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MySQL 5.6 Reference Manual
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MySQL 5.6 Reference Manual  /  ...  /  Replication and the Query Optimizer Replication and the Query Optimizer

It is possible for the data on the master and slave 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 include DELETE or UPDATE statements that use LIMIT with no ORDER BY clause; see Section, “Replication and LIMIT”, for a detailed discussion of these.

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