Row Level Locking in Mysql

Question

I have 5 rows in a table (1 to 5). I want row 2 lock for some update and in the meanwhile if someone tries to update row 4, then he should able to update.

I am trying th

Answer 1

I found below option is more appropriate i generate 40000 numbers from concurrent session on the same time. I didnt found any duplicate number. Without below command i generate 10000 numbers and found 5 duplicate numbers.

START TRANSACTION

SELECT * FROM test WHERE t=1 FOR UPDATE;

UPDATE test SET NAME='irfandd' WHERE t=2;

COMMIT;