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set global innodb_defragment=1;
create table t1 (a int not null primary key auto_increment, b varchar(256), key second(a, b)) engine=innodb;
insert t1 select null, repeat('a', 256) from seq_1_to_100;
select count(*) from t1;
count(*)
100
connect con1,localhost,root;
start transaction;
select count(*) from t1;
count(*)
100
connection default;
optimize table t1;
Table Op Msg_type Msg_text
test.t1 optimize status OK
connection con1;
drop table t1;
set global innodb_defragment=default;
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