Question

I have a procedure of mysql:

START TRANSACTION;

insert into table1(id, name) values(1, 'a'); -- id is a primary key.
...
delete from table1 where id = 1;
COMMIT;

and a multithread call to this procedure will show error in jdbc
Duplicate entry ‘1’ for key table1_UNIQUE_key’

why the other thread will not wait for this thread end?

Answer 1

It is because If you check, you have declared the table as INODB engine, which allows a row level lock, if it had been MYSAM this problem would not occur