > 1 from mysql.innodb_index_stats where table_name like '%t1%' and stat_name in ('n_pages_freed');
select count(stat_value) > 1 from mysql.innodb_index_stats where table_name like '%t1%' and stat_name in ('n_page_split');
select count(stat_value) > 1 from mysql.innodb_index_stats where table_name like '%t1%' and stat_name in ('n_leaf_pages_defrag');
select count(*) from t1 force index (second);
# Same holds for secondary index, not many pages are released.
select count(stat_value) = 0 from mysql.innodb_index_stats where table_name like '%t1%' and index_name = 'second' and stat_name in ('n_pages_freed');
select count(stat_value) = 0 from mysql.innodb_index_stats where table_name like '%t1%' and index_name = 'second' and stat_name in ('n_page_split');
select count(stat_value) = 0 from mysql.innodb_index_stats where table_name like '%t1%' and index_name = 'second' and stat_name in ('n_leaf_pages_defrag');
DROP PROCEDURE defragment;
DROP TABLE t1;
|
