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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;
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