Hi All, I have situation here about Innodb locking. In transaction, We select from XYZ transaction table values and then updates it like below
SESSION 1: START TRANSACTION; SELECT ID INTO vID FROM XYZ WHERE FLAG = 1 ORDER BY TIME LIMIT 1 FOR UPDATE; UPDATE XYZ SET FLAG=0 WHERE ID = vID; COMMIT; SESSION 2: UPDATE XYZ SET FLAG=1 WHERE ID = 2; We are keep on getting deadlock due to index locking, there is index on FLAG, we can allow phantom read in session 1, we tried with READ COMMITTED but still same, I think issue with next-key locking. If i do following in SESSION 1 would that help in locking or still it would lock index. Any suggestion. SESSION 1: START TRANSACTION; UPDATE XYZ SET FLAG=0,ID=(@oID:=ID) ORDER BY TIME LIMIT 1; SELECT @oID AS ID; COMMIT;
