/usr/lib/mysql-testsuite/r/preload.result is in percona-server-test-5.6 5.6.22-rel71.0-0ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 status Operation failed
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 status Operation failed
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;
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