问题
Is there a mechanism in MySQL (5.6 or later) to have a transaction (or statement) to volunteer to be a victim in the case it is involved in a deadlock?
With InnoDB deadlock detection on, when a deadlock is identified, InnoDB determines which transaction to kill (to be the victim) in order to allow the other transaction(s) to proceed. There's an algorithm used to determine which transaction is the victim.
My question is whether there is any syntax that we can use in a statement that will influence the algorithm, that basically tells InnoDB "if this statement/transaction is involved in a deadlock, then pick me as the victim."
回答1:
"It is a far, far better thing I do..." — TRX #8675309
The current algorithm for which transaction is killed in case of a deadlock is that the transaction that has changed fewer rows is killed. In case of a tie, the choice is made arbitrarily by InnoDB internal code; we do not know the reason for the choice.
So the only way one transaction can "volunteer" is to change fewer rows than the other transaction.
来源：https://stackoverflow.com/questions/47758614/mysql-innodb-volunteer-transaction-to-be-deadlock-victim