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MySQL 9.4 Reference Manual  / ...  / Replication  / Replication Notes and Tips  / Replication Features and Issues  /  Replication and the Query Optimizer

19.5.1.24 Replication and the Query Optimizer

It is possible for the data on the source and replica to become different if a statement is written in such a way that the data modification is nondeterministic; that is, left up the query optimizer. (In general, this is not a good practice, even outside of replication.) Examples of nondeterministic statements includeDELETE orUPDATE statements that useLIMIT with noORDER BY clause; seeSection 19.5.1.19, “Replication and LIMIT”, for a detailed discussion of these.