mysql - auto_increment value increments even if an exception DUPLICATE KEY is thrown or the transaction is Rolled back -


i have table - id auto_increment , email column defined unique.

consider auto_increment set 1.

in stored procedure when insert new row unique email id auto_increment column incremented. correct behavior.

now when try insert same email again unique key violated. check , rollback. auto_increment set 2 now. why?

in third attempt of insert, time unique email row inserted id field has value 3. not good.

is there way can decrement value 2.

check this: mysql auto_increment not rollback

the salient point being: you should never depend on numeric features of autogenerated keys.


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