mariadb/mysql-test/suite/maria/t/maria-preload.test

#
# Testing of PRELOAD
#

-- source include/have_maria.inc

--disable_warnings
drop table if exists t1, t2;
--enable_warnings

# Background dirty pages flushing may influence page cache stats:
let $def_checkinterval=`select @@global.maria_checkpoint_interval`;
set global maria_checkpoint_interval=0;

# Work around BUG#34911 "FLUSH STATUS doesn't flush what it should":
# compute differences in status variables before and after relevant
# queries. Maria_pagecache_read_requests varies accross machines.
create temporary table initial
select variable_name,variable_value from
information_schema.global_status where variable_name like "Maria_pagecache_reads";

# we don't use block-format because we want page cache stats
# about indices and not data pages.

create table t1 (
  a int not null auto_increment,
  b char(16) not null,
  primary key (a),
  key (b)
) engine=maria row_format=dynamic;

create table t2(
  a int not null auto_increment,
  b char(16) not null,
  primary key (a),
  key (b)
) engine=maria row_format=dynamic;

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;
let $show_stat=select g.variable_name,g.variable_value-i.variable_value from information_schema.global_status as g,initial as i where g.variable_name like "Maria_pagecache_read%" and g.variable_name=i.variable_name order by g.variable_name desc;
eval $show_stat;
select count(*) from t1 where b = 'test1';
eval $show_stat;
select count(*) from t1 where b = 'test1';
eval $show_stat;

flush tables; flush status;
select @@preload_buffer_size;
load index into cache t1;
eval $show_stat;
select count(*) from t1 where b = 'test1';
eval $show_stat;

flush tables; flush status;
eval $show_stat;
set session preload_buffer_size=256*1024;
select @@preload_buffer_size;
load index into cache t1 ignore leaves;
eval $show_stat;
select count(*) from t1 where b = 'test1';
eval $show_stat;

flush tables; flush status; 
eval $show_stat;
set session preload_buffer_size=1*1024;
select @@preload_buffer_size;
load index into cache t1, t2 key (primary,b) ignore leaves;
eval $show_stat;
select count(*) from t1 where b = 'test1';
select count(*) from t2 where b = 'test1';
eval $show_stat;

flush tables; flush status;
eval $show_stat;
load index into cache t3, t2 key (primary,b) ;
eval $show_stat;
flush tables; flush status;
eval $show_stat;
load index into cache t3 key (b), t2 key (c) ;
eval $show_stat;

drop table t1, t2;
drop temporary table initial;

# check that Maria didn't use key cache
show status like "key_read%";

--disable_result_log
--disable_query_log
eval set global maria_checkpoint_interval=$def_checkinterval;
--enable_result_log
--enable_query_log