~drizzle-trunk/drizzle/development

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
drop table if exists t1, t2;
create table t1 (
a int not null auto_increment,
b char(16) not null,
primary key (a),
key (b)
);
create table t2(
a int not null auto_increment,
b char(16) not null,
primary key (a),
key (b)
);
insert into t1(b) values 
('test0'),
('test1'),
('test2'),
('test3'),
('test4'),
('test5'),
('test6'),
('test7');
insert into t2(b) select b from t1;
insert into t1(b) select b from t2;
insert into t2(b) select b from t1;
insert into t1(b) select b from t2;
insert into t2(b) select b from t1;
insert into t1(b) select b from t2;
insert into t2(b) select b from t1;
insert into t1(b) select b from t2;
insert into t2(b) select b from t1;
insert into t1(b) select b from t2;
insert into t2(b) select b from t1;
insert into t1(b) select b from t2;
insert into t2(b) select b from t1;
insert into t1(b) select b from t2;
insert into t2(b) select b from t1;
insert into t1(b) select b from t2;
insert into t2(b) select b from t1;
insert into t1(b) select b from t2;
select count(*) from t1;
count(*)
33448
select count(*) from t2;
count(*)
20672
flush tables;
flush status;
show status like "key_read%";
Variable_name	Value
Key_read_requests	0
Key_reads	0
select count(*) from t1 where b = 'test1';
count(*)
4181
show status like "key_read%";
Variable_name	Value
Key_read_requests	294
Key_reads	60
select count(*) from t1 where b = 'test1';
count(*)
4181
show status like "key_read%";
Variable_name	Value
Key_read_requests	588
Key_reads	60
flush tables;
flush status;
select @@preload_buffer_size;
@@preload_buffer_size
32768
load index into cache t1;
Table	Op	Msg_type	Msg_text
test.t1	preload_keys	status	OK
show status like "key_read%";
Variable_name	Value
Key_read_requests	774
Key_reads	774
select count(*) from t1 where b = 'test1';
count(*)
4181
show status like "key_read%";
Variable_name	Value
Key_read_requests	1068
Key_reads	774
flush tables;
flush status;
show status like "key_read%";
Variable_name	Value
Key_read_requests	0
Key_reads	0
set session preload_buffer_size=256*1024;
select @@preload_buffer_size;
@@preload_buffer_size
262144
load index into cache t1 ignore leaves;
Table	Op	Msg_type	Msg_text
test.t1	preload_keys	status	OK
show status like "key_read%";
Variable_name	Value
Key_read_requests	17
Key_reads	17
select count(*) from t1 where b = 'test1';
count(*)
4181
show status like "key_read%";
Variable_name	Value
Key_read_requests	311
Key_reads	75
flush tables;
flush status;
show status like "key_read%";
Variable_name	Value
Key_read_requests	0
Key_reads	0
set session preload_buffer_size=1*1024;
select @@preload_buffer_size;
@@preload_buffer_size
1024
load index into cache t1, t2 key (primary,b) ignore leaves;
Table	Op	Msg_type	Msg_text
test.t1	preload_keys	status	OK
test.t2	preload_keys	status	OK
show status like "key_read%";
Variable_name	Value
Key_read_requests	785
Key_reads	785
select count(*) from t1 where b = 'test1';
count(*)
4181
select count(*) from t2 where b = 'test1';
count(*)
2584
show status like "key_read%";
Variable_name	Value
Key_read_requests	1266
Key_reads	821
flush tables;
flush status;
show status like "key_read%";
Variable_name	Value
Key_read_requests	0
Key_reads	0
load index into cache t3, t2 key (primary,b) ;
Table	Op	Msg_type	Msg_text
test.t3	preload_keys	Error	Table 'test.t3' doesn't exist
test.t3	preload_keys	error	Corrupt
test.t2	preload_keys	status	OK
show status like "key_read%";
Variable_name	Value
Key_read_requests	478
Key_reads	478
flush tables;
flush status;
show status like "key_read%";
Variable_name	Value
Key_read_requests	0
Key_reads	0
load index into cache t3 key (b), t2 key (c) ;
Table	Op	Msg_type	Msg_text
test.t3	preload_keys	Error	Table 'test.t3' doesn't exist
test.t3	preload_keys	error	Corrupt
test.t2	preload_keys	Error	Key 'c' doesn't exist in table 't2'
test.t2	preload_keys	status	Operation failed
show status like "key_read%";
Variable_name	Value
Key_read_requests	0
Key_reads	0
drop table t1, t2;