1create table t1(a blob) engine=innodb key_block_size=8;
2create function generate_blob()
3returns varchar(20000)
4begin
5declare x varchar(20000) default '';
6declare i int default 500;
7while i > 0 do
8set x = concat(sha1(i), x);
9set i = i - 1;
10end while;
11return x;
12end //
13insert into t1 select generate_blob();
14truncate t1;
15insert into t1 select generate_blob();
16drop table t1;
17drop function generate_blob;
18