set global innodb_lock_wait_timeout=42;
select @@innodb_lock_wait_timeout;
@@innodb_lock_wait_timeout
42
set innodb_lock_wait_timeout=1;
select @@innodb_lock_wait_timeout;
@@innodb_lock_wait_timeout
1
select @@innodb_lock_wait_timeout;
@@innodb_lock_wait_timeout
42
set global innodb_lock_wait_timeout=347;
select @@innodb_lock_wait_timeout;
@@innodb_lock_wait_timeout
42
set innodb_lock_wait_timeout=1;
select @@innodb_lock_wait_timeout;
@@innodb_lock_wait_timeout
1
select @@innodb_lock_wait_timeout;
@@innodb_lock_wait_timeout
347
create table t1(a int primary key)engine=innodb;
begin;
insert into t1 values(1),(2),(3);
set innodb_lock_wait_timeout=5;
select * from t1 for update;
commit;
a
1
2
3
begin;
insert into t1 values(4);
set innodb_lock_wait_timeout=2;
set @a= current_timestamp();
select * from t1 for update;
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
set @b= current_timestamp();
set @c= timestampdiff(SECOND, @a, @b);
select if(@c >= 1 and @c <= 10, 'OK', concat("NOT OK, time passed=", @c));
if(@c >= 1 and @c <= 10, 'OK', concat("NOT OK, time passed=", @c))
OK
commit;
drop table t1;
set global innodb_lock_wait_timeout=50;