MINI MINI MANI MO

set global innodb_file_per_table = 0;
DROP TABLE IF EXISTS t1,t2;
select @@global.innodb_change_buffering;
@@global.innodb_change_buffering
all
create temporary table t1
(keyc int, c1 char(100), c2 char(100),
primary key(keyc)) engine = innodb;
create index idx on t1(keyc, c1(20));
create procedure populate_t1(IN rows INT)
begin
declare i int default 1;
while (i <= rows) DO
insert into t1 values (i, 'a', 'b');
set i = i + 1;
end while;
end|
set autocommit=0;
select count(*) from t1;
count(*)
0
call populate_t1(1000);
select count(*) from t1;
count(*)
1000
select * from t1 limit 10;
keyc	c1	c2
1	a	b
2	a	b
3	a	b
4	a	b
5	a	b
6	a	b
7	a	b
8	a	b
9	a	b
10	a	b
commit;
update t1 set keyc = -1 * keyc where keyc%50 = 0;
select count(*) from t1 where keyc < 0;
count(*)
20
drop table t1;
set @@global.innodb_change_buffering = none ;
select @@global.innodb_change_buffering;
@@global.innodb_change_buffering
none
create temporary table t1
(keyc int, c1 char(100), c2 char(100),
primary key(keyc)) engine = innodb;
create index idx on t1(keyc, c1(20));
set autocommit=0;
select count(*) from t1;
count(*)
0
CALL populate_t1(1000);
select count(*) from t1;
count(*)
1000
select * from t1 limit 10;
keyc	c1	c2
1	a	b
2	a	b
3	a	b
4	a	b
5	a	b
6	a	b
7	a	b
8	a	b
9	a	b
10	a	b
commit;
update t1 set keyc = -1 * keyc where keyc%50 = 0;
select count(*) from t1 where keyc < 0;
count(*)
20
drop table t1;
drop procedure if exists populate_t1;
set global innodb_change_buffering = all;
set global innodb_file_per_table = default;