drop table if exists t1;
Warnings:
Note	1051	Unknown table 't1'
create table t1 (id int, index (id)) engine = pbxt;
insert into t1 values (1), (2), (3), (4), (5);
begin;
select * from t1 where id < 5 for update;
id
1
2
3
4
update t1 set id = 8 where id = 5;
update t1 set id = 8 where id = 4;
show processlist;
Id	User	Host	db	Command	Time	State	Info
x	root	x	test	Query	x	NULL	show processlist
x	root	x	test	Query	x	Searching rows for update	update t1 set id = 8 where id = 4
commit;
select * from t1;
id
1
2
3
8
8
drop table if exists t1;
create table t1 (id int) engine = pbxt;
insert into t1 values (1), (2), (3), (4), (5);
begin;
select * from t1 where id > 10 for update;
id
update t1 set id = 8;
commit;
select * from t1;
id
8
8
8
8
8
drop table if exists t1;
create table t1 (id int, index (id)) engine = pbxt;
insert into t1 values (1), (2), (3), (4), (5);
begin;
select * from t1 where id = 5 for update;
id
5
update t1 set id = 8 where id < 4;
update t1 set id = 8 where id = 5;
show processlist;
Id	User	Host	db	Command	Time	State	Info
x	root	x	test	Query	x	NULL	show processlist
x	root	x	test	Query	x	Searching rows for update	update t1 set id = 8 where id = 5
commit;
select * from t1;
id
4
8
8
8
8
drop table if exists t1;
create table t1 (id int, index (id)) engine = pbxt;
insert into t1 values (1), (2), (3), (4), (5);
select * from t1 for update;
id
1
2
3
4
5
update t1 set id = 8;
drop table if exists t1;
create table t1 (id int, index (id)) engine = pbxt;
insert into t1 values (1), (2), (3), (4), (5);
create procedure p1 ()
begin
select * from t1 for update;
end|
call p1 ();
id
1
2
3
4
5
update t1 set id = 8;