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Every time you have perform something atomically you should use transactions. Please understand that (depending on the language/framework/ORM), MySQL may be in auto-commit mode, which means that, functionally speaking, if you are using InnoDB something like this: INSERT INTO innodb_table VALUES (1, 2, 3); gets converted internally into: START ...


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Normally in OLTP databases, transactions are so quick that we need not to place explicit transactions.Though internally MySQL take care of this and place implicit transaction. But if you think your scripts are long and it will take time to execute and if unrealistic/unwanted results can occur if failed in middle then you must apply explicit transactions.



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