mariadb/mysql-test/suite/innodb/t/innodb_defragment.test

--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;