/usr/lib/mysql-testsuite/t/preload.test is in mysql-testsuite-5.6 5.6.16-1~exp1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Testing of PRELOAD
#
--disable_warnings
drop table if exists t1, t2;
--enable_warnings
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;
select count(*) from t2;
flush tables; flush status;
show status like "key_read%";
select count(*) from t1 where b = 'test1';
show status like "key_read%";
select count(*) from t1 where b = 'test1';
show status like "key_read%";
flush tables; flush status;
select @@preload_buffer_size;
load index into cache t1;
show status like "key_read%";
select count(*) from t1 where b = 'test1';
show status like "key_read%";
flush tables; flush status;
show status like "key_read%";
set session preload_buffer_size=256*1024;
select @@preload_buffer_size;
load index into cache t1 ignore leaves;
show status like "key_read%";
select count(*) from t1 where b = 'test1';
show status like "key_read%";
flush tables; flush status;
show status like "key_read%";
set session preload_buffer_size=1*1024;
select @@preload_buffer_size;
load index into cache t1, t2 key (primary,b) ignore leaves;
show status like "key_read%";
select count(*) from t1 where b = 'test1';
select count(*) from t2 where b = 'test1';
show status like "key_read%";
flush tables; flush status;
show status like "key_read%";
load index into cache t3, t2 key (primary,b) ;
show status like "key_read%";
flush tables; flush status;
show status like "key_read%";
load index into cache t3 key (b), t2 key (c) ;
show status like "key_read%";
drop table t1, t2;
# End of 4.1 tests
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